USRE31136E - Herbicidal 5-pyrimidinecarbonitriles - Google Patents

Herbicidal 5-pyrimidinecarbonitriles Download PDF

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USRE31136E
USRE31136E US06/176,615 US17661580A USRE31136E US RE31136 E USRE31136 E US RE31136E US 17661580 A US17661580 A US 17661580A US RE31136 E USRE31136 E US RE31136E
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pyrimidinecarbonitrile
cyano
methoxy
isopropylamino
methylethylamino
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Gino R. Treves
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FMC Corp
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
    • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
    • C07D239/32—One oxygen, sulfur or nitrogen atom
    • C07D239/42—One nitrogen atom
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/48—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with two nitrogen atoms as the only ring hetero atoms
    • A01N43/54—1,3-Diazines; Hydrogenated 1,3-diazines
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
    • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
    • C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
    • C07D239/48—Two nitrogen atoms

Definitions

  • Heterocyclic organic compounds are among the newer classes of herbicides.
  • the six-member s-triazine ring system is the central structural feature in a number of commercial herbicides, including 2-t-butylamino-4-ethylamino-6-methoxy-s-triazine [Martin and Worthing, "Pesticide Manual," 4th Ed., British Crop Protection Council, Worcester, England, 1974, p. 477], 2-sec-butylamino-4-ethylamino-6-methoxy-s-triazine [ibid., p. 449], 2-chloro-4-cyclopropylamino-6-isopropylamino-s-triazine [ibid., p.
  • the six member 1,3-diazine (pyrimidine) ring system is less common among the known herbicides, but some 4,6-disubstituted and 2,4,6-trisubstituted 5-nitropyrimidines display herbicidal activity [Ger. Offen. 2,520,381] as do certain 2,6-diamino-5-pyrimidinecarboxamides [U.S. Pat. No. 3,845,055].
  • 5-pyrimidinecarbonitriles having amino substituents in the 2 and 6 positions and an alkoxy substituent in the 4 position, are extremely effective herbicides, which control the growth of a range of grassy and broad-leaved weeds while not affecting desirable crops such as corn and cotton growing therewith.
  • One advantage of the 2,4,6-trisubstituted 5-pyrimidinecarbonitriles of this invention is that many of them are effective at very low rates of application.
  • novel active 5-pyrimidinecarbonitriles of this invention and the novel compounds useful as intermediates thereto are represented collectively by the following structural formula: ##STR1## wherein R 2 is a radical selected from amino, lower alkylamino, lower cycloalkylamino, di(lower alkyl)amino, [alpha-cyano(lower alkyl)]amino, and halogen; R 4 is a radical selected from lower alkoxy, and halogen; and R 6 is a radical selected from amino, lower alkylamino, lower cycloalkylamino, di(lower alkyl)amino, and halogen; with the proviso that no more than two of R 2 , R 4 and R 6 are halogen; and provided further that neither R 2 nor R 6 is tert-butylamino; and when R 2 is isopropylamino, R 6 is other than n-butylamino; and when R 2 is methylethylamino, R 6
  • novel intermediates and the novel active 5-pyrimidinecarbonitriles prepared therefrom can be obtained conveniently from a 2,4,6-trihalo-5-pyrimidinecarbonitrile.
  • 2,4,6-Trichloro-5-pyrimidinecarbonitrile is available from barbituric acid and urea via 2,4,6-trihydroxy-5-pyrimidinecarboxamide [Scarborough and Gould, J. Org. Chem., 26, 3720 (1961); U.S. Pat. No. 3,097,910].
  • Alpha-aminonitriles are employed in preparing 5-pyrimidinecarbonitriles containing an [alphacyano(lower-alkyl)]amino group in the R 2 position.
  • Alpha-aminonitriles may be prepared by the Strecker synthesis [Freifelder and Hasbrouck, J. Amer. Chem. Soc., 82, 696 (1960)].
  • novel intermediates of this invention contain at least one, but no more than two, halogen atoms, preferably chlorine. They are obtained by the displacement of one or two of the halogen atoms of a 2,4,6-trihalo-5-pyrimidinecarbonitrile.
  • especially useful intermediates comprise 4,6-dichloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile, 4,6-dichloro-2-isopropylamino-5-pyrimidinecarbonitrile and 4,6-dichloro-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile; whereas among the latter, 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile, 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile, 4-chloro-2-(1-cyano-1-methylethylamino)-6-cyclopropylamino-5-pyrimidinecarbonitrile, 4-chloro-6-cyclopropylamino-2-isopropylamino-5-pyrimidinecarbonitrile, and 4-chloro-6-(1-
  • R 2 is a radical selected from amino, lower alkylamino, lower cycloalkylamino, di(lower alkyl)amino, and [alpha-cyano(lower alkyl)]amino
  • R 4 is a lower alkoxy radical
  • R 6 is a radical selected from amino, lower alkylamino, lower cycloalkylamino, and di(lower alkyl)amino; with the proviso that neither R 2 nor R 6 is tert-butylamino; and provided further that when R 2 is isopropylamino, R 6 is other than n-butylamino; and when R 2 is methylethylamino, R 6 is other than isopropylamino; and when R 2 is diethylamino, R 6 is other than
  • R 2 is selected from lower alkylamino (except tert-butylamino) and [alpha-cyano-(lower alkyl)]amino; and R 6 is selected from lower alkylamino (except tert-butylamino) and lower cycloalkylamino.
  • R 2 is selected from ethylamino, isopropylamino, 1-methylpropylamino, 2-methylpropylamino, and 1-cyano-1-methylethylamino
  • R 4 is methoxy or ethoxy
  • R 6 is selected from ethylamino, isopropylamino and cyclopropylamino.
  • the herbicidal compositions of this invention each contain an herbicidally effective amount of at least one active 5-pyrimidinecarbonitrile.
  • the herbicidal compositions may take the form of granules, wettable powders, emulsifiable concentrates, solutions, or other known forms, depending on the mode of application.
  • the method of controlling the growth of undesired plant species within the contemplation of this invention involves applying to the area to be protected an herbicidal composition containing an herbicidally effective amount of at least one active 5-pyrimidinecarbonitrile.
  • herbicidal composition containing an herbicidally effective amount of at least one active 5-pyrimidinecarbonitrile.
  • methods of application may be utilized and are well known in the art. These include preemergence application of an herbicidal composition to the soil before planting seeds therein or to both the soil and the seeds after the seeds are sown, as well as postemergence application to growing plants.
  • This compound was prepared in the manner of Example IV, substituting 2-amino-2-methylbutyronitrile for 2-amino-2-methylpropionitrile.
  • the 2-amino-2-methylbutyronitrile was prepared in the manner of Example III.
  • the reaction product was recrystallized from carbon tetrachloride to give 4,6-dichloro-2-(1-cyano-1-methylpropylamino)-5-pyrimidinecarbonitrile; mp, 130°-147°.
  • This compound was prepared in the manner of Example V, substituting aqueous 40% methylamine for aqueous 70% ethylamine.
  • the reaction product was recrystallized from actone to give 4,6-dichloro-2-methylamino-5-pyrimidinecarbonitrile; mp, 222°-225°.
  • This compound was prepared in the manner of Example X, substituting 4,6-dichloro-2-(1-cyano-1-methylpropylamino)-5-pyrimidinecarbonitrile for 4,6-dichloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile, to give 4-chloro-2-(1-cyano-1-methylpropylamino)-6-isopropylamino-5-pyrimidinecarbonitrile; mp, 161°-166°.
  • the reaction mixture stood at room temperature for 16 hours.
  • the reaction mixture was washed with water, and the diethyl ether layer was separated.
  • the ether layer was dried over magnesium sulfate and filtered.
  • the filtrate was evaporated under reduced pressure to a residue.
  • the residue was recrystallized from petroleum ether to give 3.2 grams of 4-chloro-2,6-bis(diethylamino)-5-pyrimidinecarbonitrile; mp, 40°-42°.
  • This compound was prepared in the manner of Example XVII, substituting 4,6-dichloro-2-methylamino-5-pyrimidinecarbonitrile for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile.
  • the reaction product was recrystallized from benzene to give 4-chloro-6-isopropylamino-2-methylamino-5-pyrimidinecarbonitrile; mp, 218°-220°.
  • This compound was prepared in the manner of Example XVII, substituting 4,6-dichloro-2-isopropylamino-5-pyrimidinecarbonitrile and aqueous 40% methylamine for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile and isopropylamine.
  • the reaction product was recrystallized from methylcyclohexane to give 4-chloro-2-isopropylamino-6-methylamino-5-pyrimidinecarbonitrile; mp, 170°-173°.
  • This compound was prepared in the manner of Example XVII, substituting diethylamine for isopropylamine.
  • the product was 4-chloro-6-diethylamino-2-ethylamino-5-pyrimidinecarbonitrile; mp, 144°-146°.
  • This compound was prepared in the manner of Example X, substituting 2-aminopentane for isopropylamine.
  • the reaction product was recrystallized from a mixture of benzene and methylcyclohexane to give 4-chloro-2-(1-cyano-1-methylethylamino)-6-(1-methylbutylamino)-5-pyrimidinecarbonitrile; mp, 133°-135°.
  • This compound was prepared in the manner of Example X, substituting 1-isopropyl-2-methylpropylamine for isopropylamine.
  • the reaction product was recrystallized from a mixture of benzene and methylcyclohexane to give 4-chloro-2-(1-cyano-1-methylethylamino)-6-(1-isopropyl-2-methylpropylamino)-5-pyrimidinecarbonitrile; mp, 146°-150°.
  • This compound was prepared in the manner of Example X, substituting cyclopropylamine for isopropylamine.
  • the reaction product was recrystallized from a mixture of benzene and methylcyclohexane to give 4-chloro-2-(1-cyano-1-methylethylamino)-6-cyclopropylamino-5-pyrimidinecarbonitrile; mp, 174°-177°.
  • This compound was prepared in the manner of Example X, substituting aqueous 29.8% ammonium hydroxide for isopropylamine.
  • the reaction product was recrystallized from benzene to give 6-amino-4-chloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile; mp, 193°-198°.
  • This compound was prepared in the manner of Example X, substituting n-butylamine for isopropylamine.
  • the reaction product was recrystallized from methylcyclohexane to give 6-butylamino-4-chloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile; mp, 129°-134°.
  • This compound was prepared in the manner of Example X, substituting 4,6-dichloro-2-(1-cyano-1-methylpropylamino)-5-pyrimidinecarbonitrile and cyclopropylamine for 4, 6-dichloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile and isopropylamine.
  • the reaction product was recrystallized from carbon tetrachloride to give 4-chloro-2-(1-cyano-1-methylpropylamino)-6-cyclopropylamino-5-pyrimidinecarbonitrile; mp, 155°-159°.
  • This compound was prepared in the manner of Example XVII, substituting 4,6-dichloro-2-isopropylamino-5-pyrimidinecarbonitrile and aqueous ammonia for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile and isopropylamine.
  • the reaction product was recrystallized from benzene to give 6-amino-4-chloro-2-isopropylamino-5-pyrimidinecarbonitrile; mp, 162°-165°.
  • This compound was prepared in the manner of Example XVII, substituting 4,6-dichloro-2-isopropylamino-5-pyrimidinecarbonitrile and cyclopropylamine for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile and isopropylamine, producing 4-chloro-6-cyclopropylamino-2-isopropylamino-5-pyrimidinecarbonitrile. Upon recrystallization from methylcyclohexane, the melting point was 157°-160°.
  • This compound was prepared in the manner of Example XVII, substituting 4,6-dichloro-2-methylamino-5-pyrimidine carbonitrile and aqueous 70% ethylamine for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile and isopropylamine.
  • the product was 4-chloro-6-ethylamino-2-methylamino-5-pyrimidinecarbonitrile; mp, 155°-158°.
  • This compound was prepared in the manner of Example XV, substituting isopropylamine for diethylamine.
  • the reaction product was recrystallized from methylcyclohexane to give 4-chloro-2,6-bis(isopropylamino)-5-pyrimidinecarbonitrile; mp, 161°-162° C.
  • This compound was prepared in the manner of Example XXXIII, substituting 4-chloro-6-ethylamino-2-isopropylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile.
  • the reaction product was recrystallized from methylcyclohexane, to give 6-ethylamino-2-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 124°-126°.
  • This compound was prepared in the manner of Example XXXIII, substituting 4-chloro-2,6-bis(ethylamino)-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile.
  • the reaction product was recrystallized from a mixture of benzene and petroleum ether, to give 2,6-bis(ethylamino)-4-methoxy-5-pyrimidinecarbonitrile; mp, 114°-116°.
  • This compound was prepared in the manner of Example XXXIII, substitutiting 4-chloro-2,6-bis(diethylamino)-5- pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile.
  • the reaction product was recrystallized from petroleum ether to give 2,6-bis(diethylamino)-4-methoxy-5-pyrimidinecarbonitrile; mp, 37°-39°.
  • This compound was prepared in the manner of Example XXXV, substituting 4-chloro-6-diethylamino-2-isopropylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1 ⁇ cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile. It yielded of liquid 6-diethylamino-2-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile.
  • This compound was prepared in the manner of Example XXXV, substituting 4-chloro-2-ethylamino-6-isopropylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile.
  • the product was 2-ethylamino-6-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 125°-128°.
  • This compound was prepared in the manner of Example XXXIII, substituting 4-chloro-6-ethylamino-2-isopropylamino-5-pyrimidinecarbonitrile and a solution of sodium in ethanol for 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile and a solution of sodium in methanol.
  • the reaction product was recrystallized from petroleum ether to give 4-ethoxy-6-ethylamino-2-isopropylamino-5-pyrimidinecarbonitrile; mp, 98°-99°.
  • This compound was prepared in the manner of Example XXXV, substituting 4-chloro-6-ethylamino-2-methylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile.
  • the product was 6-ethylamino-4-methoxy-2-methylamino-5-pyrimidinecarbonitrile; mp, 147°-149°.
  • This compound was prepared in the manner of Example XXXV, substituting 4-chloro-6-isopropylamino-2-methylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile.
  • the product was 6-isopropylamino-4-methoxy-2-methylamino-5-pyrimidinecarbonitrile; mp, 112°-115°.
  • This compound was prepared in the manner of Example XXXV, substituting 4-chloro-2-isopropylamino-6-methylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile.
  • the product was 2-isopropylamino-4-methoxy-6-methylamino-5-pyrimidinecarbonitrile; mp, 134°-137°.
  • This compound was prepared in the manner of Example XXXV, substituting 4-chloro-6-diethylamino-2-ethylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile.
  • the product was 6-diethylamino-2-ethylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 73°-75°.
  • This compound was prepared in the manner of Example XXXIII, substituting 4-chloro-6-diethylamino-2-isopropylamino-5-pyrimidinecarbonitrile and a solution of sodium in ethanol for 2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile and a solution of sodium in methanol.
  • the reaction product was recrystallized from hexane to give 4-ethoxy-6-diethylamino-2-isopropylamino-5-pyrimidinecarbonitrile; mp, 55°-57°.
  • This compound was prepared in the manner of Example XXXV, substituting 4-chloro-2-(1-cyano-1-methylethylamino)-6-(1-methylbutylamino)-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile.
  • the reaction product was recrystallized twice from methylcyclohexane to give 2-(1-cyano-1-methylethylamino)-4-methoxy-6-(1-methylbutylamino)-5-pyrimidinecarbonitrile; mp, 142°-147°.
  • This compound was prepared in the manner of Example XXXV, substituting 4-chloro-2-(1-cyano-1-methylethylamino)-6-(1-isopropyl-2-methylpropylamino)-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-ispropylamino-5-pyrimidinecarbonitrile.
  • the reaction product was recrystallized from methylcyclohexane to give 2-(1-cyano-1-methylethylamino)6-(1-isopropyl-2-methylpropylamino)-4-methoxy-5-pyrimidinecarbonitrile; mp, 121°-124°.
  • This compound was prepared in the manner of Example XXXIII, substituting 6-amino4-chloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile.
  • the reaction product was recrystallized from anhydrous ethanol to give 6-amino-2-(1-cyano-1-methylethylamino)-4-methoxy-5-pyrimidinecarbonitrile; mp, 240°-243°.
  • This compound was prepared in the manner of Example XXXV, substituting 6-butylamino-4-chloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)6-isopropylamino-5-pyrimidinecarbonitrile.
  • the reaction product was recrystallized from methylcyclohexane to give 6-butylamino-2-(1-cyano-1-methylethylethylamino)-4-methoxy-5-pyrimidinecarbonitrile; mp, 120°-127°.
  • This compound was prepared in the manner of Example XXXV, substituting 4-chloro-2-(1-cyano-1-methylpropylamino)-6-cyclopropylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile.
  • the reaction product was recrystallized from a mixture of benzene and methylcyclohexane to give 2-(1-cyano-1-methylpropylamino)-6-cyclopropylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 114°-118°.
  • This compound was prepared in the manner of Example XXXV, substituting 6-amino-4-chloro-2-isopropylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile.
  • the product was 6-amino-2-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 224°-227°.
  • This compound was prepared in the manner of Example XXXV, substituting 4-chloro-6-cyclopropylamino-2-diethylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile, to produce 6-cyclopropylamino-2-diethylamino-4-methoxy-5-pyrimidinecarbonitrile. Upon recrystallization from methylcyclohexane, the melting point was 146°-150°.
  • 4-Chloro-2-cyclopropylamino-6-isopropylamino-5-pyrimidinecarbonitrile was prepared by the method of Example XVII, substituting 2,4-dichloro-6-isopropylamino-5-pyrimidinecarbonitrile (isolated from a mixture of 2,4-dichloro-6-isopropylamino-5-pyrimidinecarbonitrile and 4,6-dichloro-2-isopropylamino-5-pyrimidinecarbonitrile), and cyclopropylamine for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile and isopropylamine.
  • the reaction product was recrystallized from benzene to give 4-chloro-2-cyclopropylamino-6-isopropylamino-5-pyrimidinecarbonitrile; mp, 212°-215°.
  • 2-Cyclopropylamino-6-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile was then prepared by the method of Example LIV, substituting 4-chloro-2-cyclopropylamino-6-isopropylamino-5-pyrimidinecarbonitrile for 4-chloro-6-cyclopropylamino-2-isopropylamino-5-pyrimidinecarbonitrile.
  • the reaction product was recrystallized from methylcyclohexane to give 2-cyclopropylamino-6-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 108°-111°.
  • 2,6-Bis(cyclopropylamino)-4-methoxy-5-pyrimidinecarbonitrile was then prepared by the method of Example LIV, substituting 4-chloro-2,6-bis(cyclopropylamino)-5-pyrimidinecarbonitrile for 4-chloro-6-cyclopropylamino-2-isopropylamino-5-pyrimidinecarbonitrile.
  • the reaction product was recrystallized from methylcyclohexane to give 2,6-bis(cyclopropylamino)-4-methoxy-5-pyrimidinecarbonitrile; mp, 130°-135°.
  • 4,6-Dichloro-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile was prepared by the method of Example V, substituting 1-methylpropylamine for 70% ethylamine.
  • the reaction product was recrystallized from methylcyclohexane, then from a mixture of benzene and hexane to give 4,6-dichloro-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile; mp, 110°-120°.
  • 4-Chloro-6-cyclopropylamino-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile was prepared by the method of Example XVII, substituting 4,6-dichloro-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile and cyclopropylamine for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile and isopropylamine.
  • the reaction product was recrystallized from methylcyclohexane to give 4-chloro-6-cyclopropylamino-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile; mp, 112°-114°.
  • 6-Cyclopropylamino-4-methoxy-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile was prepared in the manner of Example LIV, substituting 4-chloro-6-cyclopropylamino-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile for 4-chloro-6-cyclopropylamino-2-isopropylamino-5-pyrimidinecarbonitrile.
  • the reaction product was recrystallized from methylcyclohexane to give 6-cyclopropylamino-4-methoxy-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile; mp, 120°-123°.
  • 4,6-Dichloro-2-(2-methylpropylamino)-5-pyrimidinecarbonitrile was prepared by the method of Example V, substituting 2-methylpropylamine for 70% ethylamine.
  • the reaction product was recrystallized from a mixture of benzene and methylcyclohexane to give 4,6-dichloro-2-(2-methylpropylamino)-5-pyrimidinecarbonitrile; mp, 137°-150°.
  • the effect of the amount of active compound applied per hectare upon performance as a preemergence herbicide was determined for several 5-pyrimidinecarbonitriles. The evaluations were conducted as described above, except that additional plant species were included in some instances, and various rates of application ranging downward from 8.96 kg per hectare were employed.
  • herbicidal 5-pyrimidinecarbonitriles are prepared by the methods described above. In general, although these compounds exhibit herbicidal activity, a number of them are not as effective as the preferred active compounds: 6-amino-2-ethylamino-4-methoxy-5-pyrimidinecarbontrile, 2-(1-cyano-1-methylethylamino)-4-methoxy-6-propylamino-5-pyrimidinecarbonitrile, 6-cyclopropylamino-2-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile, 2-diethylamino-4-methoxy-6-methylamino-5-pyrimidinecarbonitrile, 2-diethylamino-6-dimethylamino-4-methoxy-5-pyrimidinecarbonitrile, 2-ethylamino-4-methoxy-6-propylamino-5-pyrimidinecarbonitrile, 2-diethylamino-4-methoxy-6-propylamino-5-pyrimidinecarbonitrile,
  • the active 5-pyrimidinecarbonitriles of this invention may be utilized in diverse formulations to produce the herbicidal compositions contemplated herein.
  • the herbicidal compositions contain between about 0.5% and 95% active 5-pyrimidinecarbonitrile, together with between about 4% and 98.5% agriculturally acceptable carrier, and between about 1% and 15% surfactant, by weight.
  • the formulation and mode of application of an herbicidal composition may affect its activity in a given application.
  • the herbicidal 5-pyrimidinecarbonitriles disclosed herein may be formulated into granules, wettable powders, emulsifiable concentrates, solutions, or other known forms, depending on the mode of application.
  • Granular formulations are particularly useful for aerial application. These formulations may be of several types. Large particles of an absorbent carrier such as attapulgite or kaolin clay, corncobs, expanded mica, and so forth, may be impregnated with solutions of the active compounds. The active 5-pyrimidinecarbonitriles in solution or as a slurry may also be sprayed onto the surface of the absorbent particles. The core of the particle may be watersoluble or insoluble.
  • a particularly useful type of particle is one in which a wettable powder is applied as a surface coating to an insoluble granule such that the wettable powder may be dispersed on contact with moisture.
  • Granules may be produced by compacting dusts or powders, by extrusion through a die, or by use of a granulating disk. Granular formulations may vary widely in concentration, containing as little as 0.5% or as much as about 20% active compound.
  • a wettable powder typically contains a carrier such as a readily wetted inorganic diluent; for example, Fuller's earth, kaolin clays or silicas mixed with about 5% to 80%, but preferably at least 50%, herbicidally active compound and lesser amounts of surfactants.
  • Emulsifiable concentrates which are homogeneous liquid or paste compositions dispersible in water or other dispersants, may consist entirely of the active 5-pyrimidinecarbonitriles of this invention together with a liquid or solid surfactant. They may also contain agriculturally acceptable liquid carriers such as xylene, naptha, isophorone or other organic solvents.
  • Typical surfactants used in agricultural formulations include, for example, the alkyl and aralkyl sulfonates and sulfates and their sodium salts, polyethylene oxides, sulfonated oils, fatty acid esters of polyhydric alcohols, and other types of surface active agents, many of which are available in commerce.
  • Surfactants, when used, normally comprise from about 1% to 15% by weight of the herbicidal composition.
  • the herbicidal compositions of this invention may be applied without further dilution or as dilute solutions, emulsions, or suspensions in water or other suitable diluents.
  • the herbicidal compositions may be applied to the area wherein control is desired by spraying the compositions onto the undesired vegetation or the surface of the soil if they are liquids, or by distribution from mechanical equipment in the case of solids.
  • the surface-applied material may also be blended into the upper layer of soil by cultivation, or left as applied in order to gain the optimum results.
  • the herbically active compounds of this invention may be formulated and applied together with insecticides, fungicides, nematicides, fertilizers and other agricultural chemicals.
  • herbicidally effective amounts of the active compounds are employed.
  • the amount constituting an effective amount is variable, but generally, a uniform application of between about 0.1 and 9 kilograms per hectare is effective, for example, 0.28 to 4.48 kilograms per hectare.

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Abstract

5-Pyrimidinecarbonitriles, having amino substituents in the 2 and 6 positions and an alkoxy substituent in the 4 position, exhibit herbicidal activity. The preparation of novel active compounds and intermediates in this class is described; herbicidal compositions containing the active compounds are illustrated; and methods for utilizing the herbicidal compositions to control plant growth are disclosed.

Description

REFERENCE TO PRIOR APPLICATION
This is a Continuation-In-Part of Application Ser. No. 718,224, filed Aug. 27, 1976, now abandoned.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention pertains to the general field of herbicides, to novel herbicidal compounds and intermediates thereto, as well as to compositions containing the active compounds, and to new methods for the control of undesired plant growth by preemergence or postemergence application of the novel active compounds and compositions.
2. Description of the Prior Art
It has long been man's desire to promote the growth of certain plant species, those species which serve as food for man or for his animals, species which protect him from the elements, such as trees and shrubbery, and species which he finds aesthetically attractive, such as flowers. Centuries ago man learned to promote the growth of plants by applying fertilizer to them. Great commercial enterprises have been built upon processes for producing ammonia, urea, phosphates, potash, and other materials incorporated into fertilizer compositions. The value in the use of fertilizer for promoting plant growth is well known.
Man has probably always realized that certain foreign plant species, weeds, compete with his crops for the available sunlight, air, and nutrients in the soil. However, it is only recently, with the exponential growth in the world's population and the resultant demands placed upon the world's food supply, that man has developed the technical ability to selectively retard or prevent the growth of undesired plant species growing with his crops. One of the first herbicides was 2,4-dichlorophenoxyacetic acid (2,4-D), which became available in 1944 for the control of broad-leaved weeds. Since then, a number of other classes of herbicides have appeared, some of which are more selective than 2,4-D, give control at much lower rates of application, are less toxic to mammals, longer lasting, easier to use, cheaper, and do not leave residues harmful to the environment. All of these characteristics are desirable features for a herbicide to possess.
Heterocyclic organic compounds are among the newer classes of herbicides. For example, the six-member s-triazine ring system is the central structural feature in a number of commercial herbicides, including 2-t-butylamino-4-ethylamino-6-methoxy-s-triazine [Martin and Worthing, "Pesticide Manual," 4th Ed., British Crop Protection Council, Worcester, England, 1974, p. 477], 2-sec-butylamino-4-ethylamino-6-methoxy-s-triazine [ibid., p. 449], 2-chloro-4-cyclopropylamino-6-isopropylamino-s-triazine [ibid., p. 146], 2-chloro-4-ethylamino-6-isopropylamino-s-triazine [ibid., p. 23], and 2-chloro-4-(1-cyano-1-methylethylamino)-6-ethylamino-s-triazine [ibid., p. 137].
The six member 1,3-diazine (pyrimidine) ring system is less common among the known herbicides, but some 4,6-disubstituted and 2,4,6-trisubstituted 5-nitropyrimidines display herbicidal activity [Ger. Offen. 2,520,381] as do certain 2,6-diamino-5-pyrimidinecarboxamides [U.S. Pat. No. 3,845,055].
It has now been discovered that 5-pyrimidinecarbonitriles, having amino substituents in the 2 and 6 positions and an alkoxy substituent in the 4 position, are extremely effective herbicides, which control the growth of a range of grassy and broad-leaved weeds while not affecting desirable crops such as corn and cotton growing therewith. One advantage of the 2,4,6-trisubstituted 5-pyrimidinecarbonitriles of this invention is that many of them are effective at very low rates of application.
SUMMARY OF THE INVENTION
The novel active 5-pyrimidinecarbonitriles of this invention and the novel compounds useful as intermediates thereto are represented collectively by the following structural formula: ##STR1## wherein R2 is a radical selected from amino, lower alkylamino, lower cycloalkylamino, di(lower alkyl)amino, [alpha-cyano(lower alkyl)]amino, and halogen; R4 is a radical selected from lower alkoxy, and halogen; and R6 is a radical selected from amino, lower alkylamino, lower cycloalkylamino, di(lower alkyl)amino, and halogen; with the proviso that no more than two of R2, R4 and R6 are halogen; and provided further that neither R2 nor R6 is tert-butylamino; and when R2 is isopropylamino, R6 is other than n-butylamino; and when R2 is methylethylamino, R6 is other than isopropylamino; and when R2 is diethylamino, R6 is other than amino. In defining R2, R4, and R6, the term "lower" means 1-7 carbon atoms, preferably 1-4 carbon atoms.
These novel intermediates and the novel active 5-pyrimidinecarbonitriles prepared therefrom can be obtained conveniently from a 2,4,6-trihalo-5-pyrimidinecarbonitrile. 2,4,6-Trichloro-5-pyrimidinecarbonitrile is available from barbituric acid and urea via 2,4,6-trihydroxy-5-pyrimidinecarboxamide [Scarborough and Gould, J. Org. Chem., 26, 3720 (1961); U.S. Pat. No. 3,097,910]. Alpha-aminonitriles are employed in preparing 5-pyrimidinecarbonitriles containing an [alphacyano(lower-alkyl)]amino group in the R2 position. Alpha-aminonitriles may be prepared by the Strecker synthesis [Freifelder and Hasbrouck, J. Amer. Chem. Soc., 82, 696 (1960)].
The novel intermediates of this invention contain at least one, but no more than two, halogen atoms, preferably chlorine. They are obtained by the displacement of one or two of the halogen atoms of a 2,4,6-trihalo-5-pyrimidinecarbonitrile. Among the former, especially useful intermediates comprise 4,6-dichloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile, 4,6-dichloro-2-isopropylamino-5-pyrimidinecarbonitrile and 4,6-dichloro-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile; whereas among the latter, 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile, 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile, 4-chloro-2-(1-cyano-1-methylethylamino)-6-cyclopropylamino-5-pyrimidinecarbonitrile, 4-chloro-6-cyclopropylamino-2-isopropylamino-5-pyrimidinecarbonitrile, and 4-chloro-6-cyclopropylamino-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile are especially useful.
In the novel active 5-pyrimidinecarbonitriles of this invention all three of the halogen atoms of the 2,4,6-trihalo-5-pyrimidinecarbonitrile are displaced, so that R2 is a radical selected from amino, lower alkylamino, lower cycloalkylamino, di(lower alkyl)amino, and [alpha-cyano(lower alkyl)]amino; R4 is a lower alkoxy radical; and R6 is a radical selected from amino, lower alkylamino, lower cycloalkylamino, and di(lower alkyl)amino; with the proviso that neither R2 nor R6 is tert-butylamino; and provided further that when R2 is isopropylamino, R6 is other than n-butylamino; and when R2 is methylethylamino, R6 is other than isopropylamino; and when R2 is diethylamino, R6 is other than amino.
Preferred active compounds result when R2 is selected from lower alkylamino (except tert-butylamino) and [alpha-cyano-(lower alkyl)]amino; and R6 is selected from lower alkylamino (except tert-butylamino) and lower cycloalkylamino.
Especially preferred active compounds result if R2 is selected from ethylamino, isopropylamino, 1-methylpropylamino, 2-methylpropylamino, and 1-cyano-1-methylethylamino; R4 is methoxy or ethoxy; and R6 is selected from ethylamino, isopropylamino and cyclopropylamino.
The herbicidal compositions of this invention each contain an herbicidally effective amount of at least one active 5-pyrimidinecarbonitrile. The herbicidal compositions may take the form of granules, wettable powders, emulsifiable concentrates, solutions, or other known forms, depending on the mode of application.
The method of controlling the growth of undesired plant species within the contemplation of this invention involves applying to the area to be protected an herbicidal composition containing an herbicidally effective amount of at least one active 5-pyrimidinecarbonitrile. A variety of methods of application may be utilized and are well known in the art. These include preemergence application of an herbicidal composition to the soil before planting seeds therein or to both the soil and the seeds after the seeds are sown, as well as postemergence application to growing plants.
The synthesis of the herbicidal 5-pyrimidinecarbonitriles from 2,4,6-trichloro-5-pyrimidinecarbonitrile is described by the following chemical equations.
DETAILED DESCRIPTION OF THE INVENTION
Syntheses of the active 5-pyrimidinecarbonitriles and intermediates thereto are illustrated in the following Examples, wherein all temperatures are in degrees centigrade and pressures are in mm of mercury. ##STR2##
EXAMPLE I 2,4,6-Trihydroxy-5-pyrimidinecarboxamide
A mixture of 128 grams of barbituric acid and 120 grams of urea in 200 ml of 1-methyl-2-pyrrolidone was heated at 145° for 15 minutes. Hot water was then added to the reaction mixture; a white solid precipitated and was collected by filtration. The precipitate was washed with hot dimethylformamide and dried to give 165 grams of 2,4,6-trihydroxy-5-pyrimidinecarboxamide; mp, >270°. The mass spectrum of the product was consistent with the assigned structure.
EXAMPLE II 2,4,6-Trichloro-5-pyrimidinecarbonitrile
A stirred mixture of 40 grams (24 ml) of phosphorus oxychloride and 9 grams of 2,4,6-trihydroxy-5-pyrimidinecarboxamide was refluxed for 1 hour. An additional 12 ml of phosphorus oxychloride was then added, and the mixture was refluxed for an additional 3 hours. The excess phosphorus oxychloride was removed by distillation, and the residue was poured into a mixture of ice and water. The aqueous mixture was extracted with chloroform. The extract was dried with magnesium sulfate and filtered. The filtrate was evaporated under reduced pressure to a residue. The residue was sublimed to give 2 grams of 2,4,6-trichloro-5-pyrimidinecarbonitrile; mp, 117°-119°. The mass spectrum of the product was consistent with the assigned structure.
EXAMPLE III 2-Amino-2-methylpropionitrile
To a stirred solution of 54 grams of sodium cyanide in 250 ml of water at room temperature was added 73 grams of ammonium sulfate. The reaction mixture was cooled to 10°-15°, and 58 grams of acetone was added dropwise. Upon complete addition, the stirred reaction mixture was allowed to stand at room temperature for 60 hours. The organic layer was separated, and the aqueous layer was extracted with diethyl ether. The extract was combined with the organic layer, and the combination was dried over magnesium sulfate. The mixture was filtered, and the filtrate was evaporated under reduced pressure at room temperature to a residue. The residue was distilled under reduced pressure to give 24 grams of 2-amino-2-methylpropionitrile; bp, 74°-82°/70 mm. The NMR spectrum of the product was consistent with the assigned structure.
EXAMPLE IV 4,6-Dichloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile
A stirred solution of 6.3 grams of 2,4,6-trichloro-5-pyrimidinecarbonitrile in 25 ml of acetone was cooled to -10°, and 2.5 grams of 2-amino-2-methylpropionitrile was added. With the reaction mixture at -10°, a solution of 1.3 grams of sodium hydroxide in 3.5 ml of water was added dropwise. Upon complete addition, the reaction mixture was stirred at -10° for 30 minutes. The acetone was removed under reduced pressure; the residue was extracted with diethyl ether, and the extract was separated and dried over magnesium sulfate. The extract was filtered, and the filtrate was evaporated under reduced pressure, yielding a residue. The residue was recrystallized from methylcyclohexane to give 3.1 grams of 4,6-dichloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile; mp, 154°-158°.
Analysis: Calculated for C9 H7 Cl2 N5 : C,42.21; H,2.73; N,27.34; Found: C,42.26; H,2.92; N,27.35.
EXAMPLE V 4,6-Dichloro-2-ethylamino-5-pyrimidinecarbonitrile
A stirred solution of 12.9 grams of 2,4,6-trichloro-5-pyrimidinecarbonitrile in 150 ml of acetone was cooled to -10°, and 7.7 grams of an aqueous 70% ethylamine solution was added dropwise during 2 hours. The temperature of the reaction mixture was maintained at -10° throughout the addition. Following complete addition, the reaction mixture was allowed to warm to room temperature, where it stood for 16 hours. Then most of the acetone was removed by evaporation under reduced pressure. The residue was extracted with a mixture of water and diethyl ether. The ether layer was separated and dried over magnesium sulfate. The dried ether layer was filtered, and the ether was removed under reduced pressure. The residue was recrystallized from a mixture of methylcyclohexane and benzene, then from carbon tetrachloride, to give 4.2 grams of 4,6-dichloro-2- ethylamino-5-pyrimidinecarbonitrile; mp, 145°-150°.
Analysis: Calculated for C7 H6 Cl2 H4 : C,38.74; H,2.78; N,25.80; Found: C,38.47; H,2.97; N,25.90.
EXAMPLE VI 4,6-Dichloro-2-isopropylamino-5-pyrimidinecarbonitrile
A stirred solution of 4.2 grams of 2,4,6-trichloro-5-pyrimidinecarbonitrile in 100 ml of diethyl ether was cooled to between -5° and -10°, and a solution of 2.4 grams of isopropylamine in 100 ml of diethyl ether was added dropwise. Upon complete addition, water was added to the reaction mixture, and the ether layer was separated. The ethereal layer was dried over magnesium sulfate and filtered. The filtrate was evaporated to dryness under reduced pressure. The residue was recrystallized from methylcyclohexane to give 2.4 grams of 4,6-dichloro-2-isopropylamino-5-pyrimidinecarbonitrile; mp, 179°-181°.
Analysis: Calculated for C8 H8 Cl2 N4 : C,41.57; H,3.47; N,24.23; Found: C,41.33; H,3.35; N,23.97.
EXAMPLE VII 4,6-Dichloro-2-(1-cyano-1-methylpropylamino)-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example IV, substituting 2-amino-2-methylbutyronitrile for 2-amino-2-methylpropionitrile. The 2-amino-2-methylbutyronitrile was prepared in the manner of Example III. The reaction product was recrystallized from carbon tetrachloride to give 4,6-dichloro-2-(1-cyano-1-methylpropylamino)-5-pyrimidinecarbonitrile; mp, 130°-147°.
EXAMPLE VIII 4,6-Dichloro-2-diethylamino-5-pyrimidinecarbonitrile
A stirred solution of 6.3 grams of 2,4,6-trichloro-5-pyrimidinecarbonitrile in 150 ml of diethyl ether was cooled to -10°, and a solution of 4.4 grams of diethylamine in 75 ml of diethyl ether was added dropwise. Upon complete addition, the reaction mixture was stirred at -10° for 1 hour. Water was added to the reaction mixture. The diethyl ether layer was separated and dried over magnesium sulfate. The mixture was filtered, and the filtrate was evaporated under reduced pressure to a residue. The residue was recrystallized from methylcyclohexane to give 3.8 grams of 4,6-dichloro-2-diethylamino-5-pyrimidinecarbonitrile; mp, 125°-126°.
Analysis: Calculated for C9 H10 Cl2 N4 : C,44.10; H,4.07; N,22.85; Found: C,44.13; H,4.28; N,23.14.
EXAMPLE IX 4,6-Dichloro-2-methylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example V, substituting aqueous 40% methylamine for aqueous 70% ethylamine. The reaction product was recrystallized from actone to give 4,6-dichloro-2-methylamino-5-pyrimidinecarbonitrile; mp, 222°-225°.
Analysis: Calculated for C6 H4 N4 C12 : C,35.50; H,1.97; N,27.60; Found: C,35.85; H,2.12; N,27.90.
EXAMPLE X 4-Chloro-2,6-bis(methylamino)-5-pyrimidinecarbonitrile
The crude reaction product of Example IX, approximately 19% 4,6-dichloro-2-methylamino-5-pyrimidinecarbonitrile and 72% 2,4-dichloro-6-methylamino-5-pyrimidinecarbonitrile, was treated with aqueous 40% methylamine in the manner of Example V, to give 4-chloro-2,6-bis(methylamino)-5-pyrimidinecarbonitrile; mp, 281°-284° C.
Analysis: Calculated for C7 H8 ClN5 : C,42.60; H,4.05; N,35.50; Found: C,42.80; H,4.24; N,35.44.
EXAMPLE XI 4-Chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile
To a stirred solution of 5.1 grams of 4,6-dichloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile in 100 ml of acetone, 2.3 grams of isopropylamine was added dropwise. The reaction mixture was then stirred at room temperature for 16 hours. The acetone was removed under reduced pressure, and the reaction mixture was extracted with a mixture of diethyl ether and water. The organic layer was separated and dried over magnesium sulfate. The solution was filtered, and the filtrate was evaporated under reduced pressure, yielding a residue. The residue was recrystallized from methylcyclohexane to give 2.7 grams of 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile; mp, 144°-147°.
Analysis: Calculated for C12 H15 ClN6 : C,51.70; H,5.42; N,30.14; Found: C,51.05; H,5.20; N,29.85.
EXAMPLE XII 4-Chloro-2-(1-cyano-1-methylpropylamino)-6-isopropylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example X, substituting 4,6-dichloro-2-(1-cyano-1-methylpropylamino)-5-pyrimidinecarbonitrile for 4,6-dichloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile, to give 4-chloro-2-(1-cyano-1-methylpropylamino)-6-isopropylamino-5-pyrimidinecarbonitrile; mp, 161°-166°.
Analysis: Calculated for C13 H17 ClN6 : C,53.33; H,5.85; N,28.70; Found: C,53.22; H,5.78; N,28.75.
EXAMPLE XIII 4-Chloro-6-ethylamino-2-isopropylamino-5-pyrimidinecarbonitrile
A stirred solution of 3.5 grams of 4,6-dichloro-2-isopropylamino-5-pyrimidinecarbonitrile in 100 ml of acetone was cooled to between 0° and -5°; a solution of 2.1 grams of aqueous 70% ethylamine in 25 ml of acetone was added dropwise. Upon complete addition, the reaction mixture was warmed to room temperature and stirred for 18 hours. The acetone was removed under reduced pressure, and the residue was extracted with a mixture of diethyl ether and water. The organic layer was separated and dried over magnesium sulfate. The mixture was filtered, and the filtrate was evaporated to dryness under reduced pressure. The residue was recrystallized from methylcyclohexane to give 3.1 grams of 4-chloro-6-ethylamino-2-isopropylamino-5-pyrimidinecarbonitrile; mp, 144°-146°.
Analysis: Calculated for C9 H12 ClN5 : C,47.90; H,5.35; N,31.03; Found: C,47.70; H,5.40; N,31.15.
EXAMPLE XIV 4-Chloro-2,6-bis(ethylamino)-5-pyrimidinecarbonitrile
To a stirred solution of 6.3 grams of 2,4,6-trichloro-5-pyrimidinecarbonitrile in 75 ml of acetone was added dropwise 7.7 grams of an aqueous solution of 70% ethylamine. Upon complete addition, the reaction mixture was stirred at room temperature for 60 hours. The acetone was removed by evaporation under reduced pressure. The residue was extracted with a mixture of diethyl ether and water, and 2.9 grams of insoluble 4-chloro-2,6-bis(ethylamino)-5-pyrimidinecarbonitrile, mp, 190°-191°, remained.
Analysis: Calculated for C9 H12 ClN5 : C,47.90; H,5.35; N,31.03; Found: C,47.70; H,5.40; N,31.15.
EXAMPLE XV 4-Chloro-2,6-bis(diethylamino)-5-pyrimidinecarbonitrile
To a stirred solution of 6.3 grams of 2,4,6-trichloro-5-pyrimidinecarbonitrile in 150 ml of diethyl ether at 10° was added dropwise 8.8 grams of diethylamine in 150 ml of diethyl ether. Upon complete addition, the reaction mixture was allowed to warm to room temperature, where it was stirred for 16 hours. The reaction mixture was heated under reflux for 1 hour, then cooled to room temperature. The reaction mixture was washed with water, and the diethyl ether layer was separated. The aqueous layer was washed with diethyl ether. The ether layers were combined and dried over magnesium sulfate. The mixture was filtered, and the filtrate was evaporated under reduced pressure to a residue. The residue was recrystallized from petroleum ether to give crude 4-chloro-2,6-bis(diethylamino)-5-pyrimidinecarbonitrile. This crude material was dissolved in diethyl ether, and 4.4 grams of diethylamine was added.
The reaction mixture stood at room temperature for 16 hours. The reaction mixture was washed with water, and the diethyl ether layer was separated. The ether layer was dried over magnesium sulfate and filtered. The filtrate was evaporated under reduced pressure to a residue. The residue was recrystallized from petroleum ether to give 3.2 grams of 4-chloro-2,6-bis(diethylamino)-5-pyrimidinecarbonitrile; mp, 40°-42°.
Analysis: Calculated for C13 H20 ClN5 : C,55.41; H,7.15; N,24.85; Found: C,55.41; H,7.39; N,25.30.
EXAMPLE XVI 4-Chloro-6-diethylamino-2-isopropylamino-5-pyrimidinecarbonitrile
To a stirred solution of 4.3 grams of 4,6-dichloro-2-isopropylamino-5-pyrimidinecarbonitrile in 125 ml of diethyl ether was added dropwise 2.6 grams of diethylamine. Upon complete addition, the reaction mixture was stirred at room temperature for 1.5 hours. The reaction mixture was washed with water. The diethyl ether layer was separated and dried over magnesium sulfate. The mixture was filtered, and the filtrate was evaporated under reduced pressure to a residue. The residue was recrystallized from methylcyclohexane to give 2.5 grams of 4-chloro-6-diethylamino-2-isopropylamino-5-pyrimidinecarbonitrile; mp, 74°-76°.
Analysis: Calculated for C12 H18 ClN5 : C,53.83; H,6.74; N,26.15; Found: C,53.42; H,6.54; N,25.85.
EXAMPLE XVII 4-Chloro-2-ethylamino-6-isopropylamino-5-pyrimidinecarbonitrile
To a stirred solution of 6.5 grams of 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile in 100 ml of acetone was added dropwise 7.4 grams of isopropylamine in 30 ml of acetone. Upon complete addition, the reaction mixture was stirred at room temperature for 16 hours. The acetone was removed by evaporation under reduced pressure, and the solid residue was washed with water. The resultant solid was collected by filtration to give 6.8 grams of 4-chloro-2-ethylamino-6-isopropylamino-5-pyrimidinecarbonitrile; mp 160°-165°. Recrystallization from a mixture of benzene and methylcyclohexane gave purified product; mp, 163°-165°.
Analysis: Calculated for C10 H14 ClN5 : C,50.10; H,5.88; N,29.21; Found: C,49.96; H,6.15; N,29.06.
EXAMPLE XVIII 4-Chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile
A stirred solution of 5.1 grams of 4,6-dichloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile in 50 ml of acetone was cooled to 0° to -5°, and 2.8 grams of an aqueous solution of 70% ethylamine in 40 ml of acetone was added dropwise. The temperature of the reaction mixture was maintained at 0° to -5° throughout the addition, then during 2 hours following complete addition. The reaction mixture was warmed to room temperature where it was stirred for 1 hour. Water was added to the reaction mixture, which caused precipitation of a solid. The solid was collected by filtration and recrystallized from a mixture of benzene and methylcyclohexane to give 3.3 grams of 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile; mp, 157°-160°.
Analysis: Calculated for C11 H13 ClN6 : C,50.59; H,5.18; N,31.55; Found: C,50.61; H,4.88; N,31.80.
EXAMPLE XIX 4-Chloro-6-isopropylamino-2-methylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XVII, substituting 4,6-dichloro-2-methylamino-5-pyrimidinecarbonitrile for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized from benzene to give 4-chloro-6-isopropylamino-2-methylamino-5-pyrimidinecarbonitrile; mp, 218°-220°.
Analysis: Calculated for C9 H12 ClN5 : C,47.90; H,5.36; N,31.03; Found: C,47.47; H,5.33; N,31.94.
EXAMPLE XX 4-Chloro-2-isopropylamino-6-methylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XVII, substituting 4,6-dichloro-2-isopropylamino-5-pyrimidinecarbonitrile and aqueous 40% methylamine for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile and isopropylamine. The reaction product was recrystallized from methylcyclohexane to give 4-chloro-2-isopropylamino-6-methylamino-5-pyrimidinecarbonitrile; mp, 170°-173°.
Analysis: Calculated for C9 H12 ClN5 : C,47.90; H,5.36; N,31.03; Found: C,48.12; H,5.59; N,31.10.
EXAMPLE XXI 4-Chloro-6-diethylamino-2-ethylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XVII, substituting diethylamine for isopropylamine. The product was 4-chloro-6-diethylamino-2-ethylamino-5-pyrimidinecarbonitrile; mp, 144°-146°.
Analysis: Calculated for C11 H15 ClN5 : C,52.28; H,5.98; N,27.71; Found: C,52.05; H,6.09; N,27.93.
EXAMPLE XXII 4-Chloro-2-(1-cyano-1-methylethylamino)-6-(1-methylbutylamino)-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example X, substituting 2-aminopentane for isopropylamine. The reaction product was recrystallized from a mixture of benzene and methylcyclohexane to give 4-chloro-2-(1-cyano-1-methylethylamino)-6-(1-methylbutylamino)-5-pyrimidinecarbonitrile; mp, 133°-135°.
Analysis: Calculated for C14 H19 C,N6 : C,54.80; H,6.24; N,27.39; Found: C,54.91; H,6.41; N,27.59.
EXAMPLE XXIII 4-Chloro-2-(1-cyano-1-methylethylamino)-6-(1-isopropyl-2-methylpropylamino)-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example X, substituting 1-isopropyl-2-methylpropylamine for isopropylamine. The reaction product was recrystallized from a mixture of benzene and methylcyclohexane to give 4-chloro-2-(1-cyano-1-methylethylamino)-6-(1-isopropyl-2-methylpropylamino)-5-pyrimidinecarbonitrile; mp, 146°-150°.
Analysis: Calculated for C16 H23 ClN6 : C,57.38; H,6.92; N,25.10; Found: C,57.05; H,6.30; N,25.38.
EXAMPLE XXIV 4-Chloro-2-(1-cyano-1-methylethylamino)-6-cyclopropylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example X, substituting cyclopropylamine for isopropylamine. The reaction product was recrystallized from a mixture of benzene and methylcyclohexane to give 4-chloro-2-(1-cyano-1-methylethylamino)-6-cyclopropylamino-5-pyrimidinecarbonitrile; mp, 174°-177°.
Analysis: Calculated for C12 H13 ClN6 : C,52.08; H,4.73; N,30.35; Found: C,51.98; H,5.00; N,30.41.
EXAMPLE XXV 6-Amino-4-chloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example X, substituting aqueous 29.8% ammonium hydroxide for isopropylamine. The reaction product was recrystallized from benzene to give 6-amino-4-chloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile; mp, 193°-198°.
Analysis: Calculated for C9 H9 ClN6 : C,45.67; H,3.83; N,35.51; Found: C,45.66; H,4.07; N,35.57.
EXAMPLE XXVI 6-Butylamino-4-chloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example X, substituting n-butylamine for isopropylamine. The reaction product was recrystallized from methylcyclohexane to give 6-butylamino-4-chloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile; mp, 129°-134°.
Analysis: Calculated for C13 H17 ClN6 : C,53.33; H,5.85; N,28.70; Found: C,53.62; H,5.98; N,28.77.
EXAMPLE XXVII 4-Chloro-2-(1-cyano-1-methylpropylamino)-6-cyclopropylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example X, substituting 4,6-dichloro-2-(1-cyano-1-methylpropylamino)-5-pyrimidinecarbonitrile and cyclopropylamine for 4, 6-dichloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile and isopropylamine. The reaction product was recrystallized from carbon tetrachloride to give 4-chloro-2-(1-cyano-1-methylpropylamino)-6-cyclopropylamino-5-pyrimidinecarbonitrile; mp, 155°-159°.
Analysis: Calculated for C13 H15 ClN6 : C,53.70; H,5.20; N,28.90; Found: C,53.10; H,5.17; N,29.28.
EXAMPLE XXVIII 6-Amino-4-chloro-2-isopropylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XVII, substituting 4,6-dichloro-2-isopropylamino-5-pyrimidinecarbonitrile and aqueous ammonia for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile and isopropylamine. The reaction product was recrystallized from benzene to give 6-amino-4-chloro-2-isopropylamino-5-pyrimidinecarbonitrile; mp, 162°-165°.
Analysis: Calculated for C8 H10 ClN5 : C,45.39; H,4.76; N,33.08; Found: C,45.71; H,4.94; N,32.88.
EXAMPLE XXIX 4-Chloro-6-cyclopropylamino-2-isopropylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XVII, substituting 4,6-dichloro-2-isopropylamino-5-pyrimidinecarbonitrile and cyclopropylamine for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile and isopropylamine, producing 4-chloro-6-cyclopropylamino-2-isopropylamino-5-pyrimidinecarbonitrile. Upon recrystallization from methylcyclohexane, the melting point was 157°-160°.
Analysis: Calculated for C11 H14 ClN5 : C,52.66; H,5.71; N,27.87; Found: C,52.57; H,5.71; N,27.84.
EXAMPLE XXX 4-Chloro-6-cyclopropylamino-2-diethylamino-5-pyrimidinecarbonitrile
To a stirred solution of 6.9 grams of 4,6-dichloro-2-diethylamino-5-pyrimidinecarbonitrile in 80 ml of acetone was added dropwise 3.2 grams of cyclopropylamine in 20 ml of acetone. The reaction mixture stood for 16 hours; then the acetone was removed by evaporation under reduced pressure. The residue was washed with water, and the resultant solid was collected. The solid was washed several times with water, then dried, to give 6.5 grams of crude product; mp, 100°-105°. The crude product was recrystallized from petroleum ether to give 2.5 grams of 4-chloro-6-cyclopropylamino-2-diethylamino-5-pyrimidinecarbonitrile; mp, 120°-122°.
Analysis: Calculated for C12 H16 ClN5 : C,54.23; H,6.06; N,26.35; Found: C,54.12; H,5.99; N,26.43.
EXAMPLE XXXI 4-Chloro-6-ethylamino-2-methylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XVII, substituting 4,6-dichloro-2-methylamino-5-pyrimidine carbonitrile and aqueous 70% ethylamine for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile and isopropylamine. The product was 4-chloro-6-ethylamino-2-methylamino-5-pyrimidinecarbonitrile; mp, 155°-158°.
Analysis: Calculated for C8 H10 ClN5 : C,45.5p; H<5>13; N,33.20; Found: C,45.22; H,4.80; N,33.50.
EXAMPLE XXXII 4-Chloro-2,6-bis(isopropylamino)-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XV, substituting isopropylamine for diethylamine. The reaction product was recrystallized from methylcyclohexane to give 4-chloro-2,6-bis(isopropylamino)-5-pyrimidinecarbonitrile; mp, 161°-162° C.
Analysis: Calculated for C11 H16 ClN5 : C,52.07; H,6.35; N,27.60; Found: C,52.04; H,6.69; N,27.45.
EXAMPLE XXXIII 2-(1-Cyano-1-methylethylamino)-6-ethylamino-4-methoxy-5-pyrimidinecarbonitrile
To a stirred solution of 2.7 grams of 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile in 50 ml of methanol was added a solution of 0.3 gram of sodium in 10 ml of methanol. The reaction mixture was heated under reflux for 3 hours. An additional small quantity of sodium in methanol was then added to the reaction mixture, and heating under reflux was continued for 1.5 hours. The excess methanol was removed from the reaction mixture by evaporation under reduced pressure. The residue was extracted with a mixture of diethyl ether and water. The diethyl ether layer was separated, washed with water, then dried over magnesium sulfate. The mixture was filtered, and the filtrate was evaporated under reduced pressure to a residue. The residue was washed with methylcyclohexane, and the insoluble solid was collected by filtration. The solid was recrystallized from benzene to give 1.7 grams of 2-(1-cyano-1-methylethylamino)-6-ethylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 130°-132°.
Analysis: Calculated for C12 H16 N6 O: C,55.37; H,6.20 N,32.29; Found: C,55.68; H,6.48; N,32.23.
EXAMPLE XXXIV 2-(1-Cyano-1-methylpropylamino)-6-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXIII substituting 4-chloro-2-(1-cyano-1-methylpropylamino)-6-isopropylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized from a mixture of benzene and hexane to give 2-(1-cyano-1-methylpropylamino)-6-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 145°-146°.
Analysis: Calculated for C14 H20 N6 O: C,58.31; H,6.99; N,29.14; Found: C,58.19; H,6.64; N,28.72.
EXAMPLE XXXV 2-(1-Cyano-1-methylethylamino)-6-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile
A solution of 3.8 grams of 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile in methanol was added to a solution of 0.3 gram of sodium in 20 ml of methanol. The reaction mixture was heated under reflux for 4 hours, then allowed to stand at room temperature for 60 hours. The solution resulting from the addition of 0.05 gram of sodium to 5 ml of methanol was added to the reaction mixture. The reaction mixture was then heated under reflux for 3 hours.
The excess methanol was removed under reduced pressure, and the residue was extracted with a mixture of diethyl ether and water. The ether layer was separated and dried over magnesium sulfate. The mixture was filtered, and the filtrate was evaporated to dryness under vacuum. The residue was recrystallized from a mixture of benzene and petroleum ether to give 1.1 grams of 2-(1-cyano-1-methylethylamino)-6-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 156°-159°.
Analysis: Calculated for C13 H18 N6 O: C,56.92; H,6.61; N,30.64; Found: C,57.10; H,6.70; N,30.90.
EXAMPLE XXXVI 6-Ethylamino-2-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXIII, substituting 4-chloro-6-ethylamino-2-isopropylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized from methylcyclohexane, to give 6-ethylamino-2-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 124°-126°.
Analysis: Calculated for C11 H17 N5 O: C,56.15; H,7.28; N,29.77; Found: C,55.87; H,7.16; N,28.99. EXAMPLE XXXVII
2,6-Bis(ethylamino)-4-methoxy-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXIII, substituting 4-chloro-2,6-bis(ethylamino)-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized from a mixture of benzene and petroleum ether, to give 2,6-bis(ethylamino)-4-methoxy-5-pyrimidinecarbonitrile; mp, 114°-116°.
Analysis: Calculated for C10 H15 N5 O: C,54.28; H,6.83; N,31.66; Found: C,54.38; H,7.08; N,31.93.
EXAMPLE XXXVIII 2,6-Bis(diethylamino)-4-methoxy-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXIII, substitutiting 4-chloro-2,6-bis(diethylamino)-5- pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized from petroleum ether to give 2,6-bis(diethylamino)-4-methoxy-5-pyrimidinecarbonitrile; mp, 37°-39°.
Analysis: Calculated for C14 H23 N5 O: C,60.62; H,8.36; N,25.25; Found: C,60.92; H,8.40; N,25.60.
EXAMPLE XXXIX 6-Diethylamino-2-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXV, substituting 4-chloro-6-diethylamino-2-isopropylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1═cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile. It yielded of liquid 6-diethylamino-2-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile.
Analysis: Calculated for C13 H21 N5 O: C,59.29; H,8.04; N,26.60; Found: C,59.00; H,8.33; N,26.36.
EXAMPLE XL 2-Ethylamino-6-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXV, substituting 4-chloro-2-ethylamino-6-isopropylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile. The product was 2-ethylamino-6-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 125°-128°.
Analysis: Calculated for C11 H17 N5 O: C,56.15; H,7.28; N,29.76; Found: C,56.12; H,6.99; N,29.75.
EXAMPLE XLI 4-Ethoxy-6-ethylamino-2-isopropylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXIII, substituting 4-chloro-6-ethylamino-2-isopropylamino-5-pyrimidinecarbonitrile and a solution of sodium in ethanol for 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile and a solution of sodium in methanol. The reaction product was recrystallized from petroleum ether to give 4-ethoxy-6-ethylamino-2-isopropylamino-5-pyrimidinecarbonitrile; mp, 98°-99°.
Analysis: Calculated for C12 H19 N5 O: C,57.81; H,7.68; N,28.09; Found: C,57.89; H,7.59; N,28.18.
EXAMPLE XLII 6-Ethylamino-4-methoxy-2-methylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXV, substituting 4-chloro-6-ethylamino-2-methylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile. The product was 6-ethylamino-4-methoxy-2-methylamino-5-pyrimidinecarbonitrile; mp, 147°-149°.
Analysis: Calculated for C9 H13 N5 O: C,52.16; H,6.32; N,33.80; Found: C,52.08; H,6.60; N,34.07.
EXAMPLE XLIII 6-Isopropylamino-4-methoxy-2-methylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXV, substituting 4-chloro-6-isopropylamino-2-methylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile. The product was 6-isopropylamino-4-methoxy-2-methylamino-5-pyrimidinecarbonitrile; mp, 112°-115°.
Analysis: Calculated for C10 H15 N5 O: C,54.28; H,6.83; N,31.66; Found: C,53.14; H,6.61; N,32.26.
EXAMPLE XLIV 2-Isopropylamino-4-methoxy-6-methylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXV, substituting 4-chloro-2-isopropylamino-6-methylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile. The product was 2-isopropylamino-4-methoxy-6-methylamino-5-pyrimidinecarbonitrile; mp, 134°-137°.
Analysis: Calculated for C10 H15 N5 O: C,54.28; H,6.83; N,31.66; Found: C,53.63; H,6.50; N,31.88.
EXAMPLE XLV 6-Diethylamino-2-ethylamino-4-methoxy-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXV, substituting 4-chloro-6-diethylamino-2-ethylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile. The product was 6-diethylamino-2-ethylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 73°-75°.
Analysis: Calculated for C12 H18 N5 O: C,57.81; H,7.68; N,28.09; Found: C,57.67; H,7.46; N,28.26.
EXAMPLE XLVI 4-Ethoxy-6-diethylamino-2-isopropylamino-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXIII, substituting 4-chloro-6-diethylamino-2-isopropylamino-5-pyrimidinecarbonitrile and a solution of sodium in ethanol for 2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile and a solution of sodium in methanol. The reaction product was recrystallized from hexane to give 4-ethoxy-6-diethylamino-2-isopropylamino-5-pyrimidinecarbonitrile; mp, 55°-57°.
Analysis: Calculated for C14 H23 N5 O: C,60.62; H,8.36; N,25.25; Found: C,60.32; H,8.33; N,25.30.
EXAMPLE XLVII 2-(1-Cyano-1-methylethylamino)-4-methoxy-6-(1-methylbutylamino)-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXV, substituting 4-chloro-2-(1-cyano-1-methylethylamino)-6-(1-methylbutylamino)-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized twice from methylcyclohexane to give 2-(1-cyano-1-methylethylamino)-4-methoxy-6-(1-methylbutylamino)-5-pyrimidinecarbonitrile; mp, 142°-147°.
Analysis: Calculated for C15 H22 N6 O: C,59.58; H,7.33; N,27.80; Found: C,59.43; H,7.59; N,27.75.
EXAMPLE XLVIII 2-(1-Cyano-1-methylethylamino)-6-(1-isopropyl-2-methylpropylamino)-4-methoxy-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXV, substituting 4-chloro-2-(1-cyano-1-methylethylamino)-6-(1-isopropyl-2-methylpropylamino)-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-ispropylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized from methylcyclohexane to give 2-(1-cyano-1-methylethylamino)6-(1-isopropyl-2-methylpropylamino)-4-methoxy-5-pyrimidinecarbonitrile; mp, 121°-124°.
Analysis: Calculated for C17 H26 N6 O: C,61.79; H,7.93; N,25.44; Found: C,61.49; H,7.73; N,25.67.
EXAMPLE XLIX 2-(1-Cyano-1-methylethylamino)-6-cyclopropylamino-4-methoxy-5-pyrimidinecarbonitrile
To a stirred solution of 0.8 gram of sodium methoxide in 100 ml of methanol was added portionwise 4.2 grams of4-chloro-2-(1-cyano-1-methylethylamino)-6-cyclopropylamino-5-pyrimidinecarbonitrile. Upon complete addition, the reaction mixture was heated under reflux for 3.5 hours, then allowed to stand at room temperature for 16 hours. The methanol was removed by evaporation under reduced pressure. The residue was extracted with a mixture of water and methylene chloride. The methylene chloride layer was separated and dried over magnesium sulfate. The mixture was filtered, and the filtrate was evaporated under reduced pressure. The residue was recrystallized twice from carbon tetrachloride to give 2.4 grams of 2-(1-cyano-1-methylethylamino)-6-cyclopropylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 138°-140°.
Analysis: Calculated for C13 H16 N6 O: C,57.33; H,5.93; N,30.86; Found: C,57.21; H,5.99; N,30.84.
EXAMPLE L 6-Amino-2-(1-cyano-1-methylethylamino)-4-methoxy-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXIII, substituting 6-amino4-chloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-ethylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized from anhydrous ethanol to give 6-amino-2-(1-cyano-1-methylethylamino)-4-methoxy-5-pyrimidinecarbonitrile; mp, 240°-243°.
Analysis: Calculated for C10 H12 N6 O: C,51.71; H,5.21; N,36.19; Found: C,51.70; H,5.51; N,36.47.
EXAMPLE LI 6-Butylamino-2-(1-cyano-1-methylethylamino)4-methoxy-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXV, substituting 6-butylamino-4-chloro-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)6-isopropylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized from methylcyclohexane to give 6-butylamino-2-(1-cyano-1-methylethylethylamino)-4-methoxy-5-pyrimidinecarbonitrile; mp, 120°-127°.
Analysis: Calculated for C14 H20 N6 O: C,58.31; H,6.99; N,29.14; Found: C,57.87; H,6.69; N,29.48.
EXAMPLE LII 2-(1-Cyano-1-methylpropylamino)-6-cyclopropylamino-4-methoxy-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXV, substituting 4-chloro-2-(1-cyano-1-methylpropylamino)-6-cyclopropylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized from a mixture of benzene and methylcyclohexane to give 2-(1-cyano-1-methylpropylamino)-6-cyclopropylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 114°-118°.
Analysis: Calculated for C14 H18 N6 O: C,58.73; H,6.34; N,29.35; Found: C,58.70; H,6.55; N,29.35.
EXAMPLE LIII 6-Amino-2-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXV, substituting 6-amino-4-chloro-2-isopropylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile. The product was 6-amino-2-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 224°-227°.
Analysis: Calculated for C9 H13 N5 O: C,52.16; H,6.32; N,33.80; Found: C,51.80; H,6.39; N,33.87.
EXAMPLE LIV 6-Cyclopropylamino-2-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile
To a stirred solution of 0.9 gram of sodium methoxide in 100 ml of methanol was added, in one portion, 4.0 grams of 4-chloro-6-cyclopropylamino-2-isopropylamino-5-pyrimidinecarbonitrile. The reaction mixture was then heated under reflux for 3 hours. The methanol was removed by evaporation under reduced pressure to give a residue. The residue was washed with water, and the solid was collected by filtration to yield 3.5 grams of 6-cyclopropylamino-2-isopropylamino-4-methoxy-5- pyrimidinecarbonitrile; mp, 142°-147°.
Analysis: Calculated for C12 H17 N5 O; C,58.28; H,6.92; N,28.31; Found: C,58.04; H,6.98; N,28.34.
EXAMPLE LV 6-Cyclopropylamino-2-diethylamino-4-methoxy-5-pyrimidinecarbonitrile
This compound was prepared in the manner of Example XXXV, substituting 4-chloro-6-cyclopropylamino-2-diethylamino-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile, to produce 6-cyclopropylamino-2-diethylamino-4-methoxy-5-pyrimidinecarbonitrile. Upon recrystallization from methylcyclohexane, the melting point was 146°-150°.
Analysis: Calculated for C13 H14 N5 O: C,59.15; H,7.33; N,26.80; Found: C,59.02; H,7.05; N,26.79.
EXAMPLE LVI 2,6-Bis(isopropylamino)-4-methoxy-5-pyrimidinecarbonitrile
To a solution of 6.3 grams of 4-chloro-2,6-bis(isopropylamino)-5-pyrimidinecarbonitrile in 100 ml of methanol was added a solution of methanolic sodium methoxide (0.805 grams of sodium in 50 ml of methanol). After complete addition, the reaction mixture was stirred for 16 hours. The reaction mixture was then heated under reflux for 5 hours. The excess methanol was removed under reduced pressure. The residue was extracted with a mixture of diethyl ether and water. The organic layer was separated and dried over magnesium sulfate. The mixture was filtered, and the filtrate was evaporated to dryness under reduced pressure. The residue was recrystallized from cyclohexane, to give 4.5 grams of 2,6-bis(isopropylamino)-4-methoxy-5-pyrimidinecarbonitrile; mp, 131°-133°.
Analysis: Calculated for C12 H19 N5 O: C,57.81; H,7.68; N,28.09; Found: C,57.57; H,7.62; N,28.15.
EXAMPLE LVII 4-Methoxy-2,6-bis(methylamino)-5-pyrimidinecarbonitrile
This compound, mp, 177°-179°, was prepared by the method of Example XXXV, substituting 4-chloro-2,6-bis(methylamino)-5-pyrimidinecarbonitrile for 4-chloro-2-(1-cyano-1-methylethylamino)-6-isopropylamino-5-pyrimidinecarbonitrile.
EXAMPLE LVIII 2-Cyclopropylamino-6-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile
4-Chloro-2-cyclopropylamino-6-isopropylamino-5-pyrimidinecarbonitrile was prepared by the method of Example XVII, substituting 2,4-dichloro-6-isopropylamino-5-pyrimidinecarbonitrile (isolated from a mixture of 2,4-dichloro-6-isopropylamino-5-pyrimidinecarbonitrile and 4,6-dichloro-2-isopropylamino-5-pyrimidinecarbonitrile), and cyclopropylamine for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile and isopropylamine. The reaction product was recrystallized from benzene to give 4-chloro-2-cyclopropylamino-6-isopropylamino-5-pyrimidinecarbonitrile; mp, 212°-215°.
Analysis: Calculated for C11 H14 ClN5 : C,52.48; H,5.61; N,27.82; Found: C,52.69; H,5.77; N,28.05.
2-Cyclopropylamino-6-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile was then prepared by the method of Example LIV, substituting 4-chloro-2-cyclopropylamino-6-isopropylamino-5-pyrimidinecarbonitrile for 4-chloro-6-cyclopropylamino-2-isopropylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized from methylcyclohexane to give 2-cyclopropylamino-6-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile; mp, 108°-111°.
Analysis: Calculated for C12 H17 N5 O: C,58.28; H,6.93; N,28.32; Found: C,58.70; H,6.78; N,28.66.
EXAMPLE LIX 2,6-Bis(cyclopropylamino)-4-methoxy-5-pyrimidinecarbonitrile
4-Chloro-2,6-bis(cyclopropylamino)-5-pyrimidinecarbonitrile was prepared by the method of Example XIV, substituting cyclopropylamine for 70% ethylamine. The reaction product was recrystallized from a mixture of benzene and methylcyclohexane to give 4-chloro-2,6-bis(cyclopropylamino)-5-pyrimidinecarbonitrile; mp, 210°-215°.
Analysis: Calculated for C11 H12 ClN5 : C,52.91; H,4.84; N,28.04; Found: C,52.53; H,4.99; N,27.67.
2,6-Bis(cyclopropylamino)-4-methoxy-5-pyrimidinecarbonitrile was then prepared by the method of Example LIV, substituting 4-chloro-2,6-bis(cyclopropylamino)-5-pyrimidinecarbonitrile for 4-chloro-6-cyclopropylamino-2-isopropylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized from methylcyclohexane to give 2,6-bis(cyclopropylamino)-4-methoxy-5-pyrimidinecarbonitrile; mp, 130°-135°.
Analysis: Calculated for C12 H15 N5 O: C,58.76; H,6.16; N,28.56; Found: C,58.71; H,6.53; N,28.75.
EXAMPLE LX 6-Cyclopropylamino-4-methoxy-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile
4,6-Dichloro-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile was prepared by the method of Example V, substituting 1-methylpropylamine for 70% ethylamine. The reaction product was recrystallized from methylcyclohexane, then from a mixture of benzene and hexane to give 4,6-dichloro-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile; mp, 110°-120°.
Analysis: Calculated for C9 H10 Cl2 N4 : C,44.10; H,4.11; N,22.86; Found: C,44.34; H,4.43; N,22.88.
4-Chloro-6-cyclopropylamino-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile was prepared by the method of Example XVII, substituting 4,6-dichloro-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile and cyclopropylamine for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile and isopropylamine. The reaction product was recrystallized from methylcyclohexane to give 4-chloro-6-cyclopropylamino-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile; mp, 112°-114°.
Analysis: Calculated for C12 H16 ClN5 : C,54.24; H,6.07; N,26.35; Found: C,54.13; H,6.25; N,26.38.
6-Cyclopropylamino-4-methoxy-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile was prepared in the manner of Example LIV, substituting 4-chloro-6-cyclopropylamino-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile for 4-chloro-6-cyclopropylamino-2-isopropylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized from methylcyclohexane to give 6-cyclopropylamino-4-methoxy-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile; mp, 120°-123°.
Analysis: Calculated for C13 H19 N5 O: C,59.75; H,7.33; N,26.80; Found: C,59.26; H,7.39; N,26.61.
EXAMPLE LXI 4-Methoxy-6-(1-methylethylamino)-2-(2-methylpropylamino)-5-pyrimidinecarbonitrile
4,6-Dichloro-2-(2-methylpropylamino)-5-pyrimidinecarbonitrile was prepared by the method of Example V, substituting 2-methylpropylamine for 70% ethylamine. The reaction product was recrystallized from a mixture of benzene and methylcyclohexane to give 4,6-dichloro-2-(2-methylpropylamino)-5-pyrimidinecarbonitrile; mp, 137°-150°.
Analysis: Calculated for C9 H10 Cl2 N4 : C,44.10; H,4.11; N,22.86; Found: C,43.62; H,4.08; N,22.67.
4-Chloro-6-(1-methylethylamino)-2-(2-methylpropylamino)-5-pyrimidinecarbonitrile was prepared by the method of Example XVII, substituting 4,6-dichloro-2-(2-methylpropylamino)-5-pyrimidinecarbonitrile for 4,6-dichloro-2-ethylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized from methylcyclohexane to give 4-chloro-6-(1-methylethylamino)-2-(2-methylpropylamino)-5-pyrimidinecarbonitrile; mp, 170°-172°.
Analysis: Calculated for C12 H18 ClN5 : C,53.82; H,6.77; N,26.16; Found: C,53.79; H,6.95; N,26.41.
4-Methoxy-6-(1-methylethylamino)-2-(2-methylpropyl-amino)-5-pyrimidinecarbonitrile was prepared in the manner of Example LIV, substituting 4-chloro-6-(1-methylethylamino)-2-(2-methylpropylamino)-5-pyrimidinecarbonitrile for 4-chloro-6-cyclopropylamino-2-isopropylamino-5-pyrimidinecarbonitrile. The reaction product was recrystallized from methylcyclohexane to give 4-methoxy-6-(1-methylethylamino)-2-(2-methylpropylamino)-5-pyrimidinecarbonitrile; mp, 99°-101°.
Analysis: Calculated for C13 H21 N5 O: C,59.29; H,8.04; N,26.16; Found: C,59.15; H,7.68; N,25.79.
The ability of the herbicidally active compounds to control undesired plant growth was demonstrated as follows:
For preemergence tests, rows of the seeds of lima bean (Phaseolus lunatus), corn (Zea mays), wild oats (Avena fatua), lettuce (Lactuca sativa), mustard (Brassica juncea) and crabgrass (Digitaria sanguinalis) were planted together in 15 cm by 20 cm by 8 cm flats containing approximately 5 cm of sandy loam soil. After planting, an aqueous acetone solution of one of the active compounds was sprayed directly on the soil and exposed seeds, the active compound being applied uniformly at 8.96 kg per hectare. A thin layer of soil, approximately 1.3 cm deep, was then applied over the seeds. The flats were maintained in a greenhouse, and watered regularly on the surface of the soil for 10-14 days. At the end of this period, the phytotoxicity of the compound was recorded. Individual plant species were examined for percent kill, and a vigor rating of 0 to 5 was assigned to the surviving plants, a vigor rating of 5 signifying no chemical injury, 4- slight injury (plants have or are expected to recover), 3- moderate to severe injury (plants expected to recover in time), 2- moderate to severe injury (plants not expected to recover), 1- severe injury (plants not expected to recover), and 0- complete kill. Table 1 lists data collected in preemergence tests with herbicidally active compounds of the present invention.
                                  TABLE 1                                 
__________________________________________________________________________
PREEMERGENCE HERBICIDAL ACTIVITY OF 5-PYRIMIDINE-                         
CARBONITRILES*                                                            
Active Compound                                                           
         Lima Bean                                                        
               Corn                                                       
                   Wild Oats                                              
                         Lettuce                                          
                              Mustard                                     
                                   Crabgrass                              
of Example                                                                
         K  V  K V K.sup.a                                                
                         K  V K  V K  V                                   
__________________________________________________________________________
XXXIII   0  3  0 3 0     100                                              
                            0 100                                         
                                 0 80 2                                   
XXXIV    0  2  0 2 0     100                                              
                            0 100                                         
                                 0 100                                    
                                      0                                   
XXXV     0  5  0 4 0     0  4 30 4 0  4                                   
XXXVI    0  4  0 3 0     90 1 90 1 90 1                                   
XXXVII   0  5  0 4 0     60 4 100                                         
                                 0 90 1                                   
XXXVIII  0  5  0 5 0     0  5 0  4 90 1                                   
XXXIX    0  5  0 5 0     0  4 80 2 0  4                                   
XL       0  5  0 5 0     0  4 0  4 0  4                                   
XLI      0  5  0 5 0     100                                              
                            0 100                                         
                                 0 100                                    
                                      0                                   
XLII     0  5  0 5 0     0  3 100                                         
                                 0 80 2                                   
XLIII    0  5  0 5 0     0  4 80 2 90 1                                   
XLIV     0  4  0 5 0     0  5 0  5 0  4                                   
XLV      0  5  0 5 0     80 3 100                                         
                                 0 100                                    
                                      0                                   
XLVII    0  5  0 5 0     0  4 90 1 0  4                                   
XLVIII   0  5  0 5 0     0  5 90 1 50 3                                   
XLIX     100                                                              
            0  0 2 0     100                                              
                            0 100                                         
                                 0 85 2                                   
LIII     0  3  0 4 0     0  2 80 2 0  3                                   
LVI      0  4  0 4 0     0  3 0  3 0  3                                   
LVII     0  5  0 5 0     0  4 40 4 0  4                                   
__________________________________________________________________________
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 of 5 signifying no chemical injury. 5Pyrimidinecarbonitrile applied      
 uniformly at 8.96 kg per hectare.                                        
 .sup.a Surviving plants expected to recover.
In postemergence tests, untreated plants prepared as described above were maintained in a greenhouse and watered regularly for a period of 10-14 days, until the first trifoliate leaves of the bean plants were unfolding. The plants were then sprayed uniformly with an aqueous acetone solution of one of the herbicidally active compounds at 8.96 kg per hectare as in the preemergence tests. The treated plants were maintained in a greenhouse and watered regularly for an additional 10-14 days. At the end of that time the phytotoxicity of the compound was recorded as in the preemergence tests. The results of these tests appear in Table 2.
                                  TABLE 2                                 
__________________________________________________________________________
POSTEMERGENCE HERBICIDAL ACTIVITY OF 5-PYRIMIDINE-                        
CARBONITRILES*                                                            
Active Compound                                                           
         Lima Bean                                                        
               Corn Wild Oats                                             
                          Lettuce                                         
                               Mustard                                    
                                    Crabgrass                             
of Example                                                                
         K  V  K  V K  V  K  V K  V K  V                                  
__________________________________________________________________________
XXXIII   0  4  0  5 0  4  100                                             
                             0 100                                        
                                  0 0  5                                  
XXXIV    100                                                              
            0  0  5 0  5  100                                             
                             0 100                                        
                                  0 100                                   
                                       0                                  
XXXV     100                                                              
            0  100                                                        
                  0 100                                                   
                       0  100                                             
                             0 100                                        
                                  0 100                                   
                                       0                                  
XXXVI    100                                                              
            0  0  4 80 2  100                                             
                             0 100                                        
                                  0 100                                   
                                       0                                  
XXXVII   0  3  0  3 100                                                   
                       0  100                                             
                             0 100                                        
                                  0 100                                   
                                       0                                  
XXXVIII  0  3  75 3 100                                                   
                       0  100                                             
                             0 90 1 90 1                                  
XXXIX    0  4  0  3 90 1  100                                             
                             0 100                                        
                                  0 100                                   
                                       0                                  
XL       0  4  0  5 0  5  90 1 90 1 100                                   
                                       0                                  
XLI      100                                                              
            0  0  5 50 4  100                                             
                             0 100                                        
                                  0 100                                   
                                       0                                  
XLII     0  4  0  5 0  4  90 1 100                                        
                                  0 90 1                                  
XLIII    0  4  75 1 0  4  80 2 100                                        
                                  0 85 2                                  
XLIV     0  2  0  5 0  3  100                                             
                             0 100                                        
                                  0 100                                   
                                       0                                  
XLV      100                                                              
            0  25 4 0  3  100                                             
                             0 100                                        
                                  0 100                                   
                                       0                                  
XLVII    50 3  0  5 0  5  100                                             
                             0 100                                        
                                  0 100                                   
                                       0                                  
XLVIII   0  5  0  5 0  5  100                                             
                             0 100                                        
                                  0 100                                   
                                       0                                  
XLIX     100                                                              
            0  100                                                        
                  0 100                                                   
                       0  100                                             
                             0 100                                        
                                  0 100                                   
                                       0                                  
LIII     0  3  0  5 0  5  0  4 39 4 80 2                                  
LVI      0  3  0  5 0  4  50 2 0  3 0  4                                  
LVII     0  5  0  5 0  5  0  5 0  5 0  5                                  
__________________________________________________________________________
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 or 5 signifying no chemical injury. 5Pyrimidinecarbonitrile applied      
 uniformly at 8.96 kg per hectare.
The effect of the amount of active compound applied per hectare upon performance as a preemergence herbicide was determined for several 5-pyrimidinecarbonitriles. The evaluations were conducted as described above, except that additional plant species were included in some instances, and various rates of application ranging downward from 8.96 kg per hectare were employed. The following plant species were added in some tests: sugarbeen (Beta vulgaris); onion (Allium cepa); green foxtain (Setaria viridis); soybean (Glycine max); cotton (Gossypium hirsutum); sorghum (Sorghum vulgare); sicklepod (Cassia obtusifolia); barley (Hordeum vulgare); barnyardgrass (Echinochloa crusgalli); peanut (Arachis hypogaea); safflower (Carthamus tinctorius); tomato (Lycopersicon esculentum); flax (Linum usitatissimum); rice (Oryza sativa); wheat (Triticum aestivium); cocklebur (Xanthium pensylvanicum); pigweed (Amaranthus retroflexus); morningglory (Ipomoea purpurea); rape (Brassica campestris); prickly sida (Sida spinosa L.); lambsquarter (Chenopodium album). The results of these tests appear in Tables 3 through 21.
              TABLE 3                                                     
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON                                            
PREEMERGENCE PERFORMANCE OF 2-(1-CYANO-1-                                 
METHYL-ETHYLAMINO)-6-ETHYLAMINO-4-METHOXY-5-                              
PYRIMIDINECARBONITRILE (Example XXXIII)*                                  
        0.14  0.28    0.56     1.12   2.24                                
        kg/ha kg/ha   kg/ha    kg/ha  kg/ha                               
Crop      K.sup.a K     V   K    V   K    V   K    V                      
______________________________________                                    
Lima Bean 0       0     5   0    5   25   4   100  0                      
Corn      0       0     5   0    5   0    5   0    5                      
Wild Oat  0       0     5   0    5   20   4   20   4                      
Sugarbeet 0       0     5   30   4   100  0   100  0                      
Onion     25      25    4   50   4   100  0   100  0                      
Green Foxtail                                                             
          0       0     5   0    4   60   3   100  0                      
Soybean   0       0     5   0    5   0    4   75   3                      
Cotton    0       0     5   0    5   0    5   0    5                      
Sorghum   0       0     5   0    5   50   4   90   3                      
Sicklepod 0       0     5   0    5   0    5   0    4                      
Barley    0       0     5   0    5   10   4   75   4                      
Barnyardgrass                                                             
          0       0     5   0    5   25   4   100  0                      
Peanut    0       0     5   0    5   0    5   0    5                      
Safflower 0       0     5   0    5   10   4   50   4                      
Tomato    0       0     5   0    5   80   4   100  0                      
Flax      0       0     5   50   4   90   2   100  0                      
Rice      0       0     5   0    5   0    5   100  0                      
Wheat     0       0     5   0    5   10   4   75   4                      
Nutsedge  0       0     5   0    5   0    5   0    5                      
Lettuce   --      20    4   80   3   100  0   100  0                      
Mustard   --      95    1   100  0   100  0   100  0                      
Crabgrass --      90    1   90   1   100  0   100  0                      
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 of 5 signifying no chemical injury.                                      
 .sup.a Surviving plants expected to recover.                             

              TABLE 4                                                     
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON PREEMER-                                   
GENCE PERFORMANCE OF 2-(1-CYANO-1-METHYL-                                 
PROPYLAMINO)-6-ISOPROPYLAMINO-4-METHOXY-5-                                
PYRIMIDINECARBONITRILE (Example XXXIV)*                                   
              0.56    1.12     2.24   4.48                                
0.28 kg/ha    kg/ha   kg/ha    kg/ha  kg/ha                               
Crop    K.sup.a   K     V   K    V   K    V   K    V                      
______________________________________                                    
Lima Bean                                                                 
        0         0     5   0    4   0    4   50   2                      
Corn    0         0     5   0    5   0    5   0    5                      
Wild Oats                                                                 
        0         0     5   0    5   20   4   75   3                      
Lettuce 0         75    4   100  0   100  0   100  0                      
Mustard 0         75    2   90   1   100  0   100  0                      
Crabgrass                                                                 
        0         60    4   80   1   100  0   100  0                      
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 of 5 signifying no chemical injury.                                      
 .sup.a Surviving plants expected to recover.                             

              TABLE 5                                                     
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON PREEMER-                                   
GENCE PERFORMANCE OF 2-(1-CYANO-1-METHYL-                                 
ETHYLAMINO)-6-ISOPROPYLAMINO-4-METHOXY-5-                                 
PYRIMIDINECARBONITRILE (Example XXXV)*                                    
         0.28                                                             
         kg/ha 0.56 kg/ha                                                 
                         1.12 kg/ha                                       
                                   2.24 kg/hz                             
CROP       K.sup.a K.sup.a   K    V    K    V                             
______________________________________                                    
Lima Bean  0       0         0    5    100  0                             
Corn       0       0         0    5    30   0                             
Wild Oats  0       0         0    5    0    5                             
Sugarbeet  0       10        100  0    100  0                             
Onion      30      75        100  0    100  0                             
Green Foxtail                                                             
           0       0         50   4    100  0                             
Soybean    0       0         0    5    0    5                             
Cotton     0       0         0    5    0    5                             
Sorghum    0       0         0    5    0    5                             
Sicklepod  0       0         0    5    0    5                             
Barley     0       0         30   4    100  0                             
Barnyardgrass                                                             
           0       0         10   4    100  0                             
Peanut     0       0         0    5    0    5                             
Safflower  0       0         0    5    0    4                             
Tomato     0       0         25   4    100  0                             
Flax       0       0         50   4    100  0                             
Rice       0       0         0    5    50   4                             
Wheat      0       0         10   4    75   3                             
Nutsedge   0       0         0    5    0    5                             
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               
 .sup.a Surviving plants expected to recover.                             

              TABLE 6                                                     
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON PREEMER-                                   
GENCE PERFORMANCE OF 6-ETHYLAMINO-2-ISO-                                  
PROPYLAMINO-4-METHOXY-5-PYRIMIDINE-                                       
CARBONITRILE (Example XXXVI)*                                             
         2.24 kg/ha                                                       
                 4.48 kg/ha 8.96 kg/ha                                    
CROP       K.sup.a   K.sup.a    K    V                                    
______________________________________                                    
Lima Bean  0         0          0    5                                    
Corn       0         0          0    4                                    
Wild Oats  0         0          0    3                                    
Lettuce    0         25         75   2                                    
Mustard    0         40         90   1                                    
Crabgrass  0         0          0    2                                    
Nutsedge   0         0          0    5                                    
______________________________________                                    
 *Entries under K refer to percent kill; under V to plant vigor, a vigor o
 5 signifying no chemical injury.                                         
 .sup.a Surviving plants are expected to recover.                         

              TABLE 7                                                     
______________________________________                                    
EFFECT OF APPLICATION                                                     
LEVEL ON PREEMERGENCE                                                     
PERFORMANCE OF 6-ETHYLAMINO-4-METHOXY-2-                                  
METHYLAMINO-5-PYRIMIDINECARBONITRILE                                      
(EXAMPLE XLII)*                                                           
         2.24 kg/ha   4.48 kg/ha                                          
CROP       K.sup.a        K      V                                        
______________________________________                                    
Lima Bean  50             100    0                                        
Corn       0              0      5                                        
Wild Oats  0              0      4                                        
Lettuce    0              25     4                                        
Mustard    0              90     1                                        
Crabgrass  0              75     2                                        
Nutsedge   0              0      5                                        
______________________________________                                    
 *Entries under K refer to percent kill; under V to plant vigor, a vigor o
 5 signifying no chemical injury.                                         
 .sup.a Surviving plants expected to recover.                             

              TABLE 8                                                     
______________________________________                                    
EFFECT OF APPLICATION                                                     
LEVEL ON PREEMERGENCE                                                     
PERFORMANCE OF 6-ISOPROPYLAMINO-4-METHOXY-                                
2-METHYLAMINO-5-PYRIMIDINECARBONITRILE                                    
(Example XLIII)*                                                          
        2.24 kg/ha                                                        
                 4.48 kg/ha 8.96 kg/ha                                    
CROP      K.sup.a    K      V     K    V                                  
______________________________________                                    
Lima Bean 0          0      5     0    4                                  
Corn      0          0      5     0    5                                  
Wild Oats 0          0      5     0    5                                  
Lettuce   0          30     4     10   4                                  
Mustard   0          30     4     40   4                                  
Crabgrass 0          75     2     75   2                                  
Nutsedge  0          0      5     9    5                                  
______________________________________                                    
 Entries under K refer to percent kill; under V, to plant vigor, a vigor  
 rating of 5 signifying no chemical injury.                               
 .sup.a Surviving plants expected to recover.                             

              TABLE 9                                                     
______________________________________                                    
EFFECT OF APPLICATION                                                     
LEVEL ON PREEMERGENCE                                                     
PERFORMANCE OF 6-DIETHYLAMINO-2-ETHYLAMINO-                               
4-METHOXY-5-PYRIMIDINECARBONITRILE                                        
(Example XLV)*                                                            
         4.48 kg/ha   8.96 kg/ha                                          
CROP       K.sup.a        K      V                                        
______________________________________                                    
Lima Beans 0              0      5                                        
Corn       0              0      5                                        
Wild Oats  0              0      5                                        
Lettuce    0              10     4                                        
Mustard    30             100    0                                        
Crabgrass  0              90     1                                        
Nutsedge   0              0      5                                        
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               
 .sup.a Surviving plants expected to recover.                             

              TABLE 10                                                    
______________________________________                                    
EFFECT OF APPLICATION                                                     
LEVEL ON PREEMERGENCE                                                     
PERFORMANCE OF 4-ETHOXY-6-DIETHYLAMINO-2-                                 
ISOPROPYLAMINO-5-PYRIMIDINECARBONITRILE                                   
(Example XLVI)*                                                           
              2.24 kg/ha                                                  
                      4.48 kg/ha                                          
CROP            K.sup.a   K.sup.a                                         
______________________________________                                    
Lima Beans      0         0                                               
Corn            0         0                                               
Wild Oat        0         0                                               
Lettuce         0         0                                               
Mustard         0         0                                               
Crabgrass       0         0                                               
Soybean         0         0                                               
Cotton          0         0                                               
Flax            0         0                                               
Peanut          0         0                                               
Rice            0         0                                               
Sugarbeet       0         0                                               
Rape            0         0                                               
Foxtail         0         0                                               
Sorghum         0         0                                               
Barnyardgrass   0         0                                               
Onion           20        75                                              
Safflower       0         0                                               
Prickly Sida    0         0                                               
Morningglory    0         0                                               
Tomato          0         0                                               
Nutsedge        0         0                                               
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               
 .sup.a Surviving plants expected to recover.                             

              TABLE 11                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON PREEMERGENCE                               
PERFORMANCE OF 2-(1-CYANO-1-METHYLETHYL-                                  
AMINO)-4-METHOXY-6-(1-METHYLBUTYLAMINO)-5-                                
PYRIMIDINE-CARBONITRILE                                                   
(Example XLVII)*                                                          
        0.28                                                              
        kg/  0.56 kg/ 1.12 kg/ 2.24 kg/                                   
                                      4.48 kg/                            
        ha   ha       ha       ha     ha                                  
CROP      K.sup.a                                                         
                 K      V   K    V   K    V   K    V                      
______________________________________                                    
Rice      0      0      5   0    5   0    5   0    5                      
Flax      0      0      5   0    5   0    5   0    5                      
Safflower 0      0      5   0    5   0    5   0    5                      
Tomato    0      0      5   0    5   0    5   0    5                      
Peanut    0      0      5   0    5   0    5   0    5                      
Wheat     0      0      5   0    5   0    5   0    5                      
Morningglory                                                              
          0      0      5   0    5   0    5   0    5                      
Sugarbeet 0      100    0   100  0   100  0   100  0                      
Lima Bean 0      0      5   0    5   0    5   0    5                      
Corn      0      0      5   0    5   0    5   0    4                      
Soybean   0      0      5   0    5   0    5   0    5                      
Oat       0      0      5   0    5   0    5   0    5                      
Sorghum   0      0      5   0    5   0    5   0    5                      
Barley    0      0      5   0    5   0    5   0    5                      
Cotton    0      0      5   0    5   0    5   0    5                      
Sicklepod 0      0      5   0    5   0    5   0    5                      
Barnyardgrass                                                             
          0      0      5   0    5   0    5   0    4                      
Foxtail   0      0      5   0    5   0    5   0    4                      
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               
 .sup.a Surviving plants expected to recover.                             

              TABLE 12                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON PREEMERGENCE                               
PERFORMANCE OF 2-(1-CYANO-1-METHYLETHYL-                                  
AMINO)-6-CYCLOPROPYLAMINO-4-METHOXY-5-                                    
PYRIMIDINECARBONITRILE (Example XLIX)*                                    
       0.14                                                               
       kg/   0.28 kg/ 0.56 kg/ 1.12 kg/                                   
                                      2.24 kg/                            
       ha    ha       ha       ha     ha                                  
CROP     K     V     K    V   K    V   K    V   K    V                    
______________________________________                                    
Lima bean                                                                 
         0     5     0    5   0    5   0    4   100  0                    
Corn     0     5     0    5   0    5   0    5   60   3                    
Wild oat 0     5     0    5   0    5   30   4   75   4                    
Sugarbeet                                                                 
         0     5     0    5   80   4   80   4   100  0                    
Onion    30    4     100  0   100  0   100  0   100  0                    
Green Fox-                                                                
tail     20    3     50   2   75   2   90   1   100  0                    
Soybean  0     5     0    5   0    5   0    4   75   0                    
Cotton   0     5     0    5   0    5   0    5   0    5                    
Lettuce  --    --    --   --  90   2   100  0   100  0                    
Mustard  --    --    --   --  90   2   100  0   100  0                    
Sorghum  0     5     0    5   0    5   0    4   30   4                    
Sicklepod                                                                 
         0     5     0    5   0    5   0    4   0    4                    
Barley   0     5     0    5   0    5   0    5   0    4                    
Barnyard-                                                                 
grass    0     5     0    4   0    4   30   4   80   2                    
Peanut   0     5     0    5   0    5   0    5   0    5                    
Safflower                                                                 
         0     5     0    5   20   4   75   2   100  0                    
Tomato   0     5     0    4   75   3   75   3   100  0                    
Flax     0     5     0    5   75   4   75   3   100  0                    
Rice     0     5     0    5   0    5   40   4   100  0                    
Wheat    0     5     0    5   0    5   30   4   100  0                    
Nutsedge 0     5     0    5   0    5   0    5   0    5                    
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               

              TABLE 13                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON PREEMERGENCE                               
PERFORMANCE OF 6-AMINO-2-(1-CYANO-1-METHYL-                               
ETHYLAMINO)-4-METHOXY-5-PYRIMIDINE-                                       
CARBONITRILE (Example L)*                                                 
0.56 kg/     1.12 kg/ 2.24 kg/ 4.48 kg/                                   
                                      8.96 kg/                            
ha           ha       ha       ha     ha                                  
CROP    K      V     K    V   K    V   K    V   K    V                    
______________________________________                                    
Lima Bean                                                                 
        0      4     100  0   100  0   100  0   100  0                    
Corn    0      5     60   4   100  0   100  0   100  0                    
Wild Oat                                                                  
        0      5     10   4   100  0   100  0   100  0                    
Lettuce 90     1     100  0   100  0   100  0   100  0                    
Mustard 0      4     60   4   100  0   100  0   100  0                    
Crabgrass                                                                 
        30     3     30   3   80   1   100  0   100  0                    
Nutsedge                                                                  
        0      5     0    5   0    5   0    5   0    4                    
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               

              TABLE 14                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON PREEMERGENCE                               
PERFORMANCE OF 6-BUTYLAMINO-2-(1-CYANO-1-                                 
METHYLETHYLAMINO)-4-METHOXY-5-PYRIMIDINE                                  
CARBONITRILE (Ex. LI)*                                                    
        0.56 kg/                                                          
               1.12 kg/  2.24 kg/  4.48 kg/                               
        ha     ha        ha        ha                                     
CROP      K.sup.a  K.sup.a   K     V   K     V                            
______________________________________                                    
Lima Bean 0        0         0     5   0     4                            
Corn      0        0         0     5   0     5                            
Wild Oats 0        0         0     5   40    0                            
Lettuce   0        0         75    0   100   0                            
Mustard   0        40        100   0   100   0                            
Crabgrass 0        10        40    3   100   0                            
Nutsedge  0        0         0     5   0     5                            
Morningglory                                                              
          0        0         0     5   0     4                            
Peanut    0        0         0     4   0     4                            
Soybean   0        0         0     5   0     5                            
Sicklepod 0        0         0     5   0     5                            
Barley    0        0         0     5   0     5                            
Wheat     0        0         0     5   0     4                            
Flax      0        0         30    4   30    4                            
Safflower 0        0         0     5   0     5                            
Lambsquarter                                                              
          30       75        100   0   100   0                            
Barnyardgrass                                                             
          0        0         0     5   0     5                            
Green Foxtail                                                             
          0        0         100   0   100   0                            
Tomato    0        0         20    4   100   0                            
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               
 .sup.a Surviving plants expected to recover.                             

              TABLE 15                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON PREEMERGENCE                               
PERFORMANCE OF 2-(1-CYANO-1-METHYL-                                       
PROPYLAMINO)-6-CYCLOPROPYLAMINO-4-METHOXY-                                
5-PYRIMIDINECARBONITRILE (Example LII)*                                   
                                    4.48 kg/                              
        0.56 kg/ha                                                        
                1.12 kg/ha                                                
                          2.24 kg/ha                                      
                                    ha                                    
CROP      K       V     K     V   K     V   K    V                        
______________________________________                                    
Lima Bean 0       5     0     5   100   0   100  0                        
Corn      0       5     0     5   0     4    60  0                        
Wild Oats 0       5     0     5   50    4   100  0                        
Lettuce   0       4     75    2   100   0   100  0                        
Mustard   100     0     100   0   100   0   100  0                        
Crabgrass 25      3     60    2   75    1   100  0                        
Tomato    0       4     100   0   100   0   100  0                        
Wheat     0       5     0     4   100   0   100  0                        
Safflower 0       5     0     5   20    4   100  0                        
Peanut    0       5     0     4   0     4    0   4                        
Soybean   0       5     0     5   0     4    80  2                        
Cotton    0       5     0     5   0     5    0   5                        
Rice      0       5     0     5   50    4    90  2                        
Sorghum   0       5     0     5   0     4   100  0                        
Barnyardgrass                                                             
          0       5     0     3   100   0   100  0                        
Sicklepod 0       5     0     5   0     5   100  0                        
Morningglory                                                              
          0       5     100   0   100   0   100  0                        
Nutsedge  0       5     0     5   0     5    0   5                        
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               

              TABLE 16                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON PREEMERGENCE                               
PERFORMANCE OF 6-CYCLOPROPYLAMINO-2-                                      
ISOPROPYLAMINO-4-METHOXY-5-PYRIMIDINE-                                    
CARBONITRILE (Example LIV)*                                               
0.14 kg/     0.28 kg/ 0.56 kg/ 1.12 kg/                                   
                                      2.24 kg/                            
ha           ha       ha       ha     ha                                  
Crop    K      V     K    V   K    V   K    V   K    V                    
______________________________________                                    
Lima Bean                                                                 
        0      5     0    5   0    5   0    4   75   2                    
Corn    0      5     0    5   0    5   0    5   0    4                    
Wild Oat                                                                  
        0      5     0    5   0    5   50   3   50   3                    
Lettuce 0      4     0    4   100  0   100  0   100  0                    
Mustard 0      4     0    4   75   4   90   2   100  0                    
Crabgrass                                                                 
        0      5     0    3   75   3   90   1   100  0                    
Tomato  0      5     0    5   50   3   100  0   100  0                    
Safflower                                                                 
        0      5     0    5   0    5   0    5   0    4                    
Flax    100    0     100  0   100  0   100  0   100  0                    
Wheat   0      5     0    4   0    4   75   3   100  0                    
Peanut  0      5     0    5   0    5   0    5   --   --                   
Soybean 0      5     0    5   0    5   0    4   80   2                    
Cotton  0      5     0    5   0    5   0    5   0    5                    
Rice    0      5     0    5   0    5   0    4   20   4                    
Sorghum 0      5     0    5   0    5   100  0   75   3                    
Barnyard-                                                                 
grass   0      5     0    5   80   2   100  0   100  0                    
Sicklepod                                                                 
        0      5     0    5   0    5   0    5   20   4                    
Morning-                                                                  
glory   0      5     0    5   25   4   100  0   100  0                    
Nutsedge                                                                  
        0      5     0    5   0    5   0    5   0    5                    
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               

              TABLE 17                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON PREEMERGENCE                               
PERFORMANCE OF 6-CYCLOPROPYLAMINO-2-DIETHYL-                              
AMINO-4-METHOXY-5-PYRIMIDINE-CARBONITRILE                                 
(Example LV)*                                                             
1.12 kg/ha    2.24 kg/ha                                                  
                        4.48 kg/ha                                        
                                  8.96 kg/ha                              
Crop    K.sup.a   K       V   K     V   K     V                           
______________________________________                                    
Lima Bean                                                                 
        0         0       5   0     5   0     4                           
Corn    0         0       5   0     5   0     5                           
Wild Oats                                                                 
        0         0       5   0     4   90    2                           
Lettuce 0         0       4   100   0   100   0                           
Mustard 0         0       4   90    1   100   0                           
Crabgrass                                                                 
        0         100     0   100   0   100   0                           
Nutsedge                                                                  
        0         0       5   0     5   0     5                           
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               
 .sup.a Surviving plants expected to recover.                             

              TABLE 18                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON PREEMERGENCE                               
PERFORMANCE OF 2-CYCLOPROPYLAMINO-6-ISO-                                  
PROPYLAMINO-4-METHOXY-5-PYRIMIDINE-                                       
CARBONITRILE (Example LVIII)*                                             
2.24 kg/ha       4.48 kg/ha  8.96 kg/ha                                   
Crop    K.sup.a      K       V     K     V                                
______________________________________                                    
Lima Bean                                                                 
        0            0       5     0     5                                
Corn    0            0       5     0     5                                
Wild Oats                                                                 
        0            0       5     0     5                                
Lettuce 0            75      2     75    2                                
Mustard 0            0       4     75    2                                
Crabgrass                                                                 
        0            100     0     100   0                                
Nutsedge                                                                  
        0            0       5     0     5                                
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               
 .sup.a Surviving plants expected to recover.                             

              TABLE 19                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON PREEMERGENCE                               
PERFORMANCE OF 2,6-BIS(CYCLOPROPYLAMINO)-4-                               
METHOXY-5-PYRIMIDINECARBONITRILE (Example LIX)*                           
0.56 kg/ha    1.12 kg/ha                                                  
                        2.24 kg/ha                                        
                                  4.48 kg/ha                              
Crop    K.sup.a   K       V   K     V   K     V                           
______________________________________                                    
Lima Bean                                                                 
        0         0       4   0     4   100   0                           
Corn    0         0       5   0     5   30    2                           
Wild Oats                                                                 
        0         25      4   25    4   100   0                           
Lettuce 0         10      0   100   0   100   0                           
Mustard 0         0       4   50    2   100   0                           
Crabgrass                                                                 
        0         100     0   100   0   100   0                           
Nutsedge                                                                  
        0         0       5   0     5   0     5                           
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               
 .sup.a Surviving plants expected to recover.                             

              TABLE 20                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON PREEMERGENCE                               
PERFORMANCE OF 6-CYCLOPROPYLAMINO-4-                                      
METHOXY-2-(1-METHYLPROPYLAMINO)-5-PYRIMIDINE-                             
CARBONITRILE (Example LX)*                                                
        0.56 kg/ha                                                        
                  1.12 kg/ha  2.24 kg/ha                                  
Crop      K.sup.a     K       V     K    V                                
______________________________________                                    
Lima Bean 0           0       5     0    4                                
Corn      0           0       5     0    5                                
Wild Oats 0           0       5     20   4                                
Lettuce   0           40      4     80   3                                
Mustard   0           100     0     95   2                                
Crabgrass 10          30      4     40   3                                
Soybean   0           0       5     0    5                                
Sorghum   0           0       5     0    5                                
Sesbania  0           0       5     60   4                                
Sicklepod 0           0       5     20   4                                
Green Foxtail                                                             
          50          50      4     90   2                                
Peanuts   0           0       5     0    5                                
Cotton    0           0       5     0    5                                
Barnyardgrass                                                             
          0           0       4     30   3                                
Johnsongrass                                                              
          0           20      4     0    4                                
Downeybrome                                                               
          10          10      4     20   4                                
Morningglory                                                              
          0           0       5     0    5                                
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               
 .sup.a Surviving plants expected to recover.                             

              TABLE 21                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON PREEMERGENCE                               
PERFORMANCE OF 4-METHOXY-6-(1-METHYLETHYL-                                
AMINO)-2-(2-METHYLPROPYLAMINO)-5-PYRIMIDINE-                              
CARBONITRILE (Example LXI)*                                               
          0.56 kg/ha   1.12 kg/ha                                         
                                 2.24 kg/ha                               
Crop      K.sup.a      K.sup.a   K.sup.a                                  
______________________________________                                    
Lima Bean 0            0         0                                        
Corn      0            0         0                                        
Wild Oats 0            0         0                                        
Lettuce   0            10        60                                       
Mustard   0            0         50                                       
Crabgrass 0            60        40                                       
Soybean   O            O         O                                        
Sorghum   0            0         0                                        
Sesbania  0            0         50                                       
Sicklepod 0            0         0                                        
Green Foxtail                                                             
          0            0         50                                       
Peanuts   0            0         0                                        
Cotton    0            0         0                                        
Barnyardgrass                                                             
          0            0         0                                        
Johnsongrass                                                              
          0            0         0                                        
Downeybrome                                                               
          0            0         0                                        
Morningglory                                                              
          0            0         0                                        
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               
 .sup.a Surviving plants expected to recover.
In the same way, the effect of the amount of active compound applied per hectare upon performance as a postemergence herbicide was determined for several of the herbicidal 5-pyrimidinecarbonitriles. The results appear in Tables 22-43.
              TABLE 22                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON POST-                                      
EMERGENCE PERFORMANCE OF 2-(1-CYANO-1-                                    
METHYLPROPYLAMINO)-6-ISOPROPYLAMINO-4-                                    
METHOXY-5-PYRIMIDINECARBONITRILE                                          
(Example XXXIV)*                                                          
0.28 kg/     0.56 kg/ 1.12 kg/ 2.24 kg/                                   
                                      4.48 kg/                            
ha           ha       ha       ha     ha                                  
Crop    K      V     K    V   K    V   K    V   K    V                    
______________________________________                                    
Lima Bean                                                                 
        0      5     0    4   50   4   100  0   100  0                    
Corn    0      5     0    5   0    5   0    5   0    4                    
Wild Oats                                                                 
        0      5     0    5   0    4   10   4   30   4                    
Lettuce 100    0     100  0   100  0   100  0   100  0                    
Mustard 60     2     100  0   100  0   100  0   100  0                    
Crabgrass                                                                 
        50     4     100  0   100  0   100  0   100  0                    
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               

              TABLE 23                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON POST-                                      
EMERGENCE PERFORMANCE OF 2-(1-CYANO-1-                                    
METHYLETHYLAMINO)-6-ISOPROPYLAMINO-4-                                     
METHOXY-5-PYRIMIDINECARBONITRILE                                          
(Example XXXV)*                                                           
                                    2.24                                  
        0.28 kg/ha                                                        
                0.56 kg/ha                                                
                          1.12 kg/ha                                      
                                    kg/ha                                 
Crop      K      V      K    V    K    V    K    V                        
______________________________________                                    
Lima Bean 0      4      0    4    25   4    100  0                        
Corn      0      5      0    5    30   4    60   3                        
Wild Oat  0      5      0    5    0    5    50   4                        
Sugarbeet 50     4      100  0    100  0    100  0                        
Onion     80     2      100  0    100  0    100  0                        
Green Foxtail                                                             
          75     4      100  0    100  0    100  0                        
Soybean   0      5      0    4    50   4    100  0                        
Cotton    0      5      0    5    0    5    0    5                        
Sorghum   0      5      0    5    0    4    0    4                        
Sicklepod 0      4      0    4    0    4    50   4                        
Barley    0      5      0    5    0    4    100  0                        
Barnyardgrass                                                             
          20     4      20   4    80   2    100  0                        
Peanut    0      5      0    5    0    5    0    4                        
Safflower 100    0      100  0    100  0    100  0                        
Tomato    100    0      100  0    100  0    100  0                        
Flax      0      4      80   3    100  0    100  0                        
Rice      0      5      80   4    90   2    100  0                        
Wheat     0      5      0    4    30   4    100  0                        
Nutsedge  0      5      0    5    0    5    0    5                        
Lettuce   --     --     100  0    100  0    --   --                       
Mustard   --     --     100  0    100  0    --   --                       
Crabgrass --     --     100  0    100  0    --   --                       
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               

              TABLE 24                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON POST-                                      
EMERGENCE PERFORMANCE OF 2-(1-CYANO-1-                                    
METHYLETHYLAMINO)-6-ETHYLAMINO-4-                                         
METHOXY-5-PYRIMIDINECARBONITRILE                                          
(Example XXXIII)*                                                         
0.14         0.28     0.56     1.12   2.24                                
kg/ha        kg/ha    kg/ha    kg/ha  kg/ha                               
CROP    K      V     K    V   K    V   K    V   K    V                    
______________________________________                                    
Lima Bean                                                                 
        0      5     0    5   0    5   75   4   100  0                    
Corn    0      5     0    5   0    5   0    4   100  0                    
Wild Oats                                                                 
        0      5     0    5   0    5   50   4   100  0                    
Sugarbeet                                                                 
        75     3     100  0   100  0   100  0   100  0                    
Onion   100    0     100  0   100  0   100  0   100  0                    
Green   100    0     100  0   100  0   100  0   100  0                    
Foxtail                                                                   
Soybean 0      4     0    4   20   4   90   2   100  0                    
Cotton  0      5     0    5   0    5   0    5   0    4                    
Sorghum 0      5     0    5   0    5   0    5   0    4                    
Sicklepod                                                                 
        0      4     0    4   50   4   75   4   100  0                    
Barley  0      4     0    4   10   4   100  0   100  0                    
Barnyard-                                                                 
        0      5     30   4   50   4   100  0   100  0                    
grass                                                                     
Peanut  0      5     0    5   0    5   100  0   100  0                    
Safflower                                                                 
        60     4     75   3   100  0   100  0   100  0                    
Tomato  75     4     100  0   100  0   100  0   100  0                    
Flax    0      4     100  0   100  0   100  0   100  0                    
Rice    10     4     20   4   80   2   100  0   100  0                    
Wheat   0      5     0    5   0    5   75   4   100  0                    
Nutsedge                                                                  
        0      5     0    5   0    5   0    5   0    5                    
Lettuce --     --    100  0   100  0   100  0   100  0                    
Mustard --     --    100  0   100  0   100  0   100  0                    
Crabgrass                                                                 
        --     --    80   4   100  0   100  0   100  0                    
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               

              TABLE 25                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON POST-                                      
EMERGENCE PERFORMANCE OF 6-ETHYLAMINO-2-                                  
ISOPROPYLAMINO-4-METHOXY-5-PYRIMIDINE-                                    
CARBONITRILE (Example XXXVI)*                                             
0.56         1.12     2.24     4.48   8.96                                
kg/ha        kg/ha    kg/ha    kg/ha  kg/ha                               
CROP    K      V     K    V   K    V   K    V   K    V                    
______________________________________                                    
Lima Beans                                                                
        0      4     0    4   0    4   0    4   0    3                    
Corn    0      5     0    5   0    5   0    5   0    5                    
Wild Oats                                                                 
        50     3     50   3   100  0   100  0   100  0                    
Lettuce 100    0     100  0   100  0   100  0   100  0                    
Mustard 100    0     100  0   100  0   100  0   100  0                    
Crabgrass                                                                 
        50     3     50   4   90   3   100  0   100  0                    
Nutsedge                                                                  
        0      5     0    5   0    5   0    5   0    5                    
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               

              TABLE 26                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON POST-                                      
EMERGENCE PERFORMANCE OF 6-DIETHYLAMINO-2-                                
ISOPROPYLAMINO-4-METHOXY-5-PYRIMIDINE-                                    
CARBONITRILE (Example XXXIX)*                                             
       0.56 kg/ha                                                         
                1.12 kg/ha                                                
                          2.24 kg/ha                                      
                                    4.48 kg/ha                            
Crop     K      V      K    V    K    V    K    V                         
______________________________________                                    
Lima Beans                                                                
         0      4      0    4    0    4    0    4                         
Corn     0      4      0    4    0    4    0    4                         
Wild Oats                                                                 
         95     1      100  0    100  0    100  0                         
Lettuce  100    0      100  0    100  0    100  0                         
Mustard  100    0      100  0    100  0    100  0                         
Crabgrass                                                                 
         100    0      100  0    100  0    100  0                         
Nutsedge 0      5      0    5    0    5    0    5                         
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               

              TABLE 27                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON POST-                                      
EMERGENCE PERFORMANCE OF 2-ETHYLAMINO-6-                                  
ISOPROPYLAMINO-4-METHOXY-5-PYRIMIDINE-                                    
CARBONITRILE (Example XL)*                                                
0.56         1.12     2.24     4.48   8.96                                
kg/ha        kg/ha    kg/ha    kg/ha  kg/ha                               
Crop    K      V     K    V   K    V   K    V   K    V                    
______________________________________                                    
Lima Beans                                                                
        0      5     0    5   0    5   0    5   0    4                    
Corn    0      5     0    5   0    5   0    5   0    5                    
Wild Oats                                                                 
        0      5     0    5   0    5   0    5   0    4                    
Lettuce 100    0     100  0   100  0   100  0   100  0                    
Mustard 0      5     0    5   0    5   0    5   0    5                    
Crabgrass                                                                 
        0      5     0    5   0    5   0    5   0    5                    
Nutsedge                                                                  
        0      5     0    5   0    5   0    5   0    5                    
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               

              TABLE 28                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON POST-                                      
EMERGENCE PERFORMANCE OF 6-ETHYLAMINO-4-                                  
METHOXY-2-METHYLAMINO-5-PYRIMIDINE-                                       
CARBONITRILE (Example XLII)*                                              
         1.12 kg/ha                                                       
                 2.24 kg/ha  4.48 kg/ha                                   
Crop       K.sup.a   K.sup.a     K     V                                  
______________________________________                                    
Lima Beans 0         0           0     4                                  
Corn       0         0           0     5                                  
Wild Oats  0         0           0     4                                  
Lettuce    0         60          100   0                                  
Mustard    0         20          40    3                                  
Crabgrass  0         0           20    4                                  
Nutsedge   0         0           0     5                                  
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               
 .sup.a Surviving plants expected to recover.                             

              TABLE 29                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON POST-                                      
EMERGENCE PERFORMANCE OF 6-ISOPROPYL-                                     
AMINO-4-METHOXY-2-METHYLAMINO-5-PYRIMIDINE-                               
CARBONITRILE (Example XLIII)*                                             
        2.24 kg/ha                                                        
                 4.48 kg/ha  8.96 kg/ha                                   
Crop      K.sup.a    K       V     K     V                                
______________________________________                                    
Lima Beans                                                                
          0          0       4     0     4                                
Corn      0          0       5     0     5                                
Wild Oats 0          0       5     0     5                                
Lettuce   0          100     0     100   0                                
Mustard   0          100     0     100   0                                
Crabgrass 0          0       5     0     5                                
Nutsedge  0          0       5     0     5                                
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               
 .sup.a Surviving plants expected to recover.                             

              TABLE 30                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON POST-                                      
EMERGENCE PERFORMANCE OF 6-DIETHYLAMINO-2-                                
ETHYLAMINO-4-METHOXY-5-PYRIMIDINE-                                        
CARBONITRILE (Example XLV)*                                               
       1.12 kg/ha                                                         
               2.24 kg/ha                                                 
                         4.48 kg/ha                                       
                                   8.96 kg/ha                             
Crop     K.sup.a   K.sup.a   K     V   K     V                            
______________________________________                                    
Lima Beans                                                                
         0         0         0     4   0     4                            
Corn     0         0         0     5   0     5                            
Wild Oats                                                                 
         0         0         0     5   10    4                            
Lettuce  0         60        100   0   100   0                            
Mustard  0         30        80    2   90    1                            
Crabgrass                                                                 
         0         20        75    2   80    2                            
Nutsedge 0         0         0     5   0     5                            
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 of 5 signifying no chemical injury.                                      
 .sup.a Surviving plants expected to recover.                             

              TABLE 31                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON POST-                                      
EMERGENCE PERFORMANCE OF 4-ETHOXY-6-                                      
DIETHYLAMINO-2-ISOPROPYLAMINO-5-PYRIMIDINE-                               
CARBONITRILE (Example XLVI)*                                              
0.28         0.56     1.12     2.24   4.48                                
kg/ha        kg/ha    kg/ha    kg/ha  kg/ha                               
CROP    K      V     K    V   K    V   K    V   K    V                    
______________________________________                                    
Lima Bean                                                                 
        0      5     0    5   0    5   0    5   0    4                    
Corn    0      5     0    5   0    5   0    5   0    5                    
Wild Oats                                                                 
        0      5     0    5   0    5   0    5   0    4                    
Lettuce 100    0     100  0   100  0   100  0   100  0                    
Mustard 0      5     10   4   10   4   75   2   100  0                    
Crabgrass                                                                 
        0      5     0    4   60   2   85   1   100  0                    
Soybean 0      5     0    5   0    5   0    5   0    5                    
Cotton  0      5     0    5   0    5   0    5   0    5                    
Flax    0      5     0    4   20   4   100  0   100  0                    
Peanut  0      5     0    5   0    5   0    5   0    5                    
Rice    0      5     0    5   0    5   0    4   10   4                    
Sugarbeet                                                                 
        --     --    --   --  0    4   20   3   0    3                    
Rape    0      5     0    5   0    5   0    5   0    5                    
Sorghum 0      5     0    5   0    5   0    5   0    5                    
Barnyard-                                                                 
        0      5     0    5   0    5   0    5   0    5                    
grass                                                                     
Onion   0      4     0    4   10   3   100  0   100  0                    
Safflower                                                                 
        0      5     0    5   0    5   0    5   0    5                    
Prickly 0      5     0    5   0    5   0    4   0    4                    
Sida                                                                      
Morning-                                                                  
        0      5     0    5   0    5   20   4   90   2                    
glory                                                                     
Tomato  0      5     0    4   20   4   80   3   100  0                    
Nutsedge                                                                  
        0      5     0    5   0    5   0    5   0    5                    
______________________________________                                    
 *Entries under K refer to percent kill; under V to plant vigor, a vigor o
 5 signifying no chemical injury.                                         

              TABLE 32                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON POST-                                      
EMERGENCE PERFORMANCE OF 2-(1-CYANO-1-                                    
METHYLETHYLAMINO)-4-METHOXY-6-(1-METHYL-                                  
BUTYLAMINO)-5-PYRIMIDINECARBONITRILE                                      
(Example XLVII)*                                                          
0.28         0.56     1.12     2.24   4.48                                
kg/ha        kg/ha    kg/ha    kg/ha  kg/ha                               
CROP    K      V     K    V   K    V   K    V   K    V                    
______________________________________                                    
Rice    0      5     0    5   0    5   0    5   0    5                    
Flax    100    0     100  0   100  0   100  0   100  0                    
Safflower                                                                 
        0      5     30   4   100  0   100  0   100  0                    
Tomato  0      5     0    5   0    4   100  0   100  0                    
Peanut  0      5     0    5   0    5   0    5   0    5                    
Wheat   0      5     0    5   0    5   0    5   0    5                    
Morning-                                                                  
        0      5     0    5   0    5   0    5   0    4                    
glory                                                                     
Sugarbeet                                                                 
        100    0     100  0   100  0   100  0   100  0                    
Lima Bean                                                                 
        0      5     0    5   0    5   30   4   60   4                    
Corn    0      5     0    5   0    5   0    5   0    5                    
Soybean 0      5     0    5   0    5   0    5   0    5                    
Oats    0      5     0    5   0    5   0    5   0    5                    
Sorghum 0      5     0    5   0    5   0    5   0    5                    
Barley  0      5     0    5   0    5   0    4   0    4                    
Cotton  0      5     0    5   0    5   0    4   0    4                    
Sicklepod                                                                 
        0      5     0    5   0    5   0    5   0    5                    
Barnyard-                                                                 
        0      5     0    5   0    5   0    5   0    5                    
grass                                                                     
Foxtail 0      4     0    4   0    4   0    4   100  0                    
______________________________________                                    
 *Entries under K refer to percent kill; under V to plant vigor, a vigor o
 5 signifying no chemical injury.                                         

              TABLE 33                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON                                            
POSTEMERGENCE PERFORMANCE OF 2-(1-CYANO-1-                                
METHYLETHYLAMINO)-6-(1-ISOPROPYL-2-                                       
METHYLPROPYLAMINO)-4-METHOXY-5-PYRIMIDINE                                 
CARBONITRILE (Example XLVIII)*                                            
              4.48 kg/ha                                                  
                        8.96 kg/ha                                        
Crop          K.sup.a   K.sup.a                                           
______________________________________                                    
Lima Bean     0         0                                                 
Corn          0         0                                                 
Wild Oat      0         0                                                 
Lettuce       0         60                                                
Mustard       0         0                                                 
Crabgrass     0         0                                                 
Nutsedge      0         0                                                 
______________________________________                                    
 *Entries under K refer to percent kill; under V to plant vigor, a vigor o
 5 signifying no chemical injury.                                         
 .sup.a Surviving plants expected to recover.                             

                                  TABLE 34                                
__________________________________________________________________________
2-(1-CYANO-1-METHYLETHYLAMINO)-6-CYCLOPROPYLAMINO-4-                      
METHOXY-5-PYRIMIDINECARBONITRILE (Example XLIX)*                          
        0.14 kg/ha                                                        
              0.28 kg/ha                                                  
                    0.56 kg/ha                                            
                          1.12 kg/ha                                      
                                2.24 kg/ha                                
Crop    K   V K   V K   V K   V K   V                                     
__________________________________________________________________________
Lima Bean                                                                 
        0   5 0   4 80  2 100 0 100 0                                     
Corn    0   5 0   5 0   4 100 0 100 0                                     
Wild Oat                                                                  
        0   5 0   5 0   5 0   4 100 0                                     
Sugarbeet                                                                 
        100 0 100 0 100 0 100 0 100 0                                     
Onion   100 0 100 0 100 0 100 0 100 0                                     
Green Foxtail                                                             
        100 0 100 0 100 0 100 0 100 0                                     
Soybean 0   5 0   5 0   4 100 0 100 0                                     
Cotton  0   5 0   5 10  4 100 0 100 0                                     
Sorghum 0   5 0   5 0   5 75  4 100 0                                     
Sicklepod                                                                 
        0   4 30  4 50  4 100 0 100 0                                     
Barnyardgrass                                                             
        0   5 0   5 100 0 100 0 100 0                                     
Peanut  0   5 0   5 0   4 100 0 80  2                                     
Safflower                                                                 
        80  4 100 0 100 0 100 0 100 0                                     
Tomato  100 0 100 0 100 0 100 0 100 0                                     
Flax    75  4 100 0 100 0 100 0 100 0                                     
Rice    10  4 100 0 100 0 100 0 100 0                                     
Wheat   0   5 10  4 75  4 100 0 100 0                                     
Nutsedge                                                                  
        0   5 0   5 0   4 0   4 0   4                                     
Lettuce --  --                                                            
              --  --                                                      
                    100 0 100 0 100 0                                     
Mustard --  --                                                            
              --  --                                                      
                    100 0 100 0 100 0                                     
Crabgrass                                                                 
        --  --                                                            
              --  --                                                      
                    100 0 100 0 100 0                                     
__________________________________________________________________________
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 rating of 5 signifying no chemical injury.                               

                                  TABLE 35                                
__________________________________________________________________________
EFFECT OF APPLICATION LEVEL ON POSTEMERGENCE PER-                         
FORMANCE OF 6-AMINO-2-(1-CYANO-1-METHYLETHYLAMINO)-4-                     
METHOXY-5-PYRIMIDINECARBONITRILE (Example L)*                             
0.56 kg/ha   1.12 kg/ha                                                   
                   2.24 kg/ha                                             
                          4.48 kg/ha                                      
                                8.96 kg/ha                                
Crop  K   V  K   V K   V  K   V K                                         
__________________________________________________________________________
Lima Bean                                                                 
      30  4  75  3 100 0  100 0 100                                       
Corn  0   5  0   5 0   4  0   4 100                                       
Wild oat                                                                  
      0   5  10  4 50  3  100 0 100                                       
Lettuce                                                                   
      100 0  100 0 100 0  100 0 100                                       
Mustard                                                                   
      20  4  100 0 100 0  100 0 100                                       
Crabgrass                                                                 
      0   5  0   5 0   4  100 0 100                                       
Nutsedge                                                                  
      0   5  0   5 0   4  0   4 100                                       
__________________________________________________________________________
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 of 5 signifying no chemical injury.                                      

                                  TABLE 36                                
__________________________________________________________________________
EFFECT OF APPLICATION LEVEL ON POSTEMERGENCE PER-                         
FORMANCE OF 6-BUTYLAMINO-2-(1-CYANO-1-METHYLETHY-                         
LAMINO)-4-METHOXY-5-PYRIMIDINECARBONITRILE (Example LI)*                  
        0.28 kg/ha                                                        
              0.56 kg/ha                                                  
                    1.12 kg/ha                                            
                          2.24 kg/ha                                      
                                4.48 kg/ha                                
Crop    K   V K   V K   V K   V K   V                                     
__________________________________________________________________________
Lima Bean                                                                 
        0   4 0   4 50  3 100 0 100 0                                     
Corn    0   5 0   5 0   5 0   5 0   5                                     
Wild Oat                                                                  
        0   5 0   5 0   5 0   5 0   5                                     
Lettuce 100 0 100 0 100 0 100 0 100 0                                     
Mustard 0   5 0   4 75  3 100 0 100 0                                     
Crabgrass                                                                 
        0   5 0   5 0   5 90  2 100 0                                     
Nutsedge                                                                  
        0   5 0   5 0/ 5                                                  
                        0 5   0 5                                         
Morningglory                                                              
        0   5 0   4 20  4 100 0 100 0                                     
Peanut  0   5 0   5 0   5 0   5 0   5                                     
Soybean 0   5 0   5 0   5 0   5 60  2                                     
Sicklepod                                                                 
        0   5 0   5 0   5 0   4 0   4                                     
Barley  0   5 0   5 0   5 0   4 0   4                                     
Wheat   0   5 0   5 0   5 0   5 0   4                                     
Flax    0   5 0   5 75  4 100 0 100 0                                     
Safflower                                                                 
        0   5 0   5 0   5 0   5 0   5                                     
Lambsquarter                                                              
        90  2 90  2 100 0 100 0 100 0                                     
Barnyardgrass                                                             
        0   5 0   5 0   5 0   5 0   5                                     
Green Foxtail                                                             
        0   4 30  4 100 0 100 0 100 0                                     
Tomato  60  4 60  4 100 0 100 0 100 0                                     
__________________________________________________________________________
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 of 5 signifying no chemical injury.                                      

              TABLE 37                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON                                            
POSTEMERGENCE PERFORMANCE OF 2-(1-CYANO-1-                                
METHYLPROPYLAMINO)-6-CYCLOPROPYLAMINO-4-                                  
METHOXY-5-PYRIMIDINECARBONITRILE (Example LII)*                           
       0.56 kg/ha                                                         
               1.12 kg/ha                                                 
                         2.24 kg/ha                                       
                                   4.48 kg/ha                             
Crop     K       V     K     V   K     V   K     V                        
______________________________________                                    
Lima Bean                                                                 
         0       4     75    3   100   0   100   0                        
Corn     0       5     0     5   0     5   0     5                        
Wild Oat 0       5     0     5   0     5   50    4                        
Lettuce  100     0     100   0   100   0   100   0                        
Mustard  100     0     100   0   100   0   100   0                        
Crabgrass                                                                 
         100     0     100   0   100   0   100   0                        
Tomato   100     0     100   0   100   0   100   0                        
Flax     90      1     100   0   100   0   100   0                        
Wheat    0       5     0     5   20    4   100   0                        
Safflower                                                                 
         100     0     100   0   100   0   100   0                        
Peanut   0       5     0     5   0     5   0     5                        
Soybean  0       5     20    4   100   0   100   0                        
Cotton   0       4     25    4   100   0   100   0                        
Rice     0       5     0     5   100   0   100   0                        
Sorghum  0       5     0     5   100   0   100   0                        
Sicklepod                                                                 
         20      4     20    4   75    4   90    2                        
Barnyard-                                                                 
grass    40      3     100   0   100   0   100   0                        
Morningglory                                                              
         25      4     100   0   100   0   100   0                        
Nutsedge 0       5     0     5   0     5   50    4                        
______________________________________                                    
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 of 5 signifying no chemical injury.                                      

                                  TABLE 38                                
__________________________________________________________________________
EFFECT OF APPLICATION LEVEL ON POSTEMERGENCE PER-                         
FORMANCE OF 6-CYCLOPROPYLAMINO-2-ISOPROPYLAMINO-4-                        
METHOXY-5-PYRIMIDINECARBONITRILE (Example LIV)*                           
        0.14 kg/ha                                                        
              0.28 kg/ha                                                  
                    0.56 kg/ha                                            
                          1.12 kg/ha                                      
                                2.24 kg/ha                                
Crop    K   V K   V K   V K   V K   V                                     
__________________________________________________________________________
Lima Bean                                                                 
        0   4 50  3 50  3 100 0 100 0                                     
Corn    0   5 0   5 0   5 0   4 0   4                                     
Wild Oat                                                                  
        0   5 0   4 100 0 100 0 100 0                                     
Lettuce 100 0 100 0 100 0 100 0 100 0                                     
Mustard 75  2 80  2 100 0 100 0 100 0                                     
Crabgrass                                                                 
        50  4 50  4 100 0 100 0 100 0                                     
Tomato  100 0 100 0 100 0 100 0 100 0                                     
Safflower                                                                 
        100 0 100 0 100 0 100 0 100 0                                     
Flax    100 0 100 0 100 0 100 0 100 0                                     
Wheat   10  4 20  4 50  4 100 0 100 0                                     
Peanut  0   5 0   5 0   5 0   5 0   5                                     
Soybean 0   4 25  4 25  4 100 0 100 0                                     
Cotton  0   5 0   5 0   4 50  4 90  2                                     
Rice    0   5 0   4 25  4 100 0 100 0                                     
Sorghum 0   5 0   5 0   4 100 0 100 0                                     
Barnyardgrass                                                             
        0   4 50  3 100 0 100 0 100 0                                     
Sicklepod                                                                 
        0   4 75  3 100 0 100 0 100 0                                     
Morningglory                                                              
        0   4 0   4 100 0 100 0 100 0                                     
Nutsedge                                                                  
        0   5 0   5 0   5 0   5 0   5                                     
__________________________________________________________________________
 *Entries under K refer to percent kill; under V, to plant vigor, a vigor 
 of 5 signifying no chemical injury.                                      

                                  TABLE 39                                
__________________________________________________________________________
EFFECT OF APPLICATION LEVEL ON POSTEMERGENCE PER-                         
FORMANCE OF 6-CYCLOPROPYLAMINO-2-DIETHYLAMINO-4-                          
METHOXY-5-PYRIMIDINECARBONITRILE (Example LV)*                            
0.56 kg/ha   1.12 kg/ha                                                   
                   2.24 kg/ha                                             
                          4.48 kg/ha                                      
                                8.96 kg/ha                                
Crop  K   V  K   V K   V  K   V K   V                                     
__________________________________________________________________________
Lima Bean                                                                 
      0   5  0   5 0   5  0   4 0   3                                     
Corn  0   5  0   5 0   5  0   5 0   5                                     
Wild Oats                                                                 
      100 0  100 0 100 0  100 0 100 0                                     
Lettuce                                                                   
      100 0  100 0 100 0  100 0 100 0                                     
Mustard                                                                   
      75  4  100 0 100 0  100 0 100 0                                     
Crabgrass                                                                 
      25  4  50  4 100 0  100 0 100 0                                     
Nutsedge                                                                  
      0   5  0   5 0   5  0   5 0   5                                     
__________________________________________________________________________
 *Entries under K refer to percent kill; under V to plant vigor, a vigor o
 5 signifying no chemical injury.                                         

                                  TABLE 40                                
__________________________________________________________________________
EFFECT OF APPLICATION LEVEL ON POSTEMERGENCE PER-                         
FORMANCE OF 2-CYCLOPROPYLAMINO-6-ISOPROPYLAMINO-4-                        
METHOXY-5-PYRIMIDINECARBONITRILE (Example LVIII)*                         
0.56 kg/ha   1.12 kg/ha                                                   
                   2.24 kg/ha                                             
                          4.48 kg/ha                                      
                                8.96 kg/ha                                
Crop  K   V  K   V K   V  K   V K   V                                     
__________________________________________________________________________
Lima Bean                                                                 
      0   4  0   4 0   4  0   4 0   4                                     
Corn  0   5  0   5 0   5  0   5 0   5                                     
Wild Oats                                                                 
      0   5  0   5 0   5  0   5 20  4                                     
Lettuce                                                                   
      100 0  100 0 100 0  100 0 100 0                                     
Mustard                                                                   
      75  2  75  2 75  2  90  1 100 0                                     
Crabgrass                                                                 
      0   5  0   4 0   3  0   3 0   3                                     
Nutsedge                                                                  
      0   5  0   5 0   5  0   5 0   5                                     
__________________________________________________________________________
 *Entries under K refer to percent kill; under V to plant vigor, a vigor o
 5 signifying no chemical injury.                                         

              TABLE 41                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON                                            
POSTEMERGENCE PERFORMANCE OF 2,6-BIS                                      
(CYCLOPROPYLAMINO)-4-METHOXY-5-PYRIMIDINE-                                
CARBONITRILE (Example LIX)*                                               
       0.56 kg/ha                                                         
                 1.12 kg/ha  2.24 kg/ha                                   
Crop     K       V       K     V     K     V                              
______________________________________                                    
Lima Bean                                                                 
         100     0       100   0     100   0                              
Corn     0       5       0     5     0     4                              
Wild Oats                                                                 
         0       4       50    3     100   0                              
Lettuce  100     0       100   0     100   0                              
Mustard  75      3       100   0     100   0                              
Crabgrass                                                                 
         0       4       100   0     100   0                              
Nutsedge 0       5       0     5     0     5                              
______________________________________                                    
 *Entries under K refer to percent kill; under V to plant vigor, a vigor o
 5 signifying no chemical injury.                                         

                                  TABLE 42                                
__________________________________________________________________________
EFFECT OF APPLICATION LEVEL ON POSTEMERGENCE PER-                         
FORMANCE OF 6-CYCLOPROPYLAMINO-4-METHOXY-2-(1-                            
METHYLPROPYLAMINO)-5-PYRIMIDINECARBONITRILE                               
(Example LX)*                                                             
        0.14 kg/ha                                                        
              0.28 kg/ha                                                  
                    0.56 kg/ha                                            
                          1.12 kg/ha                                      
                                2.24 kg/ha                                
Crop    K   V K   V K   V K   V K   V                                     
__________________________________________________________________________
Lima Bean                                                                 
        60  3 60  3 80  2 80  2 100 0                                     
Corn    0   5 0   5 0   5 0   4 0   4                                     
Wild Oats                                                                 
        0   4 20  3 80  2 70  2 90  2                                     
Lettuce 100 0 100 0 100 0 100 0 100 0                                     
Mustard 60  3 80  3 100 0 100 0 100 0                                     
Crabgrass                                                                 
        20  4 60  4 60  2 70  2 100 0                                     
Soybean 0   4 50  3 30  3 80  3 80  3                                     
Sorghum 0   3 0   3 20  3 20  3 70  3                                     
Sesbania                                                                  
        100 0 100 0 100 0 100 0 100 0                                     
Sicklepod                                                                 
        60  3 100 0 100 0 100 0 100 0                                     
Green Foxtail                                                             
        100 0 70  3 100 0 100 0 100 0                                     
Peanuts 0   4 0   4 0   3 0   3 100 0                                     
Cotton  70  3 80  3 80  3 100 0 100 0                                     
Barnyardgrass                                                             
        0   3 60  3 60  3 100 0 100 0                                     
Johnsongrass                                                              
        40  4 50  4 70  3 70  3 95  2                                     
Downeybrome                                                               
        0   4 95  3 90  3 100 0 100 0                                     
Morningglory                                                              
        0   4 0   4 0   3 100 0 100 0                                     
__________________________________________________________________________
 *Entries under K refer to percent kill; under V to plant vigor, a vigor o
 5 signifying no chemical injury.                                         

              TABLE 43                                                    
______________________________________                                    
EFFECT OF APPLICATION LEVEL ON                                            
POSTEMERGENCE PERFORMANCE OF 4-METHOXY-6-                                 
(1-METHYLETHYLAMINO)-2-(2-METHYLPROPY-                                    
LAMINO)-5-PYRIMIDINECARBONITRILE (Example LXI)*                           
         0.14 kg/ha                                                       
                  0.28 kg/ha 0.56 kg/ha                                   
Crop       K      V       K     V    K     V                              
______________________________________                                    
Lima Bean  0      4       0     3    0     3                              
Corn       0      5       0     5    0     5                              
Wild Oats  0      4       0     4    20    3                              
Lettuce    0      4       20    4    100   0                              
Mustard    0      4       0     4    30    3                              
Crabgrass  20     3       30    3    70    3                              
Soybean    0      5       0     4    0     3                              
Sorghum    0      5       0     5    0     4                              
Sesbania   95     2       100   0    100   0                              
Sicklepod  0      4       30    3    30    3                              
Green Foxtail                                                             
           95     3       95    2    90    3                              
Peanuts    0      4       0     4    0     4                              
Cotton     0      5       0     4    0     5                              
Barnyardgrass                                                             
           0      5       0     4    0     3                              
Johnsongrass                                                              
           0      5       0     4    20    4                              
Downeybrome                                                               
           0      4       0     4    30    3                              
Morningglory                                                              
           0      5       0     5    0     5                              
______________________________________                                    
 *Entries under K refer to percent kill; under V to plant vigor, a vigor o
 5 signifying no chemical injury.
The following herbicidal 5-pyrimidinecarbonitriles are prepared by the methods described above. In general, although these compounds exhibit herbicidal activity, a number of them are not as effective as the preferred active compounds: 6-amino-2-ethylamino-4-methoxy-5-pyrimidinecarbontrile, 2-(1-cyano-1-methylethylamino)-4-methoxy-6-propylamino-5-pyrimidinecarbonitrile, 6-cyclopropylamino-2-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile, 2-diethylamino-4-methoxy-6-methylamino-5-pyrimidinecarbonitrile, 2-diethylamino-6-dimethylamino-4-methoxy-5-pyrimidinecarbonitrile, 2-ethylamino-4-methoxy-6-propylamino-5-pyrimidinecarbonitrile, 2-diethylamino-4-methoxy-6-propylamino-5-pyrimidinecarbonitrile, 2-ethylamino-4-methoxy-6-methylamino-5-pyrimidinecarbonitrile, 6-dimethylamino-2-ethylamino-4-methoxy-5-pyrimidinecarbonitrile, 6-isopropylamino-4-methoxy-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile, 2-isopropylamino-4-methoxy-6-(1-methylpropylamino)-5-pyrimidinecarbonitrile, 2-isopropylamino-4-methoxy-6-propylamino-5-pyrimidinecarbonitrile, 2-isopropylamino-4-methoxy-6-(2-methylpropylamino)-5-pyrimidinecarbonitrile, 6-ethylamino-4-methoxy-2-methylethylamino-5-pyrimidinecarbonitrile, 4-ethoxy-6-ethylamino-2-(1-cyano-1-methylethylamino)-5-pyrimidinecarbonitrile, 6-ethylamino-4-methoxy-2-(2-methylpropylamino)-5-pyrimidinecarbonitrile, 2-(1 -cyano-1-methylpropylamino)-4-ethoxy-6-isopropylamino-5-pyrimidinecarbonitrile, 2,6-diethylamino-4-isopropoxy-5-pyrimidinecarbonitrile, 6-ethylamino-4-methoxy-2-(1-methylpropylamino)-5-pyrimidinecarbonitrile, 2-amino-6-ethylamino-4-methoxy-5-pyrimidinecarbonitrile, 2-amino-6-cyclopropylamino-4-methoxy-5-pyrimidinecarbonitrile, and 2-amino-6-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile.
The active 5-pyrimidinecarbonitriles of this invention may be utilized in diverse formulations to produce the herbicidal compositions contemplated herein. The herbicidal compositions contain between about 0.5% and 95% active 5-pyrimidinecarbonitrile, together with between about 4% and 98.5% agriculturally acceptable carrier, and between about 1% and 15% surfactant, by weight. As is well known in the art, the formulation and mode of application of an herbicidal composition may affect its activity in a given application. Thus, the herbicidal 5-pyrimidinecarbonitriles disclosed herein may be formulated into granules, wettable powders, emulsifiable concentrates, solutions, or other known forms, depending on the mode of application.
Granular formulations are particularly useful for aerial application. These formulations may be of several types. Large particles of an absorbent carrier such as attapulgite or kaolin clay, corncobs, expanded mica, and so forth, may be impregnated with solutions of the active compounds. The active 5-pyrimidinecarbonitriles in solution or as a slurry may also be sprayed onto the surface of the absorbent particles. The core of the particle may be watersoluble or insoluble. A particularly useful type of particle is one in which a wettable powder is applied as a surface coating to an insoluble granule such that the wettable powder may be dispersed on contact with moisture. Granules may be produced by compacting dusts or powders, by extrusion through a die, or by use of a granulating disk. Granular formulations may vary widely in concentration, containing as little as 0.5% or as much as about 20% active compound.
Wettable powders in the form of finely divided particls, which disperse readily in water or other dispersants, are useful formulations for both preemergence and postemergence herbicides. A wettable powder typically contains a carrier such as a readily wetted inorganic diluent; for example, Fuller's earth, kaolin clays or silicas mixed with about 5% to 80%, but preferably at least 50%, herbicidally active compound and lesser amounts of surfactants.
Emulsifiable concentrates, which are homogeneous liquid or paste compositions dispersible in water or other dispersants, may consist entirely of the active 5-pyrimidinecarbonitriles of this invention together with a liquid or solid surfactant. They may also contain agriculturally acceptable liquid carriers such as xylene, naptha, isophorone or other organic solvents.
Typical surfactants used in agricultural formulations include, for example, the alkyl and aralkyl sulfonates and sulfates and their sodium salts, polyethylene oxides, sulfonated oils, fatty acid esters of polyhydric alcohols, and other types of surface active agents, many of which are available in commerce. Surfactants, when used, normally comprise from about 1% to 15% by weight of the herbicidal composition.
The herbicidal compositions of this invention may be applied without further dilution or as dilute solutions, emulsions, or suspensions in water or other suitable diluents. The herbicidal compositions may be applied to the area wherein control is desired by spraying the compositions onto the undesired vegetation or the surface of the soil if they are liquids, or by distribution from mechanical equipment in the case of solids. The surface-applied material may also be blended into the upper layer of soil by cultivation, or left as applied in order to gain the optimum results.
The herbically active compounds of this invention may be formulated and applied together with insecticides, fungicides, nematicides, fertilizers and other agricultural chemicals. In formulating and applying the herbicidal compositions of this invention, either alone or with other agricultural chemicals, herbicidally effective amounts of the active compounds are employed. The amount constituting an effective amount is variable, but generally, a uniform application of between about 0.1 and 9 kilograms per hectare is effective, for example, 0.28 to 4.48 kilograms per hectare.
It will be apparent to those skilled in the art that various modifications may be made in the formulation of the herbicidal compositions of this invention, and in their application, without departing from the scope and spirit of this invention as defined in the following claims:

Claims (21)

    I claim: .[.1. A chemical compound having the structural formula ##STR3## wherein
  1. amino..]. .[.2. A chemical compound of claim 1 wherein the halogen is
  2. chlorine..]. 3. A chemical compound having the structural formula ##STR4## wherein (a) R2 is a radical selected from amino, lower alkylamino, lower cycloalkylamino, di(lower alkyl)amino, and [alpha-cyano(lower alkyl)]amino;
    (b) R4 is a lower alkoxy radical; and
    (c) R6 is a radical selected from amino, lower alkylamino, lower cycloalkylamino, and di(lower alkyl)amino;
    with the proviso that neither R2 nor R6 is tert-butylamino; and provided further that when R2 is isopropylamino, R6 is other than n-butylamino; and when R2 is methylethylamino, R6 is other than isopropylamino; and when R2 is diethylamino, R6 is other
  3. than amino. 4. A chemical compound of claim 3 wherein R2 is selected from lower alkylamino (except tert-butylamino) and [alpha-cyano-(lower alkyl)]amino; and R6 is selected from lower alkylamino (except
  4. tert-butylamino) and lower cycloalkylamino. 5. A chemical compound of claim 4 wherein R2 is selected from ethylamino, isopropylamino, 1-methylpropylamino, 2-methylpropylamino, and 1-cyano-1-methylethylamino; R4 is methoxy or ethoxy; and R6 is selected from ethylamino,
  5. isopropylamino and cyclopropylamino. 6. The chemical compound of claim 5 which is 2-(1-cyano-1-methylethylamino)-6-ethylamino-4-methoxy-5-pyrimidinecarbonit
  6. rile. 7. The chemical compound of claim 5 which is 2-(1-cyano-1-methylethylamino)-6-cyclopropyl-amino-4-methoxy-5-pyrimidinec
  7. arbonitrile. 8. The chemical compound of claim 5 which is 2-(1-cyano-1-methylethylamino)-6-isopropylamino-4-methoxy-5-pyrimidinecarb
  8. onitrile. 9. An herbicidal composition comprising an herbicidally effective amount of at least one of the chemical compounds of claim 3 in admixture
  9. with an agriculturally acceptable carrier and a surfactant. 10. An herbicidal composition of claim 9 wherein R2 is selected from lower alkylamino (except tert-butylamino) and [alpha-cyano(lower alkyl)]amino; and R6 is selected from lower alkylamino (except tert-butylamino) and
  10. lower cycloalkylamino. 11. An herbicidal composition of claim 10 wherein R2 is selected from ethylamino, isopropylamino, 1-methylpropylamino, 2-methylpropylamino, and 1-cyano-1-methylethylamino; R4 is methoxy or ethoxy; and R6 is selected from ethylamino, isopropylamino and
  11. cyclopropylamino. 12. An herbicidal composition of claim 11 in which the chemical compound is 2-(1-cyano-1-methylethylamino)-6-ethylamino-4-methoxy-5-pyrimidinecarbonit
  12. rile. 13. An herbicidal composition of claim 11 in which the chemical compound is 2-(1-cyano-1-methylethylamino)-6-cyclopropylamino-4-methoxy-5-pyrimidineca
  13. rbonitrile. 14. An herbicidal composition of claim 11 in which the chemical compound is 2-(1-cyano-1-methylethylamino)-6-isopropylamino-4-methoxy-5-pyrimidinecarb
  14. ontrile. 15. A method of controlling plant growth which comprises applying to the locus of the plants an herbicidally effective amount of a chemical
  15. compound of claim 3. 16. A method of claim 15 wherein the chemical compound is selected from 2-(1-cyano-1-methylethylamino)-6-isopropylamino-4-methoxy-5-pyrimidinecarbonitrile, 2-(1-cyano-1-methylethylamino)-6-ethylamino-4-methoxy-5-pyrimidinecarbonitrile, and 2-(1-cyano-1-methylethylamino)-6-cyclopropylamino-4-methoxy-5-pyrimidineca
  16. rbonitrile. 17. A method of claim 16 wherein the growth of weeds is controlled without substantially affecting Zea mays in the same locus.
  17. A method of claim 16 wherein the growth of weeds is controlled without
  18. substantially affecting Gossypium hirsutum in the same locus. 19. The method of claim 18 wherein the chemical compound is 2-(1-cyano-1-methylethylamino)-6-isopropylamino-4-methoxy-5-pyrimidinecarb
  19. onitrile. 20. A method of claim 16 wherein the growth of weeds is controlled without substantially affecting Sorghum vulgare in the same
  20. locus. 21. A method of claim 16 wherein the growth of weeds is controlled
  21. without substantially affecting Glycine max in the same locus. 22. A method of claim 16 wherein the growth of weeds is controlled without substantially affecting Arachis hypogaea in the same locus.
US06/176,615 1976-08-27 1980-08-08 Herbicidal 5-pyrimidinecarbonitriles Expired - Lifetime USRE31136E (en)

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