WO1987003782A1

WO1987003782A1 - Herbicidal aryl triazolinones

Info

Publication number: WO1987003782A1
Application number: PCT/US1986/002660
Authority: WO
Inventors: George Theodoridis
Original assignee: Fmc Corporation
Priority date: 1985-12-20
Filing date: 1986-12-10
Publication date: 1987-07-02
Also published as: PL151026B1; EP0294375B1; IL80963A0; JPH0533951B2; DK431187D0; KR880700636A; CN1041513A; PL270816A1; DE3688911D1; CS270445B2; HU206957B; MY102191A; CN86108573A; CN1026585C; EP0294375A1; CN1021821C; KR920002076B1; BR8607229A; PL151567B1; CN1038570A

Abstract

Herbicidal compounds of formula (I) in which, for example, X is Br, Cl or F; Y is Cl or Br, R2 is CHF2, R3 is CH3, R is lower alkyl and R1 is H, Na, lower alkyl or -SO2R.

Description

HERBICIDAL ARYL TRIAZOLINONES

The invention described in this application pertains to weed control in agriculture, horticulture, and other fields where there is a desire to control unwanted plant growth. More specifically, the present application describes certain herbicidal aryl triazolinones, compositions of them, methods of preparing them, and methods for preventing or destroying undesired plant growth by preemergence or postemergence application of the herbicidal compositions to the locus where control is desired. The present compounds may be used to effectively control a variety of both grassy and broadleaf plant species. The present invention is particularly useful in agriculture; a number of the compounds described herein show a selectivity favorable to certain crops (e.g. soybeans on preemergence treatment) at application levels which inhibit the growth of or destroy a variety of weeds.

One aspect of this invention relates to herbicidal compounds of the general formula

wherein

X is bromine, chlorine, or fluorine or alkyl (e.g. CH₃) or haloalkyl (e.g. CF₃);

Y is bromine, chlorine, fluorine, methyl, haloalkyl (e.g. FCH₂ or CF₃), nitro, a radical of the formula R⁸OCH₂-, R⁸SCH₂-, R⁸SOCH₂- or R⁸SO₂CH₂- where R⁸ is C₁-C₃alkyl, C₂-C₅alkenyl, or C₃-C₅ alkynyl (e.g., CH₃OCH₂-, CH₃SCH₂-, CH₂=CHCH₂OCH₂-

CH₂=CHCH₂SCH₂-, CH≡CCH₂OCH₂-, or CH≡C-CH₂SCH₂); R⁸ may also be phenyl (or phenyl substituted with e.g., halogen, alkyl, haloalkyl), R³ may be halogen (e.g. chlorine), alkyl (e.g. of 1 to 5 carbon atoms), haloalkyl (e.g. of 1 to 5 carbon atoms such as difluoromethyl), alkoxyalkyl

(e.g. of 2 to 6 carbon atoms such as methoxymethyl), cyanoalkyl (e.g. of 2 to 6 carbon atoms such as cyanomethyl), arylalkyl such as benzyl, alkylthio (e.g. of 1 to 3 carbon atoms such as methylthio) or the corresponding alkylsulfinyl or alkylsulfonyl, or alkylthioalkyl (e.g., of 1 to 3 carbon atoms independently with respect to each alkyl, such as methylthiomethyl) or the corresponding alkylsulfinylalkyl or alkylsulfonylalkyl; R² may be alkyl (e.g. of 1 to 5 carbon atoms), lower alkoxy (e.g. methoxy), haloalkyl (e.g. of 1 to 5 carbon atoms, such as CHF₂ or CH₂CH₂CH₂F), alkenyl of 2 to 5 carbon atoms (e.g. allyl), alkynyl of 3 to 5 carbon atoms (e.g. propargyl), cyanoalkyl

(e.g. CH₂CN or CH₂CH₂CN), thiocyanoalkyl (e.g.

CH₂SCN) or a group of the formula -alkylene-Y¹-R⁵ in which said alkylene group (e.g. -CH₂-) has 1 to 5 carbon atoms, Y ¹ being oxygen or S(O)_r in which r is 0 to 2, and R⁵ being alkyl (e.g. of 1 to 5 carbon atoms such as methyl), alkenyl of 2 to 5 carbon atoms

(e.g. allyl) or alkynyl of 3 to 5 carbon atoms (such as propargyl); R may be alkyl (such as straight chain or branched chain lower alkyl, e.g. methyl, ethyl, propyl), haloalkyl (such as CF₃ or CHF₂), dialkylamino, carboxymethyl, hydroxy or aryl (such as phenyl, optionally substituted with one or more of: halogen such as Cl, Br or F; alkyl such as lower alkyl, e.g. methyl; alkoxy such as lower alkoxy, e.g. methoxy; cyano; cyanomethyl; nitro; amino; arylamino such as phenylamino; mono- and dialkylamino such as methylamino or dimethylamino; carboxyl; alkoxycarbonyl such as -COOC₂H₅; alkoxyalkyl such as alkoxymethyl of 2 to 4 carbon atoms; alkoxycarbonylalkyl such as -CH₂COOC₂H₅; benzyl; or hydroxy).

R¹ may be hydrogen, alkyl (e.g. straight or branched chain lower alkyl such as methyl, ethyl, propyl, isopropyl or butyl), benzyl, haloalkyl (e.g. CHF₂ or CH₂CH₂CH₂F), alkoxy (e.g. methoxy),

SO₂R, alkynyl (such as propargyl), alkenyl (such as allyl), a group of the formula -alkylene-SO₂R (in which, for example, said alkylene group (e.g. -CH₂-) has 1 to 4 carbon atoms, alkoxymethyl (such as methoxymethyl, cyanomethyl, carboxymethyl (including salts thereof) or alkoxycarbonylmethyl.

R and R¹ together may be a divalent radical such as alkylene (e.g. of 1 to 10 carbon atoms such as methylene or 1,3-propylene). R¹ may also be a salt-forming group such as a metal (e.g. Na, K or Ca) or ammonium (e.g. NH₄ or lower alkyl-substituted ammonium) or sulfonium or sulfoxonium (such as salts of bases of the formula R"₃ S(O)_n where R" is, for instance, lower alkyl (e.g. C₁-C₃ alkyl) and n is zero or one, e.g. the trimethylsulfoxonium salt.

In each aspect of the invention, it is often preferable that any alkyl, alkenyl, alkynyl or alkylene radical have less than 6 carbon atoms. Representative compounds according to the invention are shown in Table 1 below.

The compounds of this invention are preferably those whose Methoxy Analog or Propargyloxy Analog is a herbicide. The term "Methoxy Analog" is used here to designate a compound which is otherwise identical except that it has a methoxy group instead of the

-N-SO₂R group of said compound. The term "Propargyl- R ¹ oxy Analog" is similarly used here for a compound which is otherwise identical except that it has a propargyloxy group instead of the group of

said compound.

The compounds of this invention preferably have Methoxy Analogs and Propargyloxy Analogs of marked herbicidal properties. For instance said Analogs of the preferred compounds show at least 50% kill of at least one of the following species of plants when applied under at least one of the following modes at the rate of 0.5 kg/ha, and more preferably show such kill of at least 50% when applied at the rate of 0.1 kg/ha: Species: velvetleaf (Abutilon theophrasti), green foxtail (Setaria viridis); Modes: pre-emergent, post-emergent. Testing for such herbicidal activity may be carried out in the manner described below (under the heading "Herbicidal Activity").

The compounds of this invention may be prepared by the use of steps generally described in the literature or by methods analogous or similar thereto and within the skill of the art. In the Examples below an arylamine is treated to form the corresponding aryl hydrazine whose hydrazine portion is then modified to form a triazolinone ring. Thereafter the benzene ring of the intermediate is nitrated, the nitro group is reduced to form an amino group, which is then treated with RSO₂Cl or (RSO₂)₂O to convert it to an -N(R¹)SO₂R group (e.g. by using a weak base such as pyridine, as in Example 6A below, or NaHCO₃) or to an --N(SO₂R)₂ group (as in Examples 2, 5, 9, 12, 14 or 17). The compound having the -N(SO₂R)₂ group may then be treated (as with a base such as

NaOH) to form the corresponding -NR¹SO₂R group, where R ¹ is a salt-forming group (e.g. Na); this may then be treated with an acid to form the corresponding (acidic) -NHSO₂R group. Subsequent alkylation (as by treatment with the appropriate alkyl halide as in

Example 7) forms the corresponding group;

R¹ substituents other than alkyl may be introduced similarly. When the reaction sequence involves

RSO₂Cl treatment of an intermediate having hydrogen on the 4-nitrogen of the triazolinone ring, that hydrogen may also be replaced, during such treatment, by RSO₂- to form an intermediate (such as compound 36 in table 1 below, which has 3 RSO₂- groups) from which the RSO₂- group on said 4-nitrogen may be removed readily by the treatment with the base, after which the appropriate R² group may be substituted on said 4-nitrogen.

In the Examples the modification of the hydrazine group to form a triazolinone ring is effected by reaction with pyruvic acid (forming the hydrazone) and then with a phosphoryl azide. Other techniques for this include treating the substituted phenylhydrazine with any of the following four types of reagents:

(a) an inner salt of a 3-(1-iminoalkylmercapto)-1-propanesulfonic acid (which may be prepared according to Reid and Schmidt, Ann. Chem. 676, 114 (1964) from 1,3-propanesultone and a thioamide), to form an amidrazone followed by reaction with a source of phosgene, as by the following reaction sequence (which is also illustrated in Example 15 below),

in which "Ar" is aromatic as described below.

(b) An imidate ester of the formula

to form the corresponding amidrazone (as described, for instance, in the article by Neilson et al "The Chemistry of Amidrazones": Chem. Rev. 70 , 151(1970) at page 156), followed by reaction with a source of phosgene, as in (a) above, R^c and R^d being alkyl or other suitable radical.

(c) A compound of the formula

(where R^a and R^b are lower alkyl) in the presence of a base according to the following sequence:

in which R¹ is defined above, e.g. methyl; (d) A haloalkylnitrile (e.g. a fluoroalkyl, fluorochloroalkyl or fluorobromoalkyl nitrile such as ClCF₂CN, followed by reaction with a source of phosgene, so that the reaction may proceed along the following lines, for instance to form the aryl 3-haloalkyl triazoline, thus:

In Examples 1, 8 and 13 below two halogen substituents are present on the "Ar" portion of the molecule before the triazoline ring is formed; that is, the Ar portion of the aryl hydrazine has halo substituents at its 2 and 4 positions. Instead, in each of the processes illustrated above (and in the process of those Examples 1, 8 and 13) one or both of the halogens may be placed on Ar after the triazoline ring is formed. Thus the Ar group of the arylamine (and of the corresponding hydrazine formed therefrom) may be phenyl or monohalophenyl (e.g. 2-fluorophenyl) or nitrophenyl (e.g. 3-nitrophenyl) or monohalonitrophenyl (e.g.

2-fluoro-5-nitrophenyl) and the aryl triazoline formed therefrom may then be treated to (a) alkylate the nitrogen at the 4-position of the triazoline ring (in known manner, e.g. with an alkyl or fluoroalkyl halide, such as with CICHF₂, at a temperature of, say, 50 to 150ºC) to add the preferred - CHF₂ substituent) and (b) to introduce additional substituents onto the aromatic ring, as by halogenation with chlorine or bromine (e.g. by reacting with Cl₂, Br₂ or SO₂Cl₂ at a temperature of, say,

20 to 150°C). For instance the alkylation of the nitrogen at the 4-position may be effected first, after which the nitro group (if present) may be reduced to an amino group in conventional manner, the amino group may be converted to the organic sulfonylamino group (e.g. in the manner shown in the Examples using, for instance, a temperature below 60ºC such as -10 to 50ºC in the presence of a suitable base and inert solvent), after which the compound may be halogenated as indicated above to place the halogen substitutent or substituents on its benzene ring. For instance, for making one preferred class of compounds of the invention in which the benzene ring has a 2-fluoro substituent, the starting material may be 2-fluoro-5-nitrophenylhydrazine, which may be treated as described above to produce successively a series of intermediates such as:

1-(2-fluoro-5-nitrophenyl)-4,5-dihydro-3-methyl-1,2,4-triazol-5(1H)-one, then

1-(2-fluoro-5-nitrophenyl)-4,5-dihydro-4-difluoromethyl-3-methyl-1,2,4-triazol-5(1H)-one, then

1-(2-fluoro-5-aminophenyl)-4,5-dihydro-4-difluoromethyl-3-methyl-1,2,4-triazol-5(1H)-one, then the corresponding compound having an

group at the 5-position of the benezene ring such as

1-[2-fluoro-5-(N-ethylsulfonyl)aminophenyl]-4,5-dihydro-4-difluoromethyl-3-methyl-1,2,4-triazol-5(1H)-one, followed by halogenation to place, for instance, a chloro or bromo substituent at the 4-position of the benzene ring.

Instead of alkylating at the 4-position of the ring triazoline at an early stage, e.g. prior to altering the nitro group, this alkylation step may be delayed until after the above-described halogenation of the benzene ring. Another series of intermediates comprises: 1-(5-nitrophenyl)-4,5-dihydro-3-methyl-1,2,4-triazol-5(1H)-one, then

1-(5-nitrophenyl)-4,5-dihydro-4-difluoromethyl-3-methyl-1,2,4-triazol-5(1H)-one, then

1-(5-aminophenyl)-4,5-dihydro-4-difluoromethyl-3-methyl-1,2,4-triazol-5(1H)-one, then the corresponding compound having an

group at a meta-position on the benzene ring such as 1-[5-(N-ethylsulfonyl)aminophenyl]-4,5-dihydro-4-difluoromethyl-3-methyl-1,2,4-triazol-5(1H)-one, followed by halogenation to place, for instance, two chloro (or bromo) substituents at the 2- and 4-positions of the benzene ring.

Variations in the sequence in which the reactions are carried out will produce other intermediates such as :

1-(2-chloro-5-nitrophenyl)-4,5-dihydro-4-difluoromethyl-3-methyl-1,2,4-triazol-5(1H)-one, which may be converted to the corresponding 2-fluoro-5-nitrophenyl compound by appropriate treatment with KF to replace the 2-chloro substituent by a 2-fluoro substituent; also, 1-(2-fluorophenyl)-4,5-dihydro-3-methyl-1,2,4-triazol-5(1H)-one, which may be converted to

1-(2-fluorophenyl)-4,5-dihydro-4-difluoromethyl-3-methyl-1,2,4-triazol-5(1H)-one which may then be chlorinated, as by appropriate treatment with SO₂Cl₂, to the corresponding 2-fluoro-4-chlorophenyl compound. Another sequence involves formation of: 2-fluoro-4-nitrophenylhydrazine, then 1-(2-fluoro-4-nitrophenyl)-4,5-dihydro-3-methyl-1,2,4-triazol-5(1H)-one, then

1-(2-fluoro-4-nitrophenyl)-4,5-dihydro-4-difluoromethyl-3-methyl-1,2,4-triazol-5(1H)-one, then 1-(2-fluoro-4-aminophenyl)-4,5-dihydro-4-difluoromethyl-3-methyl-1,2,4-triazol-5(lH)-one, followed by treatment to replace the amino group by a chlorine (as by treatment with NaNO₂/HCl and then CuCl). Similarly, when the reagent (s) used to react with the aryl hydrazine are such as to produce a triazolinone having a haloalkyl (e.g. CHF₂) group instead of an alkyl group on the carbon at the 3-position of the heterocyclic ring, the series of intermediates may include, successively (from 2-fluoro-5-nitrophenylamine, and then its hydrazine) such compounds as :

1-(2-fluoro-5-nitrophenyl)-4,5-dihydro-3-difluoromethyl-1,2,4-triazol-5(1H)-one, then 1-(2-fluoro-5-nitrophenyl)-4,5-dihydro-4-methyl (or difluoromethyl)-3-difluoromethyl-1,2,4-triazol-5(1H)-one, then

1-(2-fluoro-5-aminophenyl)-4,5-dihydro-4-methyl (or difluoromethyl)-3-difluoromethyl-1,2,4-triazol-5(1H)-one, then the corresponding compound having an

group at the 5-ρosition of the benzene ring such as

1-[2-fluoro-5-(N-ethylsulfonyl)aminophenyl]-4,5-dihydro-4-methyl (or difluoromethyl)-3-difluoromethyl- 1,2,4-triazol-5(1H)-one, followed by halogenation to place, for instance, a chloro or bromo substituent at the 4-position of the benzene ring. Another series of intermediates, from 5-nitrophenylamine includes:

1-(5-nitrophenyl)-4,5-dihydro-3-difluoromethyl- 1,2,4-triazol-5(1H)-one, then 1-(5-nitrophenyl)- 4,5-dihydro-4-methyl (or difluoromethyl)-3-difluoromethyl-1,2,4-triazol-5(1H)-one, then 1-(5-aminophenyl)-4,5-dihydro-4-methyl (or difluoromethyl)-3-difluoromethyl-1,2,4-triazol-5(1H)-one, then the corresponding compound having an

group at a meta-position on the benzene ring such as 1-[5-(N-ethylsulfonyl)aminophenyl]-4,5-dihydro-4-methyl or difluoromethyl)-3-difluoromethyl-1,2,4-triazol-5(1H)-one, followed by halogenation to place, for instance, two chloro (or bromo) substituents at the 2- and 4-positions of the benzene ring.

Variations in the sequence in which the reactions are carried out will produce other intermediates such as:

1-(2-chloro-5-nitrophenyl)-4,5-dihydro-4-(methyl or difluoromethyl)-3-difluoromethyl-1,2,4-triazol-5(1H)-one, which may be converted to the corresponding 2-fluoro-5-nitrophenyl compound by appropriate treatment with KF to replace the 2-chloro substituent by a 2-fluoro substituent; also, 1-(2-fluorophenyl)-4,5-dihydro-3-difluoromethyl-1,2,4-triazol-5(1H)-one, which may be converted to 1-(2-fluorophenyl)-4,5-dihydro-4-methyl(or difluoromethyl)-3-methyl-1,2,4-triazol-5(1H)-one which may then be chlorinated, as by appropriate treatment with SO₂Cl₂ to the corresponding 2-fluoro-4-chlorophenyl compound. Another sequence involves formation of: 2-fluoro-4-nitrophenylhydrazine, then 1-(2-fluoro-4-nitrophenyl)-4,5-dihydro-3-difluoromethyl-1,2,4-triazol-5(1H)-one, then

1-(2-fluoro-4-nitrophenyl)-4,5-dihydro-4-methyl (or difluoromethyl)-3-difluoromethyl-1,2,4-triazol- 5 (1H) -one, then

1-(2-fluoro-4-aminophenyl)-4,5-dihydro-4-methyl (or difluoromethyl)-3-difluoromethyl-1,2,4-triazol-5(1H)-one, followed by treatment to replace the amino group by a chlorine (as by treatment with NaNO₂/HCl and then CuCl).

The following Examples illustrate the preparation of the compounds of this invention. In those Examples the hetercyclic ring is described as: Δ²-1,2,4-triazolin-5-one; that is a synonym for: dihydro-1,2,4-triazol-5 (1H)-one.

EXAMPLE 1

SYNTHESIS OF 1-(5-AMINO-4-CHLORO-2-FLUOROPHENYL)-3-METHYL-4-DIFLUOROMETHYL-Δ²-1,2,4- TRIAZOLIN-5-ONE AS AN INTERMEDIATE

Step A Synthesis of 2-Fluoroacetanilide as an Intermediate

To a stirred solution of 100 g (0.9 mole) of 2-fluoroaniline in 200 ml of water was added 105 ml (1.1 moles) of acetic anhydride. Upon completion of addition the reaction mixture was filtered to collect a solid. The solid was dried to yield 105 g of 2-fluoroacetanilide; m.p. 74-76ºC. The reaction was repeated several times.

Step B Synthesis of 4-Chloro-2-fluoroacetanilide as an Intermediate

To a stirred solution of 180.0 g (1.17 moles) of 2-fluoroacetanilide in 210 ml of p-dioxane was slowly added dropwise 173.4 g (9.29 moles) of sulfuryl chloride. Upon completion of addition the reaction mixture stirred at ambient temperature for 16 hours. A solid was collected by filtration, washed with water, and dried to yield 155 g of 4-chloro-2-fluoroacetanilide; m.p. 147-148°C.

Step C Synthesis of 4-Chloro-2-fluoroaniline as an Intermediate

To a stirred solution of 155 g (0.83 mole) of 4-chloro-2-fluoroacetanilide in 400 ml of ethanol was added dropwise a solution of 72.0 g (1.8 moles) of sodium hydroxide in 100 ml of water. Upon completion of addition the reaction mixture was heated under reflux for three hours. The reaction mixture was cooled to ambient temperature and extracted with diethyl ether. The combined extracts were concentrated, under reduced pressure to a residual oil. The oil was distilled under reduced pressure to yield 81.0 g of 4-chloro-2-fluoroaniline; b.p. 83-85/12 mm. The reaction was repeated several times.

Step D Synthesis of Pyruvic Acid, 4-chloro-2- fluorophenylhydrazone as an Intermediate

Under a nitrogen atmosphere, a stirred solution of 20.0 g (0.137 mole) of 4-chloro-2-fluoroaniline in 162 ml of concentrated hydrochloric acid was cooled to -9°C and a solution of 9.5 g (0.137 mole) of sodium nitrite in 50 ml of water was added dropwise at a rate to maintain the reaction mixture temperature at -9°C. The complete addition required 30 minutes. The reaction mixture was stirred for an additional one hour at -9°C to 0°C, then a solution of 68.1 g (0.30 mole) of stannous chloride in 68 ml of concentrated hydrochloric acid was added dropwise at a rate to maintain the reaction mixture temperature at -9°C to 0ºC. The complete addition required 40 minutes. The reaction mixture stirred at -9°C to 0°C for an additional 30 minutes, then was allowed to warm to ambient temperature where it stirred for two hours. Water, 110 ml, was added to the reaction mixture, and then a solution of 12.2 g (0.137 mole) of pyruvic acid in 125 ml of water was added dropwise during a five minute period. Upon completion of addition the reaction mixture stirred an additional 30 minutes then was filtered to collect a solid. The solid was washed with water and dried to give 27.7 g of pyruvic acid, 4-chloro-2-fluorophenylhydrazone; m.p. 162-163°C. The reaction was repeated several times.

Step E Synthesis of 1-(4-chloro-2-fluorophenyl)- 3-methyl-Δ²-1,2,4-triazolin-5-one as an Intermediate

To a stirred suspension of 25.4 g (0.110 mole) of pyruvic acid, 4-chloro-2-fluorophenylhydrazone in 200 ml of toluene was added 11.1 g (0.11 mole) of triethylamine. The reaction mixture became homogeneous and 30.3 g (0.11 mole) of diphenylphosphoryl azide was added. Upon completion of addition the reaction mixture was heated to reflux where it stirred for two hours. The reaction mixture was cooled to ambient temperature and extracted with 300 ml of aqueous IN sodium hydroxide. The extract was neutralized with concentrated hydrochloric acid and a solid precipitate collected by filtration. The solid was washed with water and dried to yield 21.1 g of 1-(4-chloro-2-fluorophenyl)-3-methyl-Δ²-1,2,4-triazolin-5-one; m.p. 189-191ºC. The reaction was repeated several times. Step F Synthesis of 1-(4-chloro-2-fluorophenyl)- 3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one as an Intermediate

A stirred solution of 27.4 g (0.12 mole) of 1-(4-chloro-2-fluorophenyl)-3-methyl-Δ²-1,2,4-triazolin-5-one, 13.5 g (0.24 mole) of powdered potassium hydroxide, and 3.9 g (0.012 mole) of tetrabutylammonium bromide in 500 ml of tetrahydrofuran was cooled in an ice bath and chlorodifluoromethane was bubbled into the reaction mixture. The ice bath was removed and chlorodifluoromethane continued to bubble into the reaction mixture until condensation of it was observed on a dry ice condenser attached to the reaction vessel. Upon completion of addition the reaction mixture stirred at ambient temperature for 16 hours. An additional 6.7 g (0.12 mole) of powdered potassium hydroxide was added to the reaction mixture and it was again saturated with chlorodifluoromethane. The reaction mixture was stirred for two hours then diluted with water. The mixture was extracted with diethyl ether and the combined extracts washed with water. The organic layer was dried with sodium sulfate and filtered. The filtrate was concentrated under reduced pressure to a residue. The residue was dissolved in methylene chloride and passed through a pad of silica gel. The eluate was concentrated under reduced pressure to a residual solid. The solid was recrystallized from methylene chloride-heptane to yield 9.5 g of 1-(4-chloro-2-fluorophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4-tetrazolin-5-one as a solid. The reaction was repeated several times. Step G Synthesis of 1-(4-chloro-2-fluoro-5-nitrophenyl)-3-methyl-4-difluoromethyl-Δ²- 1,2,4-triazolin-5-one as an Intermediate

To a stirred solution of 6.1 g (0.022 mole) of

1-(4-chloro-2-fluorophenyl)-3-methyl-4-difluoromethyl- Δ²-1,2,4-triazolin-5-one in 9 ml of concentrated sulfuric acid was slowly added 1.96 ml of 70% nitric acid, while maintaining the reaction mixture temperature at 25°C. Upon completion of addition the reaction mixture was stirred at 25°C for 30 minutes, then poured into ice water. The resultant solid was collected by filtration. The solid was dissolved in methylene chloride and passed through a pad of silica gel. The eluate was subjected to column chromatography on silica gel. Elution was completed using 1:1-petroleum ether:methylene chloride. The appropriate fractions were combined and concentrated under reduced pressure to yield 3.0 g of 1-(4-chloro-2-fluoro-5-nitrophenyl)-3-methyl-4-difluoromethyl-Δ²- 1,2,4-triazolin-5-one; m.p. 102-104°C. The reaction was repeated several times.

Step H Synthesis of 1-(4-amino-4-chloro-2-fluorophenyl)-3-methyl-4-difluoromethyl-Δ²- 1,2,4-triazolin-5-one as an Intermediate

To a stirred solution of 4.0 g (0.012 mole) of 1-(4-chloro-2-fluoro-5-nitrophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one in 50 ml of acetic acid and 20 ml of water was added portionwise 4.0 g. (0.072 mole) of powdered iron at a rate to maintain the reaction mixture temperature below 35 °C. Upon completion of addition the reaction mixture stirred at 25-30°C for two hours. The reaction mixture was diluted with diethyl ether with stirring, then was filtered through diatomaceous earth. The stirred filtrate was made basic with aqueous 10% sodium bicarbonate solution and solid potassium carbonate. The organic layer was separated, washed with three portions of water, then dried with sodium sulfate. The mixture was filtered and the filtrate concentrated under reduced pressure to a residue. The residue was purified by column chromatography on silica gel using methylene chloride:acetone as an eluent. The appropriate fractions were combined and concentrated under reduced pressure to yield 3.1 g of

1-(5-amino-4-chloro-2-fluorophenyl)-3-methyl-4-difluoromethyl-Δ²- 1,2,4-triazolin-5-one; m.p. 128-129ºC. The nmr and the ir spectra were consistent with the proposed structure. The reaction was repeated several times.

EXAMPLE 2 SYNTHESIS OF 1-[4-CHLORO-2-FLUORO-5-[BIS(N- METHYLSULFONYL)AMINO3PHENYL3-3-METHYL-4- DIFLUOROMETHYL-Δ²-1,2,4-TRIAZOLIN-5-ONE

(COMPOUND 24)

A stirred solution of 1.0 g (0.003 mole) of 1-(5-amino-4-chloro-2-fluorophenyl)-3-methyl-4-difluoromethyl-Δ ²-1,2,4-triazolin-5-one (prepared as in Example 1) and 0.76 g (0.008 mole) of triethylamine in 20 ml of methylene chloride was cooled in an ice/ acetone bath and 0.83 g (0.007 mole) of methanesulfonyl chloride was added dropwise at a rate to maintain the reaction mixture temperature below 0°C. The complete addition required five minutes. Upon completion of addition the reaction mixture was allowed to warm to ambient temperature where it stirred for 16 hours. After this time the reaction mixture was con centrated under reduced pressure to. a residue. The residue was purified by column chromatography on silica gel using 50:1-methylene chloride:acetone as an eluent. The appropriate fractions were combined and concentrated under reduced pressure to a solid. The solid was recrystallized from acetone/heptane to yield

1.4 g of 1-[4-chloro-2-fluoro-5-[bis(N-methylsulfonyl)amino]phenyl]-3-methyl-4-difluoromethyl-Δ²- 1,2,4-triazolin-5-one; m.p. 180-195°C. The nmr and the ir spectra were consistent with the proposed structure.

Analysis calc'd for

C₁₂H₁₂ClF₃N₄O₅S₂: C 32.11; H 2.69 ; N 12.48

Found: C 31.98; H 2.32; N 12.15.

EXAMPLE 3

SYNTHESIS OF 1-[4-CHLORO-2-FLUORO-5-(N-METHYL¬

SULFONYLAMINO) PHENYL3-3-METHYL-4-DIFLUOROMETHYL- Δ²-1,2,4-TRIAZOLIN-5-ONE (COMPOUND 3) To a stirred solution of 1.0 g (0.002 mole) of

1-[4-chloro-2-fluoro-5-[bis(N-methylsulfonyl)amino]-phenyl]-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one (prepared as in Example 2) in 25 ml of methanol was added a solution of 0.17 g (0.004 mole) of sodium hydroxide in 3 ml of water. Upon completion of addition the reaction mixture was stirred for 15 minutes then poured into 100 ml of water. The mixture was neutralized with concentrated hydrochloric acid and the solid precipitate collected by filtration. The solid was dried to yield 0.65 g of 1-[4-chloro-2-fluoro-5-(N-methylsulfonylamino)phenyl]-3-methy1-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one; m.p. 156- 159°C.

The nmr spectrum was consistent with the proposed structure. Analysis calc'd for

C₁₁H₁₀ClF₃N₄O₃S: C 34.79; H 2.65; N 14.75; Found: C 35.47; H 2.53; N 14.94.

EXAMPLE 4

SYNTHESIS OF 1-[4-CHLORO-2-FLUORO-5-[(N-ETHYL¬

SULFONYL-N-METHYLSULFONYL)AMINO]PHENYL]-3- METHYL-4-DIFLU0R0METHYL-Δ²-1,2,4-TRIAZOLIN-5-ONE

(COMPOUND 28) This compound was prepared in a manner analogous to that of Example 2, using 0.31 g (0.0009 mole) of

1-[4-chloro-2-fluoro-5-(N-methylsulfonylamino)phenyl]-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one,

0.14 g (0.0011 mole) of ethanesulfonyl chloride, and 0.12 g of triethylamine in 5 ml of methylene chloride. The yield of 1-[4-chloro-2-fluoro-5-(N-ethylsulfonyl-N-methylsulfonyl)amino]phenyl]-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one was 0.33 g; m.p. 128-131.5ºC. The nmr spectrum was consistent with the proposed structure. Analysis calc'd for

C₁₃H₁₄CIF₃N₄O₅S₂: C 33.73; H 3.05; N 12.11;

Found: C 33.57; H 3.17; N 12.12.

EXAMPLE 5

SYNTHESIS OF 1-[4-CHLORO-2-FLUORO-5-[BIS(N- ETHYLSULFONYL)AMINO3PHENYL]-3-METHYL-4-DI¬

FLUOROMETHYL-Δ²-1,2,4-TRIAZOLIN-5-ONE (COMPOUND 38)

This compound was prepared in a manner analogous to that of Example 2 using 1.0 g (0.003 mole) of

1-(5-amino-4-chloro-2-fluorophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one (prepared as in Example 1) 0.9 g (0.007 mole) of ethanesulfonyl chloride and 0.7 g (0.007 mole) of triethylamine in methylene chloride. The yield of 1-[4-chloro-2-fluoro-5-[bis(N-ethylsulfonyl)amino]phenyl]-3-methyl- 4-difluoromethyl-Δ ²-1,2,4-triazolin-5-one was 0.6 g; m.p. 143-144°C.

The nmr spectrum was consistent with the proposed structure.

The reaction was repeated several times.

EXAMPLE 6

SYNTHESIS OF 1-[4-CHLORO-2-FLUORO-5-(N-ETHYL¬

SULFONYLAMINO) PHENYL]-3-METHYL-4-DIFLUORO¬

METHYL-Δ²-1,2,4-TRIAZOLIN-5-ONE

(COMPOUND 11) This compound was prepared in a manner analogous to that of Example 3, using 1.1 g (0.0022 mole) of

1-[4-chloror-2-fluoro-5-[bis(N-ethylsulfonyl)amino]- phenyl]-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one (prepared as in Example 5) and 0.17 g (0.0044 mole) of sodium hydroxide in 25 ml of methanol. The yield of 1-[4-chloro-2-fluoro-5-(N-ethylsulfonylamino)phenyl]-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one was 0.8 g; m.p. 162-163ºC.

The nmr spectrum was consistent with the proposed structure.

Analysis calc'd for

C₁₂H₁₂ClF₃N₄O₃S: C 37.46; H 3.14; N 14.56; Found: C 37.65; H 3.12; N 14.44.

EXAMPLE 6A

SYNTHESIS OF 1-[4-CHLORO-2-FLUORO-5-(N- ETHYLSULFONYLAMINO) PHENYL]-3-METHYL-4- DIFLUOROMETHYL-Δ²-1,2,4-TRIAZOLIN-5-ONE

(COMPOUND 11)

A stirred suspension of 1.0 g (0.0034 mole) of 1-(4-amino-4-chloro-2-fluorophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one in 5 ml of methylene chloride was cooled in an ice water bath and 0.3 ml (0.0037 mole) of pyridine was added. Upon completion of addition 0.33 ml (0.0035 mole) of ethanesulfonyl chloride was added and the reaction mixture was stirred at 0ºC for one hour. After this time the reaction mixture was allowed to warm to ambient temperature where it stirred for 16 hours. Analysis of the reaction mixture by thin layer chromatography (TLC) indicated the presence of a small amount of starting material. An additional 0.05 ml of pyridine and 0.05 ml of ethanesulfonyl chloride were added and the reaction mixture was stirred at ambient temperature for one hour. Analysis of the reaction mixture by TLC indicated that the reaction had gone to completion. The reaction mixture was poured into water. The organic layer was separated and the, water layer extracted with methylene chloride. The extracts and the organic layer were combined and washed in succession with aqueous IN hydrochloric acid, aqueous saturated sodium bicarbonate solution, water, and aqueous saturated sodium chloride solution. The organic layer was dried with magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure to a residue. The residue was dried under high vacuum to yield 1.45 g of 1-[4-chloro-2-fluoro- 5-(N-ethylsulfonylamino)phenyl]-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one as an oily foam. The nmr spectrum was consistent with the proposed structure.

EXAMPLE 7

SYNTHESIS OF 1-[4-CHLORO-2-FLUORO-5-[(N- ETHYLSULFONYL-N-METHYL) AMINO3PHENYL3-3-METHYL- 4-DIFLUOROMETHYL-Δ²-1,2,4-TRIAZOLIN-5-ONE

(COMPOUND 29) To a stirred suspension of 0.095 g (0.0019 mole) of sodium hydride (50% in mineral oil) in dimethylformamide was added.0.7 g (0.0019 mole) of 1-[4-chloro-2-fluoro-5-(N-ethylsulfonylamino)phenyl]-3-methy1-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one

(prepared as in Examine 6). The reaction mixture was stirred until homogeneous, approximately 15 minutes. After this time 0.28 g (0.002 mole) of methyl iodide was added to the reaction mixture, which was then stirred for 16 hours. The reaction mixture was diluted with diethyl ether and washed with water. The organic layer was dried with sodium sulfate, filtered, and concentrated under reduced pressure to a residue. The residue. was purified by column chromatography on silica gel using 50:1-methylene chloride:acetone as an eluent. The appropriate fractions were combined and concentrated under reduced pressure to yield 0.7 g of

1-[4-chloro-2-fluoro-5-[(N-ethylsulfonyl-N-methyl)-amino]phenyl]-3-methyl-4-difluoromethyl-Δ ²-1,2,4-triazolin-5-one; m.p. 101-103.5°C.

The nmr spectrum was consistent with the proposed structure.

Analysis calc'd for

C₁₃H₁₄ClF₃N₄SO₅: C 39.15; H 3.54; N 14.05; Found: C 39.46; H 3.57; N 13.91.

EXAMPLE 8

SYNTHESIS OF 1-(5-AMINO-4-BROMO-2-FLUOROPHENYL) -3-METHYL-4-DIFLUOROMETHYL-Δ²-1,2,4- TRIAZOLIN-5-ONE AS AN INTERMEDIATE

Step A Synthesis of Pyruvic Acid, 4-Bromo-2-fluorophenylhydrazone as an Intermediate

This compound was prepared in a manner analogous to that of Example 1, Step D, using 24.3 g (0.128 mole) of commercially available 4-bromo-2-fluoroaniline, 11.3 g (0.128 mole) of pyruvic acid, 8.8 g (0.128 mole) of sodium nitrite and 63.2 g (0.28 mole) of stannous chloride in 48 ml of water and 214 ml of concentrated hydrochloric acid. The yield of pyruvic acid, 4-bromo-2-fluorophenylhydrazone was 27.2 g; m.p. 172-173°C. The reaction was repeated several times.

Step B Synthesis of 1-(4-Bromo-2-fluorophenyl)-3- methyl-Δ²-1,2,4-triazolin-5-one as an Intermediate

This compound was prepared in a manner analogous to that of Example 1, Step E. The reaction was run in three batches using a total of 34.3 g (0.125 mole) of pyruvic acid, 4-bromo-2-fluorophenylhydrazone, 35.0

(0.127 mole) of diphenylphosphoryl azide, and 12.6 g

(0.125 mole) of triethylamine in 300 ml of toluene. The reaction mixtures were combined for isolation of product. The yield of 1-(4-bromo-2-fluorophenyl)-3-methyl-Δ²1,2,4-triazolin-5-one was 271.0 g, m.p.

201-203°C.

The nmr spectrum was consistent with the proposed structure. The reaction was repeated several times.

Step C Synthesis of 1-(4-bromo-2-fluorophenyl)-3- methyl-4-difluoromethyl-Δ²-1,2,4-triazolin- 5-one as an Intermediate

This compound was prepared in a manner analogous to that of Example 1, Step F using 13.0 g (0.048 mole) of 1-(4-bromo-2-fluorophenyl)-3-methyl-Δ²-1,2,4-triazolin-5-one, 8.0 g (0.143 mole) of powdered potassium hydroxide, 1.6 g (0.005 mole) of tetrabutylammo nium bromide, and chlorodifluoromethane in 200 ml of tetrahydrofuran. The yield of 1-(4-bromo-2-fluorophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one was 6.5 g. The reaction was repeated several times.

Step D Synthesis of 1-(4-Bromo-2-fluoro-5-nitrophenyl)-3-methyl-4-difluoromethyl-Δ²- 1,2,4-triazolin-5-one as an Intermediate

This compound was prepared in a manner analogous to that of Example 1, Step G using 7.0 g (0.022 mole) of 1-(4-bromo-2-fluorophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one and 1.96 ml of 70% nitric acid in 9 ml of concentrated sulfuric acid.

The yield of 1-(4-bromo-2-fluoro-5-nitrophenyl)- 3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one was 2.9 g; m.p. 99-105°C. The reaction was repeated several times.

Step E Synthesis of l-(5-amino-4-bromo-2-fluorophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4- triazolin-5-one as an Intermediate

This compound was prepared in a manner analogous to that of Example 1, Step H using 2.5 g (0.007 mole) of 1-(4-bromo-2-fluoro-5-nitrophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one and 1.5 g

(0.027 mole) of powdered iron in 1 ml of water and 30 ml of acetic acid. The yield of 1-(5-amino-4-bromo-2-fluorophenyl)-3-methyl-4-difluoromethyl-Δ²- 1,2,4-triazolin-5-one was 1.7 g; m.p. 117-119°C.

The nmr spectrum was consistent with the proposed structure. The reaction was repeated several times. EXAMPLE 9

SYNTHESIS OF 1-[4-BROMO-2-FLUORO-5-[BIS(N- ETHYLSULFONYL)AMINO]PHENYL]-3-METHYL-4- DIFLUOROMETHYL-Δ²-1,2,4-TRIAZOLIN-5-ONE

(COMPOUND 40) This compound was prepared in a manner analogous to that of Example 2 using 1.6 g (0.0047 mole) of

1-(5-amino-4-bromo-2-fluorophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one (prepared as in

Example 8), 1.2 g (0.0095 mole) of ethanesulfonyl chloride, and 1.0 g (0.01 mole) of triethylamine in

24 ml of methylene chloride. The yield of 1-[4-bromo- 2-fluoro-5-[bis(N-ethylsulfonyl)amino3phenyl]-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one was 0.9 g; m.p. 145-146°C. The nmr spectrum was consistent with the proposed structure.

Analysis calc'd for

C₁₄H₁₆BrF₃N₄O₅S₂: C 32.25; H 3.09; N 10.75;

Found: C 31.94; H 3.10; N 10.78.

EXAMPLE 10 SYNTHESIS OF 1-[4-BROMO-2-FLUORO-5-(N- ETHYLSULFONYLAMINO) PHENYL3-3-METHYL-4- DIFLUOROMETHYL-Δ²-1,2,4-TRIAZOLIN-5-ONE (COMPOUND 13) This compound was prepared in a manner analogous to that of Example 2 using 0.52 g (0.001 mole) of

1-[4-bromo-2-fluoro-5-[bis(N-ethylsulfonyl)amino]-phenyl]-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one (prepared as in Example 9), and 0.1 g

(0.0025 mole) of sodium hydroxide in 3 ml of water and

40 ml of methanol. The yield of 1-[4-bromo-2-fluoro- 5-(N-ethylsulfonylamino)phenyl]-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one was 0.38 g; m.p.

140-141°C. 1 The nmr spectrum was consistent with the proposed structure.

EXAMPLE 11

SYSTHESIS OF 1-(5-AMINO-4-BROMO-2-FLUORO¬

PHENYL) -3,4-DIMETHYL-Δ²-1,2,4-TRIAZOLIN-5-ONE

AS AN INTERMEDIATE

Step A Synthesis of 1-(4-bromo-2-fluorophenyl)-3,4- dimethyl-Δ²-1,2,4-triazolin-5-one as an Intermediate

This compound was prepared in a manner analogous to that of Example 7, using 6.0 g (0.022 mole) of 1-(4-bromo-2-fluorophenyl)-3-methyl-Δ²-1,2,4-triazolin-5-one (prepared as in Example 8, Step B), 4.1 g

(0.029 mole) of methyl iodide, and 1.1 g (0.022 mole) of 50% sodium hydride in 50 ml of dimethylformamide.

The yield of 1-(4-bromo-2-fluorophenyl)-3,4-dimethyl-Δ²-1,2,4-triazolin-5-one was 3.9 g; m.p. 122-123.5°C.

The nmr spectrum was consistent with the proposed structure.

Step B Synthesis of 1-(4-Bromo-2-fluoro-5-nitro- phenyl)-3,4-dimethyl-Δ²-1,2,4-triazolin- 5-one as an Intermediate

This compound was prepared in a manner analogous to that of Example 1, Step G using 3.7 g (0.013 mole) of 1-(4-bromo-2-fluorophenyl)-3,4-dimethyl-Δ²-1,2,4-triazolin-5-one and 0.98 g (0.016 mole) of 70% nitric acid in 15 ml of concentrated sulfuric acid. The yield of 1-(4-bromo-2-fluoro-5-nitrophenyl)-3,4-dimethyl-Δ²-1,2,4-triazolin-5-one was 2.6 g; m.p. 151.5-154.5°C. The nmr spectrum was consistent with the proposed structure.

Step C Synthesis of 1-(5-amino-4-bromo-2-fluorophenyl)-3,4-dimethyl-Δ²-1,2,4-triazolin-5- one as an Intermediate

This compound was prepared in a manner analogous to that of Example 1, Step H using 2.3 g (0.007 mole) of 1-(4-bromo-2-fluoro-5-nitrophenyl)-3,4-dimethyl-Δ²-1,2,4-triazolin-5-one and 2.3 g of powdered iron in 18 ml of water and 35 ml of acetic acid. The yield of 1-(5-amino-4-bromo-2-fluorophenyl)-3 ,4-dimethyl-Δ²-1,2,4-triazolin-5-one was 1.2 g; m.p. 151-155°C. The nmr spectrum was consistent with the proposed structure.

EXAMPLE 12

SYNTHESIS OF 1-[4-BROMO-2-FLUORO-5-[BIS(N- ETHYLSULFONYL)AMINO]PHENYL]-3,4-DIMETHYL- Δ²-1,2,4-TRIAZOLIN-5-ONE (COMPOUND 39)

This compound was prepared in a manner analogous to that of Example 2, using 0.95 g (0.008 mole) of

1-(5-amino-4-bromo-2-fluorophenyl)-3,4-dimethyl-Δ²-1,2,4-triazolin-5-one (prepared as in Example

11), 1.0 g (0.008 mole) of ethanesulfonyl chloride, and 0.87 g of triethylamine in 25 ml of methylene chloride. The yield of 1-[4-bromo-2-fluoro-5-[bis-(N-ethylsulfonyl)amino]phenyl]-3,4-dimethyl-Δ²-1,2,4-triazolin-5-one was 1.4 g; m.p. 173-174.5°C.

The nmr spectrum was consistent with the proposed structure.

Analysis calc'd for

C₁₄H₁₈BrFN₄O₅S₂: C 36.64; H 3.74; N 11.54; Found: C 33.72; H 3.57; N 10.64. EXAMPLE 13

SYNTHESIS OF 1-(5-AMINO-2,4-DICHLOROPHENYL)-3- METHYL-4-DIFLUOROMETHYL-Δ²-1,2,4-TRIAZOLIN-5- ONE AS AN INTERMEDIATE

Step A Synthesis of Pyruvic Acid, 2,4-Dichlorophenylhydrazone as an Intermediate

To a stirred solution of 16.2 g (0.07 mole) of commercially available 2,4-dichlorophenylhydrazine hydrochloride in 100 ml of ethanol was added in one portion 9.2 g (0.11 mole) of pyruvic acid in 100 ml of water. The reaction mixture was stirred for 10 minutes and the resultant solid collected by filtration to yield when dried 13.5 g of pyruvic acid, 2,4-dichlorophenylhydrazone, m.p. 193-194°C. The reaction was repeated several times.

Step B Synthesis of 1-(2,4-Dichlorophenyl)-3- methyl-Δ²-1,2,4-triazolin-5-one as an

Intermediate

This compound was prepared in a manner analogous to that of Example 1, Step E using 13.6 g (0.054 mole) of pyruvic acid, 2,4-dichlorophenylhydrazone, 14.9 g

(0.054 mole) of diphenylphosphoryl azide, and 5.5 g

(0.054 mole) of triethylamine in 100 ml of toluene. The yield of 1-(2,4-dichlorophenyl) -3-methyl-Δ²-

1,2,4-triazolin-5-one was 13.0 g; m.p. 174-175°C. The reaction was repeated several times.

Step C Synthesis of 1-(2,4-Dichlorophenyl)-3- methyl-4-difluoromethyl-Δ²-1,2,4-triazolin- 5-one as an Intermediate This compound was prepared in a manner analogous to that of Example 1, Step F using 16.0 g (0.065 mole) of 1-(2,4-dichlorophenyl)-3-methyl-Δ²-1,2,4-triazolin-5-one, chlorodifluoromethane, 7.3 g (0.13 mole) of potassium hydroxide and 10.5 g (0.03 mole) of tetrabutylammonium bromide in 150 ml of tetrahydrofuran. The yield of 1-(2,4-dichlorophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one was 4.1 g; m.p. 108-110°C. The reaction was repeated several times.

Step D Synthesis of 1-(2,4-Dichloro-5-nitrophenyl)- 3-methyl-4-difluoromethyl-Δ²-1,2,4- triazolin-5-one as an Intermediate

This compound was prepared in the manner of

Example 1, Step G using 4.0 g (0.013 mole) of 1-(2,4-dichlorophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one and 1.2 ml (0.015 mole) of 70% nitric acid in 20 ml of concentrated sulfuric acid. The yield of 1-(2,4-dichloro-5-nitrophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one was 3.0 g; m.p. 95-97ºC. The reaction was repeated several times.

Step E Synthesis of 1-(5-Amino-2,4-dichlorophenyl)- 3-methyl-4-difluoromethyl-Δ ²-1,2,4- triazolin-5-one as an Intermediate

This compound was prepared in a manner analogous to that of Example 1, Step H using 2.5 g (0.007 mole) of 1-(2,4-dichloro-5-nitrophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one and 2.5 g (0.045 mole) of powdered iron in 6 ml of water and 60 ml of water. The yield of 1-(5-amino-2,4-dichlorophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one was 2.0 g; m.p. 133-135ºC. The reaction was repeated several times.

EXAMPLE 14 SYNTHESIS OF 1-[2,4-DICHLORO-5-[BIS-(N-METHYL¬

SULFONYL)AMINO]PHENYL]-3-METHYL-4-DIFLUOROMETHYL- Δ²-1,2,4-TRIAZOLIN-5-ONE (COMPOUND 22)

This compound was prepared in a manner analogous to that of Example 2 using 1.2 g (0.004 mole) of

1-(5-amino-2,4-dichlorophenyl)-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one (prepared as in

Example 13), 0.97 g (0.009 mole) of methanesulfonyl chloride, and 0.95 g (0.009 mole) of triethylamine in 15 ml of methylene chloride. The yield of 1-[2,4-dichloro-5-[bis(N-methylsulfonyl)amino3phenyl]-3-methyl- 4-difluoromethyl-Δ²-1,2,4-triazolin-5-one was 1.3 g; m.p. 213-214°C.

The nmr spectrum was consistent with the proposed structure.

Analysis calc'd for

C₁₂H₁₂Cl₂F₂N₄O₅S₂: C 30.91; H 2.59; N 12.02; Found: C 31.15; H 2.43; N 12.03.

EXAMPLE 15

SYNTHESIS OF 1-[2,4-DICHL0R0-5-(N-METHYL¬

SULFONYLAMINO) PHENYL]-3-METHYL-4-DIFLUORO¬

METHYL-Δ²-1,2,4-TRIAZOLIN-5-ONE (COMPOUND 1)

This compound was prepared in a manner analogous to that of Example 3 using 0.8 g (0.002 mole) of

1-[2,4-dichloro-5-[bis(N-methylsulfonyl)amino]phenyl]-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one

(prepared as in Example 14) and 0.14 g (0.003 mole) of sodium hydroxide in 0.3 ml of water and 10 ml of ethanol. The yield of 1-[2,4-dichloro-5-(N-methylsul fonylamino)phenyl]-3-methyl-4-difluoromethyl-Δ²-1,2,4-triazolin-5-one was 0.5 g; m.p. 75-78°C.

C₁₁H₁₀Cl₂F₂N₄O₃S: C 34.21; H 2.59; N 14.51; Found: C 33.98; H 2.62; N 14.20.

EXAMPLE 16 SYNTHESIS OF 1-(5-AMINO-2,4-DICHLOROPHENYL)-3- METHYL-Δ²-1,2,4-TRIAZOLIN-5-ONE AS AN INTERMEDIATE

Step A Synthesis of 1-(2,4-Dichloro-5-nitrophenyl)- 3-methyl-Δ²-1,2,4-triazolin-5-one as an

Intermediate

This compound was prepared in a manner analogous to that of Example 1, Step G using 6.0 g (0.025 mole) of 1-(2,4-dichlorophenyl)-3-methyl-Δ²-1,2,4-triazolin-5-one (prepared as an Example 13, Step B) and

1.9 ml (0.03 mole) of 70% nitric acid in 25 ml of concentrated sulfuric acid. The yield of 1-(2,4-dichloro-5-nitrophenyl)-3-methyl-Δ²-1,2,4-triazolin-5-one was 5.6 g as a solid.

Step B Synthesis of 1-(5-Amino-2,4-dichlorophenyl)- 3-methyl-Δ²-1,2,4-triazolin-5-one as an

Intermediate

To a 500 ml Parr hydrogenation bottle was added

0.5 g of platinum oxide, 100 ml of ethanol, then 6.4 g

(0.022 mole) of 1-(2,4-dichloro-5-nitrophenyl)-3-methyl-Δ²-1,2,4-triazolin-5-one. The bottle was placed in a Parr hydrogenator and the reaction mixture shaken until the theoretical amount of hydrogen was taken up. The bottle was removed from the hydrogenator and the reaction mixture filtered. The filtrate was dried with sodium sulfate and refiltered. The filtrate was concentrated under reduced pressure to yield 4.5 g of 1-(5-amino-2,4-dichlorophenyl)-3-methyl-Δ²-1,2,4-triazolin-5-one.

The nmr spectrum was consistent with the proposed structure.

EXAMPLE 17

SYNTHESIS OF 1-[2,4-DICHLORO-5-[BIS(N-ETHYL¬

SULFONYL)AMINO]PHENYL]-3-METHYL-4-ETHYL¬

SULFONYL-Δ²-1,2,4-TRIAZOLIN-5-ONE (COMPOUND 36) This compound was prepared in a manner analogous to that of Example 2, using 0.5 g (0.002 mole) of

1-(5-amino-2,4-dichlorophenyl)-3-methyl-Δ²-1,2,4-triazolin-5-one (prepared as in Example 16), 0.8 g

(0.006 mole) of ethanesulfonyl chloride and 0.7 g (0.007 mole) of triethylamine in 15 ml of methylene chloride. The yield of 1-[2,4-dichloro-5-[bis(N-ethylsulfonyl)amino]phenyl]-3-methyl-4-ethylsulfonyl-Δ²-1,2,4-triazolin-5-one was 0.5 g; m.p. 215-216°C.

Analysis calc'd for

C₁₅H₂₀Cl₂N₄O₇S₃: C 33.64; H 3.77; N 10.46; Found: C 33.88; H 3.91; N 10.68.

EXAMPLE 18

SYNTHESIS OF 1-[2,4-DICHLORO-5-(N-ETHYLSULFONYLAMINO) PHENYL]-3-METHYL-Δ²-1,2,4- TRIAZOLIN-5-ONE This compound was prepared in a manner analogous to that of Example 3, using 0.9 g (0.002 mole) of 1-[2,4-dichloro-5-[bis(N-ethylsulfonyl)amino]phenyl-3-methyl-4-ethylsulfonyl-Δ²-1,2,4-trιazolin-5-one

(prepared as in Example 17) and 0.2 g (0.005 mole) sodium hydroxide in 0.25 ml of water and 12 ml of ethanol. The yield of 1-[2,4-dichloro-5-(N-ethylsulfonylamino)phenyl]-3-methyl-Δ²-1,2,4-triazolin- 5-one was 0.5 g; m.p. 221-222.5°C.

C₁₀H₁₀Cl₂F₂N₄O₃S: C 34.21; H 2.58; N 14.51; Found: C 33.98; H 2.62; N 14.20. HERBICIDAL ACTIVITY The plant test species used in demonstrating the herbicidal activity of compounds of this invention include cotton (Gossypium hirsutum var. Stoneville), soybean (Glycine max var. Williams), field corn (Zea mays var. Agway 595S), rice (Oryza sativa var. Labelle), wheat (Triticum aestivium var. Prodax), field bindweed (Convolvulus arvensis), morningglory ( Ipomea lacunosa or Ipomea hederacea), velvetleaf (Abutilon theophrasti), barnyardgrass (Echinochloa crus galli), green foxtail (Setaria viridis), and johnsongrass ( Sorghum halepense). Seeds or tubers of the plant test species were planted in furrows in steam sterilized sandy loam soil contained in disposable fiber flats. A topping soil of equal portions of sand and sandy loam soil was placed uniformly on top of each flat to a depth of approximately 0.5 cm. The flats for the preemergence test were watered, then drenched with the appropriate amount of a solution of the test compound in a 50/50 mixture of acetone and water containing a small amount (up to 0.5% v/v) of sorbitan monolaurate emulsifier/solubilizer. The con centration of the test compound in solution was varied to give a range of application rates, generally 8.0 kg/ha and submultiples thereof. The flats were placed in a greenhouse and watered regularly at the soil surface for 21 days at which time phytotoxicity data were recorded.

The flats for the postemergence test were placed in a greenhouse and watered for 8-10 days, then the foliage of the emerged test plants was sprayed with a solution of the test compound in acetone-water containing up to 0.5% sorbitan monolaurate. After spraying the foliage was kept dry for 24 hours, then watered regularly for 21 days, and phytotoxicity data recorded.

Phytotoxicity data were taken as percent control. Percent control was determined by a method similar to the 0 to 100 rating system disclosed in "Research Methods In Weed Science," 2nd ed., B. Truelove, Ed.; Southern Weed Science Society; Auburn Unversity, Auburn, Alabama, 1977. The present rating system is as follows:

Herbicide Rating System

Rating Description

Percent of Main Crop Weed

Control Categories Description Description

No effect No crop reduction No weed control or injury

10 Slight discoloraVery poor weed tion or stunting control

20 Slight Some discoloraPoor weed effect tion, stunting or control stand loss

30 Crop injury more Poor to defipronounced but not cient weed lasting control

40 Moderate injury, Deficient weed crop usually control recovers

50 Moderate Crop injury more Deficient to effect lasting, recovery moderate weed control

60 Lasting crop Moderate weed injury no recovery control

70 Heavy injury and Control somestand loss what less than satisfactory

80 Severe Crop nearly desSatisfactory effect troyed a few to good weed survivors control

90 Only occasional Very good to live plants left excellent control

100 Complete Complete crop Complete weed effect destruction destruction Herbicidal data at selected application rates are given for various compounds of the invention in Table 3 and 4 below. The test compounds are identified in the tables below by numbers which correspond to those in Table 1.

In the tables of herbicidal data below:

"kg/ha" is kilograms per hectare, and

"% C" is percent control.

It is clear that the generic class of aryltriazolinones and thiones described and illustrated herein is characterized by herbicidal activity, and that the degree of this activity varies among specific compounds within this class and to some extent among the species of plant to which these compounds may be applied. Thus, selection of a specific herbicidal compound for control of a specific plant may readily be made.

For herbicidal application, the active compounds as above defined are formulated into herbicidal compositions, by admixture, in her-bicidally effective amounts, with adjuvants and carriers normally employed in the art for facilitating the dispersion of active ingredients for the particular utility desired, recognizing the fact that the formulation and mode of application of a toxicant may affect the activity of the material in a given application. Thus, for agricultural use the present herbicidal compounds may be formulated as granules of relatively large particle size, as water-soluble or water-dispersible granules, as powdery dusts, as wettable powders, as emulsifiable concentrates, as solutions, or as any of several other known types of formulations, depending on the desired mode of application.

For preemergence application these herbicidal compositions are usually applied either as sprays, dusts, or granules in the areas in which suppression of vegetation is desired. For postemergence control of established plant growth, sprays or dusts are most commonly used. These formulations may contain as little as 0.5% to as much as 95% or more by weight of active ingredient.

Dusts are free flowing admixtures of the active ingredient with finely divided solids such as talc, natural clays, kieselguhr, flours such as walnut shell and cottonseed flours, and other organic and inorganic solids which act as dispersants and carriers for the toxicant; these finely divided solids have an average particle size of less than about 50 microns. A typical dust formulation useful herein is one containing 1.0 part of the herbicidal compound and 99.0 parts of talc. Wettable powders, also useful formulations for both pre- and postemergence herbicides, are in the form of finely divided particles which disperse readily in water or other dispersant. Th.e wettable powder is ultimately applied to the soil either as a dry dust or as an emulsion in water or other liquid. Typical carriers for wettable powders include Fuller's earth, kaolin clays, silicas, and other highly absorbent, readily wet inorganic diluents. Wettable powders normally are prepared to contain about 5-80% of active ingredient, depending on the absorbency of the carrier, and usually also contain a small amount of a wetting, dispersing or emulsifying agent to facilitate dispersion. For example, a useful wettable powder formulation contains 80.8 parts of the herbicidal compound, 17.9 parts of Palmetto clay, and 1.0 part of sodium lignosulfonate and 0.3 part of sulfonated aliphatic polyester as wetting agents. Frequently, additional wetting agent and/or oil will be added to the tank-mix for postemergence application to facilitate dispersion on the foliage and absorption by the plant. Other useful formulations for herbicidal applications are emulsifiable concentrates. Emulsifiable concentrates are homogeneous liquid or paste compositions dispersible in water or other dispersant, and may consist entirely of the herbicidal compound and a liquid or solid emulsifying agent, or may also contain a liquid carrier, such as xylene, heavy aromatic naphthas, isophorone, or other non-volatile organic solvent. For herbicidal application these concentrates are dispersed in water or other liquid carrier, and normally applied as a spray to the area to be treated. The percentage by weight of the essential active ingredient may vary according to the manner in which the composition is to be applied, but in general comprises 0.5 to 95% of active ingredient by weight of the herbicidal composition.

Typical wetting, dispersing, or emulsifying agents used in agricultural formulations include, for example, the alkyl and alkylaryl sulfonates and sulfates and. their sodium salts, polyhydric alcohols, and other types of surface active agents, many of which are available in commerce. The surface active agent, when used, normally comprises 1% to 15% by weight of the herbicidal composition. For instance an emulsifiable concentrate may have the following composition (in % by weight):

Active ingredient A 40.00

Antimicrobial agent 0.05

Foam suppressant 0.10

Surfactant C 2.60

Surfactant D 0.40

Thickener 0.35

Suspending agent 0.45

Propylene glycol (antifreeze) 6.00

Water 50.05

Total 100.00 The antimicrobial agent is sodium o-phenylphenate tetrahydrate sold under the trademark and designation "Dowacide A". The foam suppressant is a water dilutable silicone emulsion sold under the trademark and designation "Dow Corning AF". Surfactant C is a non-ionic paste of a condensate of ethylene oxide with a hydrophobic base formed by condensing propylene oxide with propylene glycol, sold under the trademark and designation "Pluronic P-84." Surfactant D is an anionic liquid comprising the sodium salt of a complex organic phosphate ester, sold under the trademark and designation "GAFAC LO-529." The thickener is a xanthan gum sold under the trademark and designation "Kelzan-M". The suspending agent is a colloidal magnesium aluminum silicate sold under the trademark and designation

"Veegum." In use, by the farmer, this concentrate may be diluted with water to provide an aqueous composition containing, say about 1/4% to 1 1/2% of the active ingredient, for use on the field. Other useful formulations for herbicidal applications include simple solutions of the active ingredient in a solvent in which it is completely soluble at the desired concentration, such as acetone, alkylated naphthalenes, xylene, or other organic solvents. Thus a suitable solution may contain, for instance, some 65% of the active ingredient, together with a minor proportion (say 1 to 10%) of a surfactant; for use on the field, this solution may be diluted with water, by the farmer, to provide an aqueous composition containing, say about 1/4% to 1 1/2% of the active ingredient.

Granular formulations, wherein the toxicant is carried on relatively coarse particles, are of particular utility for aerial distribution or for penetration of cover crop canopy. Pressurized sprays, typically aerosols wherein the active ingredient is dispersed in finely divided form as a result of vaporization of a low boiling dispersant solvent carrier , such as the Freons, may also be used. Water-soluble or water-dispersible granules are also useful formulations for herbicidal application of the present compounds. Such granular formulations are free-flowing, non-dusty, and readily water-soluble or water-miscible. The soluble or dispersible granular formulations described in U.S. patent No. 3,920,442 are useful herein with the present herbicidal compounds; these may be diluted with water, by the former, to provide an aqueous composition containing say about 1/4 to 1 1/2% of the active ingredient, for use on the field.

The active herbicidal compounds of this invention may be formulated and/or applied with insecticides, fungicides, nematicides, plant growth regulators, fertilizers, or other agricultural chemicals and may be used as effective soil sterilants as well as selective herbicides in agriculture. In applying an active compound of this invention, whether formulated alone or with other agricultural chemicals, an effective amount and concentration of the active compound is of course employed; the amount may be as low as 15 g/ha or lower, e.g. about 10 to 500 g/ha such as 50, 100, 200 or 300 g/ha.

The active herbicidal compounds of this invention may be used in combination with other herbicides, e.g. they may be mixed with, say, an equal or larger amount of a known herbicide such as chloroacetanilide herbicides such as 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide (alachlor), 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)-acetamide (metolachlor), and N-chloroacetyl-N-(2,6-diethylphenyl)glycine (diethatyl-ethyl); benzothiadiazinone herbicides such as 3-(1-methylethyl)- (1H)-2,1,3-benzothiadiazin-4-(3H)-one-2,2-dioxide (bentazon); triazine herbicides such as 6-chloro-N-ethyl-N-(1-methylethyl)-1,3,5-triazine-2,4-diamine (atrazine), and 2- [4-chloro-6-(ethylamino)-1,3,5-triazin-2-yl]amino -2- methylpropanenitrile (cyanazine); dinitrolaniline herbicides such as 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzeneamine (trifluralin); and aryl urea herbicides such as N'-(3,4-dichlorophenyl)-N,N-dimethylurea (diuron) and N,N-dimethyl-N'-[3-(trifluoromethyl)phenyl ]urea (fluometuron); and other heterocyclic nitrogen herbicides such as 2-(2-(chlorophenyi)methyl)-4, 4-dimethyl-3-isoxazolidinone..

It is apparent that various modifications may be made in the formulation and application of the compounds of this invention without departing from the inventive concepts herein as defined in the claims.

Tab le I

Representative Compounds

Cpd X Y R R' R² R³

1 Cl Cl CH₃ H CHF₂ CH₃

2 F F CH₃ H CHF₂ CH₃

3 F Cl CH₃ H CHF₂ CH₃

4 F Br CH₃ H CHF₂ CH₃

5 F CH₃ CH₃ H CHF₂ CH₃

6 CH₃ CH₃ CH₃ H CHF₂ CH₃

9 Cl Cl C₂H₅ H CHF₂ CH₃

10 F F C₂H₅ H CHF₂ CH₃

11 F Cl C₂H₅ H CHF₂ CH₃

12 F Br ^C2^H5 H CH₃ CH₃

13 F Br C₂H₅ H CHF₂ CH₃

14 CH₃ CH₃ C₂H₅ H CHF₂ CH₃

15 F Br C₂H₅ H (CH₂)₃F CH₃

16 Cl Cl n-C₃H₇ H CHF₂ CH₃

17 F F n-C₃H₇ H CHF₂ CH₃

18 F Cl n-C₃H₇ H CHF₂ CH₃

19 F Br n-C₃H₇ H CHF₂ CH₃

20 F Cl CH₃ C₂H₅ CHF₂ CH₃

21 F Cl CH₃ n- C₃H₇ CHF₂ CH₃

22 Cl Cl CH3 SO₂CH₃ CHF₂ CH₃ Cpd X Y R R¹ R² R³

23 F F CH₃ SO₂CH₃ CHF₂ CH₃

24 F Cl CH₃ SO₂CH₃ CHF₂ CH₃

25 F Br CH₃ SO₂CH₃ CHF₂ CH₃

26 F CH₃ CH₃ SO₂CH₃ CHF₂ CH₃

27 CH₃ CH₃ CH₃ SO₂CH₃ CHF₂ CH₃

28 F Cl CH₃ SO₂C₂H₅ CHF₂ CH₃

29 F Cl C₂H₅ CH₃ CHF₂ CH₃

30 F Cl C₂H₅ ^C2^H5 CHF₂ CH₃

31 F Cl C₂H₅ n-C₃H₇ CHF₂ CH₃

32 F Cl ^C2^H5 1-C₃H₇ CHF₂ CH₃

33 F Cl C₂H₅ CH₂OCH₃ CHF₂ CH₃

35 Cl Cl C₂H₅ SO₂C₂H₅ CHF₂ CH₃

36 Cl Cl C₂H₅ SO₂C₂H₅ SO₂C₂H₅ CH₃

37 F F C₂H₅ SO₂C₂H₅ CHF₂ CH₃

38 F Cl C₂H₅ SO₂C₂H₅ CHF₂ CH₃

39 F Br C₂H₅ SO₂C₂H₅ CH₃ CH₃

40 F Br C₂H₅ SO₂C₂H₅ CHF₂ CH₃

41 CH₃ CH₃ C₂H₅ SO₂C₂H₅ CHF₂ CH₃

42 F Br C₂H₅ SO₂C₂H₅ (CH₂)₃F CH₃

43 Cl Cl n-C₃H₇ SO₂C₃H₇(n) CHF₂ CH₃

44 F F n-C₃H₇ SO₂C₃H₇(n) CHF₂ CH₃

45 F Cl n-C₃H₇ SO₂C₃H₇(n) CHF₂ CH₃

46 F Br n-C₃H₇ SO₂C₃H₇(n) CHF₂ CH₃

47 F Cl CH₃ CH₃ CHF₂ CH₃

48 F Cl CF₃ H CHF₂ CH₃ Cpd X Y R R¹ R² R³

49 F Cl CH₃ C₄H₉ CHF₂ CH₃

50 Cl Cl CH₃ C₂H₅ CHF₂ CH₃

51 Cl Cl CH₃ C₃H₇ CHF₂ CH₃

52 Cl Cl CH₃ C₄H₉ CHF₂ CH₃

53 F Cl C₆H₅ H CHF₂ CH₃

54 F Cl N(CH₃ )₂ H CHF₂ CH₃

55 F Cl N(C₂H₅)₂ H CHF₂ CH₃

56 F Cl OH H CHF₂ CH₃

57 F Cl CH₃ CHF₂ CHF₂ CH₃

58 Cl F CH₃ SO₂CH₃ CHF₂ CH₃

59 Cl F C₂H₅ SO₂C₂H₅ CHF₂ CH₃

60 Cl F CH₃ H CHF₂ CH₃

61 Cl F C₂H₅ H CHF₂ CH₃

62 CH₃ Cl CH₃ SO₂CH₃ CHF₂ CH₃

63 CH₃ Cl CH₃ H CHF₂ CH₃

64 F NO₂ CH₃ SO₂CH₃ CHF₂ CH₃

65 F NO₂ CH₃ H CHF₂ CH₃

66 F CCHF₂ CH₃ SO₂CH₃ CHF₂ CH₃

67 F CCHF₂ CH₃ H CHF₂ CH₃

68 F CF₃ CH₃ SC₂CH₃ CHF₂ CH₃

69 F CF₃ CH₃ H CHF₂ CH₃

70 F Cl -(CH₂)₃- CHF₂ CH₃

71 F Cl -(CH₂)₄- CHF₂ CH₃

72 F Cl -(CH₂)₅- CHF₂ CH₃

73 F Cl -(CH₂)₆- CHF₂ CH₃

74 F Cl CH₂COOH H CHF₂ CH₃ Cpd X Y R R¹ R² R³

75 F Cl CH₃ OCH₃ CHF₂ CH₃

76 F Cl CH₃ CH ₂CH₂CH₂F CHF₂ CH₃

77 F Cl CH₃ H CHF₂ OCH₃

78 F Cl CH₃ SO₂CH₃ CHF₂ OCH₃

79 F Cl CH₃ SO₂CH₃ CHF₂ Cl

80 F Cl CH₃ H CHF₂ Cl

81 F Cl CH₃ H CHF₂ H

82 F Cl CH₃ H CHF₂ SO₂CH₃

83 F Cl CH₃ H CHF₂ SOCH₃

84 F Cl CH₃ H CHF₂ SCH₃

88 Br Cl CH₃ H CHF₂ CH₃

89 Br Br CH₃ H CHF₂ CH₃

90 Br CF₃ CH₃ H CHF₂ CH₃

91 F Cl CH₃ CH₂COOH CHF₂ CH₃

92 F Cl C₂H₅ CH₂COOH CHF₂ CH₃

Other representative compounds are those whtch are Identical with ccmpounds 20, 21, 29-33 and 47-87, 91 and 92 respectively, except that X Is F and Y is Br. Still other representative ccmpounds are those which are identical with Compounds 1 to 87, 91 and 92 respectively, except that X is F and Y is CF₃. Other representative compounds are those that are identical to compounds 9 to 87, 91 and 92 respectively, except that X is Br. Other representative compounds are those which are identical with Compounds 1-19, 48, 53-56, 60, 61, 63, 65, 67, 69, 71, 74, 77, 80-92, respectively, except that R¹ is Na (or other salt-forming group).

Compounds In which R¹ is H, such as compound 1, used preemergently have shown a selectivity favorable to soybeans. Compounds in which R¹ is alkyl, such as compound 31, used preemergently, have shown a selectivity favorable to cotton. Compound 1 pre-emergently applied also shows good corn tolerance. These are effective at low rates of application.

Table 3

Preemergence Herbicidal Activity (% Control)

Compound No. 1 2 3 4 5 6

Rate (kg/ha) 0.5 1.0 0.25 0.25 0.5 1.0

Species

Cotton 95 100 100 100 95 40

Soybean 50 60 50 50 80 60

Field Corn 100 10 95 100 100 70

Rice 95 10 90 100 100 50

Wheat 50 20 90 90 95 30

Field Bindweed 100 50 100 100 95 100

Morningglory 95 90 90 95 100 70

Velvetleaf 100 100 100 100 100 100

Barnyardgrass 95 80 95 100 100 95

Green Foxtail 100 90 90 100 100 100

Johnsongrass 95 70 90 95 100 90

Compound No. 9 10 11 12 13 14 15

Rate (kg/ha) 0.5 1.0 0.25 0.25 0.25 1.0 0.5

Species

Cotton 100 90 100 50 95 40 90

Soybean 20 30 40 10 30 40 10

Field Corn 95 20 95 10 80 80 90

Rice 80 10 95 60 90 30 80

Wheat 20 10 30 0 40 30 20

Field Bindweed 100 80 100 60 100 90 90

Morningglory 95 90 100 70 100 70 100

Velvetleaf 100 100 100 80 100 90 100

Barnyardgrass 80 70 100 10 100 90 100

Green Foxtail 70 100 100 30 100 90 95

Johnsongrass 80 70 90 50 90 90 90

Table 3

(Continued)

Compound No. 16 17 18 19 20 21

Rate (kg/ha) 2.0 1.0 0.25 0.25 0.25 0.25

Species

Cotton 90 90 70 80 95 95

Soybean 10 30 10 30 95 100

Field Corn 90 40 95 95 100 100

Rice 80 70 70 80 100 100

Wheat 20 20 20 10 95 100

Field Bindweed 100 60 100 100 100 100

Morningglory 100 80 70 70 100 100

Velvetleaf 100 100 100 100 100 100

Barnyardgrass 95 70 80 95 100 100

Green Foxtail 95 30 70 95 100 100

Johnsongrass 70 50 70 70 100 100

Compound No. 22 23 24 25 26 27

Rate (kg/ha) 0.5 0.25 0.25 0.25 0.5 1.0

Species

Cotton 95 95 100 95 95 40

Soybean 70 30 90 100 100 80

Field Corn 90 20 100 95 100 100

Rice 90 10 100 95 95 20

Wheat 80 20 95 95 100 40

Field Bindweed 100 30 95 80 100 80

Morningglory 100 70 100 100 95 60

Velvetleaf 100 100 100 100 100 90

Barnyardgrass 100 70 100 100 100 80

Green Foxtail 100 40 100 100 100 100

Johnsongrass 100 60 100 100 100 90

Table 3

(Continued)

Compound No. 28 29 30 31 32 33 35

Rate (kg/ha) 0.25 0.25 0.25 0.25 0.5 0.25 1.0

Species

Cotton 100 90 100 90 100 100 100

Soybean 90 90 100 100 95 100 80

Field Corn 100 100 100 100 100 100 100

Rice 100 95 95 100 100 100 80

Wheat 95 80 90 100 100 100 95

Field Bindweed 100 100 100 100 100 100 100

Morningglory 100 100 100 100 100 100 100

Velvetleaf 100 100 100 100 100 100 100

Barnyardgrass 100 100 100 100 100 100 100

Green Foxtail ιoσ 100 100 100 100 100 100

Johnsongrass 100 100 100 100 100 100 100

Compound No. 36 37 38 39 40 41 42

Rate (kg/ha) 4.0 0.25 1.0 0.25 1.0 1.0 0.25

Species

Cotton 0 80 100 40 100 30 80

Soybean 0 40 100 20 90 40 80

Field Corn 0 90 100 50 95 100 100

Rice 10 50 100 20 95 40 80

Wheat 0 80 100 10 100 40 30

Field Bindweed 0 70 100 40 100 90 70

Morningglory 0 90 100 60 100 80 100

Velvetleaf 0 100 100 95 100 90 100

Barnyardgrass 10 95 100 30 100 100 95

Green Foxtail 20 100 100 30 100 100 90

Johnsongrass 20 95 100 90 100 95 95

Table 3

(Continued)

Compound No. 43 44 45 46 47 48 49

Rate (kg/ha) 0.5 0.25 0.25 0.25 0.25 2.0 0.25

Species

Cotton 10 0 30 30 95 100 80

Soybean 10 0 30 80 95 20 100

Field Corn 70 95 100 100 95 60 100

Rice 20 60 80 50 95 80 95

Wheat 10 70 70 70 95 30 100

Field Bindweed 30 60 50 90 100 100 100

Morningglory 50 60 80 95 100 100 100

Velvetleaf 20 100 100 100 100 100 100

Barnyardgrass 80 90 100 90 100 100 100

Green Foxtail 90 90 95 100 100 100 100

Johnsongrass 70 90 95 100 100 100 100

Table 4

Postemergence Herbicidal Activity (% Control)

Compound No. 1 2 3 4 5 6

Rate (kg/ha) 0.5 1.0 0.25 0.25 0.5 1.0

Species

Cotton 100 100 100 100 100 80

Soybean 60 80 60 80 80 60

Field Corn 40 30 70 80 70 50

Rice 95 20 90 95 80 50

Wheat 80 40 50 70 80 40

Field Bindweed 100 60 80 95 100 50

Morningglory 100 95 100 95 95 95

Velvetleaf 100 100 100 100 100 50

Barnyardgrass 100 50 100 95 100 50

Green Foxtail 95 70 100 80 100 80

Johnsongrass 100 40 70 70 90 50 Table 4

(Continued)

Compound No. 9 10 11 12 13 14 15

Rate (kg/ha) 0.5 1.0 0.25 0.25 0.25 1.0 0.5

Species

Cotton 100 100 100 30 90 70 100

Soybean 40 70 80 40 70 50 70

Field Corn 40 30 60 20 90 30 70

Rice 90 20 90 40 80 20 50

Wheat 80 40 50 10 30 30 100

Field Bindweed 100 40 100 10 100 70 80

Morningglory 100 90 95 30 100 90 90

Velvetleaf 100 100 100 10 100 50 100

Barnyardgrass 95 50 80 40 95 50 80

Green Foxtail 100 40 80 40 95 90 40

Johnsongrass 95 30 70 30 60 80 90

Compound No. 16 17 18 19 20 21

Rate (kg/ha) 2.0 1.0 0.25 0.25 0.25 0.25

Species

Cotton 100 60 60 100 100 100

Soybean 40 40 50 70 95 100

Field Corn 100 20 40 80 100 100

Rice 80 30 80 70 100 100

Wheat 40 30 30 30 80 100

Field Bindweed 100 50 80 90 100 100

Morningglory 100 80 70 90 100 100

Velvetleaf 100 70 100 100 100 100

Barnyardgrass 100 40 70 90 100 100

Green Foxtail 95 40 95 70 - -

Johnsongrass 80 30 30 60 90 100

Table 4

(Continued)

Compound No. 22 23 24 25 26 27

Rate (kg/ha) 0.5 0.25 0.25 0.25 0.5 1.0

Species

Cotton 100 40 100 100 100 40

Soybean 50 40 90 95 95 60

Field Corn 70 20 90 95 80 70

Rice 90 0 80 95 50 20

Wheat 40 20 70 95 80 50

Field Bindweed 100 20 95 100 95 30

Morningglory 100 20 95 100 100 70

Velvetleaf 100 30 100 100 100 20

Barnyardgrass 100 20 90 100 100 70

Green Foxtail 100 20 95 100 100 100

Johnsongrass 100 20 95 100 100 70

Compound No. 28 29 30 31 32 33

Rate (kg/ha) 0.25 0.25 0.25 0.25 0.5 0.25

Species

Cotton 100 95 100 95 100 100

Soybean 95 95 100 100 100 100

Field Corn 80 80 90 100 100 100

Rice 40 40 90 95 100 100

Wheat 70 70 90 100 100 100

Field Bindweed 90 30 95 100 100 90

Morningglory 95 90 100 100 100 100

Velvetleaf 100 70 100 100 100 100

Barnyardgrass 95 70 95 100 100 100

Green Foxtail 95 95 95 100 100 100

Johnsongrass 80 80 80 90 100 100

Table 4

(Continued)

Compound No. 35 36 37 38 39 40

Rate (kg/ha) 1.0 4.0 0.25 1.0 0.25 1.0

Species

Cotton 80 20 40 100 40 100

Soybean 60 10 40 100 40 90

Field Corn 100 10 70 100 10 100

Rice 80 10 30 100 20 100

Wheat 60 0 30 100 20 100

Field Bindweed 90 20 30 100 30 100

Morningglory 100 0 80 100 90 100

Velvetleaf 90 Q 100 100 60 100

Barnyardgrass 100 20 60 100 20 100

Green Foxtail 100 30 50 100 70 100

Johnsongrass 90 20 50 100 30 100

Compound No. 41 42 43 44 45 46

Rate (kg/ha) 1.0 0.25 1.0 1.0 1.0 0.25

Species

Cotton 40 95 95 40 90 100

Soybean 60 90 40 40 80 80

Field Corn 80 80 60 40 100 95

Rice 40 30 20 20 80 20

Wheat 50 40 10 40 80 60

Field Bindweed 30 40 0 50 95 100

Morningglory 50 60 90 50 95 100

Velvetleaf 30 100 40 40 100 100

Barnyardgrass 95 70 60 40 100 100

Green Foxtail 80 50 90 60 95 100

Johnsongrass 95 80 30 40 95 90

Table 4

(Continued)

Compound No. 47 48 49

Rate (kg/ha) 0.25 2.0 0.25

Species

Cotton 100 100 90

Soybean 95 95 100

Field Corn 80 100 100

Rice 80 50 95

Wheat 90 50 100

Field Bindweed 100 100 100

Morningglory 100 100 100

Velvetleaf 100 100 100

Barnyardgrass 95 95 100

Green Foxtail 95 95 100

Johnsongrass 95 80 100

Claims

CLAIMS :

1. An herbicidal compound characterized by the general formula

in which

X is Br, Cl, F or haloalkyl;

Y is Br, Cl, F, methyl, haloalkyl, nitro, or a radical of the formula R⁸OCH₂-, R⁸SCH₂-, R⁸SOCH₂- or

R⁸SO₂CH₂- where R⁸ is C₁-C₃alkyl, C₂-C₅alkenyl,

C₃-C₅alkynyl, phenyl, or substituted phenyl; R ³ is halogen, alkyl, haloalkyl, cyanoalkyl, arylalkyl, alkoxyalkyl, alkylthio, alkylsulfinyl, alkylsulfonyl, alkylthioalkyl, alkylsulfinylalkyl or alkylsulfonylalkyl; R ² i.s alkyl, alkoxy, haloalkyl, alkenyl, alkynyl, cyanoalkyl, thiocyanoalkyl, or a group of the formula -alkylene-Y' -R⁵ in which said alkylene group has 1 to 5 carbon atoms, Y' is oxygen or S(O)r in which r is 0 to 2, and R⁵ is alkyl, alkenyl or alkynyl;

R is alkyl, haloalkyl or aryl;

R¹ is hydrogen, a salt-forming group, alkyl, benzyl, haloalkyl, alkoxy, SO₂R, alkynyl, alkenyl, a group of the formula -alkylene-SO₂R, alkoxymethyl, cyanomethyl, carboxymethyl, or alkoxycarbonyl, or R and R₁ together is alkylene.

2. A compound as in claim 1 characteried in that X and Y are each halogen, R ² is CHF₂, R³ is

CH₃, R is lower alkyl and R¹ is hydrogen, a salt- forming group, lower alkyl or -SO₂R.

3. A compound as in claim 2 characterized in that X is Cl or Br, Y is Cl or Br, R is lower alkyl and R¹ is H or a salt-forming group.

4. A compound as in claim 2 characterized in that R is lower alkyl and R¹ is -SO₂R.

5. A compound as in claim 2 characterized in that R is lower alkyl and R¹ is lower alkyl.

6. An herbicidal composition characterized by an herbicidally effective amount of the compound of claim 1 in admixture with a suitable carrier.

7. A method for controlling undesired plant growth which is characterized by applying to the locus where control is desired an herbicidally effective amount of the composition of claim 6.

8. An herbicidal composition characterized by an herbicidally effective amount of the compound of claim 2 in admixture with a suitable carrier.

9. A method for controlling undesired plant growth which is characterized by applying to the. locus where control is desired an herbicidally effective amount of the composition of claim 8.

10. An herbicidal composition characterized by an herbicidally effective amount of the compound of claim 3 in admixture with a suitable carrier.

11. A method for controlling undesired plant growth which is characterized by applying to the locus where control is desired an herbicidally effective amount of the composition of claim 10.

12. An herbicidal composition characterized by an herbicidally effective amount of the compound of claim 4 in admixture with a suitable carrier.

13. A method for controlling undesired plant growth which is characterized by applying to the locus where control is desired an herbicidally effective amount of the composition of claim 12.

14. An herbicidal composition characterized by an herbicidally effective amount of the compound of claim 5 in admixture with a suitable carrier.

15. A method for controlling undesired plant growth which is characterized by applying to the locus where control is desired an herbicidally effective amount of the composition of claim 14.

16. A compound as in claim 3 in which R is methyl or ethyl.

17. A compound as in claim 3 in which R is methyl.

18. A method as in claim 11 including the steps of planting said locus with soybeans and applying said composition pre-emergently to said locus.

19. A method as in claim 15 including the steps of planting said locus with cotton and applying said composition preemergently to said locus.

20. Process which comprises treating a compound of the formula

to convert it to a compound of the formula

in which X and Y are each Br, Cl or F; R² is halo lower alkyl; R³ is lower alkyl, R is lower alkyl or halo lower alkyl; R¹ is hydrogen or a salt-forming group or lower alkyl; X¹ is hydrogen or the same as X; Y¹ is hydrogen or nitro or amino or the same as

Y; Z¹ is N(R¹)SO₂R or hydrogen or nitro or amino and R ^2a is hydrogen or the same as R², said process comprising a sequence of steps which includes the following in any order: halogenating to introduce the X and Y groups when either X¹ or Y¹ is not halogen, alkylsulfonating to introduce the N(R¹)SO₂R group when Z ¹ is not N(R¹)SO₂R, and haloalkylating to introduce the R ² group when R^2a is not R².