US3867426A

US3867426A - Herbicidal meta-bifunctional benzenes

Info

Publication number: US3867426A
Application number: US077677A
Authority: US
Inventors: John F Olin; Philip C Hamm
Original assignee: Monsanto Co
Current assignee: Monsanto Co
Priority date: 1970-10-02
Filing date: 1970-10-02
Publication date: 1975-02-18
Anticipated expiration: 1992-02-18

Abstract

Bi-substituted benzene compounds and their herbicidal use having the formula

WHEREIN A

Description

United States Patent [191 Olin et al.

1 51 Feb. 18,1975

1 1 HERBlClDAL META-BlFUNCTlONAL BENZENES [75] Inventors: John F. 01in, Ballwin; Philip C.

llamm, Glendale, both of Mo.

[73] Assignee: Monsanto Company, St. Louis, Mo.

[22] Filed: Oct. 2, 1970 [21] Appl. No: 77,677

A, 260/468 E, 260/479 C, 260/552 R,

Primary ExaminerLorraine A. Weinberger Assistant IixuminerL. Arnold Thaxton Attorney, Agent, or Firm-William T. Black [57] ABSTRACT Bi-substituted benzene compounds and their herbicidal use having the formula R z R2 N c N R wherein A is selected from the group I ll (2) N c Z R or (3) N c N R16 7 Claims, N0 Drawings HERBICIDAL META-BIFUNCTIONAL BENZENES This invention relates to novel meta-bifunctional substituted benzenes. This invention further relates to herbicidal compositions and methods of herbicidal use utilizing the novel meta-bifunctional substituted benzenes of this invention.

The novel meta-bifunctional substituted benzenes of this invention are of the formula R1 z R2 N-C-N-R wherein Z is selected from the group consisting of oxygen and sulfur; R is selected from the group consisting of hydrogen, alkyl having a maximum of 8 carbon atoms and alkenyl having a maximum of 6 carbon atoms; R is selected from the groupconsisting of hydrocarbyl selected from the group consisting of alkyl, alkenyl, alkynyl and cycloalkyl said alkyl, alkenyl and alkynyl having a maximum of 12 carbon atoms and said cycloalkyl having 3 to 7 ring carbon atoms and a maximum of 4 chain carbon atoms, alkoxy having a maximum of 6 carbon atoms, chloroalkyl having a maximum of 6 carbon atoms and a maximum of 3 halogen atoms, chloroalkenyl having a maximum of 6 carbon atoms and a maximum of 3 halogen atoms, cycloalkenyl havingS to 7 ring carbon atoms and a maximum of 4 chain carbon atoms, phenyl, substituted phenyl having a maximum of two substituents said substituents being selected from the group consisting of halogen, nitro and alkyl having a maximum of 4 carbon atoms, the group wherein R and R are each independently selected from the group consisting of hydrogen, alkyl having a maximum of 12 carbon atoms, alkenyl having a rnaximum of 3 carbon atoms, chloroalkyl having a maximum of 3 carbon atoms and a maximum of 3 halogen atoms, chloroalkenyl having a maximum of 3 carbon atoms and 3 halogen atoms; R is selected from the group consisting of halogen, alkyl having a maximum of 14 carbon atoms, chloroalkyl having a maximum of 3 carbon atoms and a maximum of 3 halogen atoms, nitro, and alkoxy having a maximum of 3 carbon atoms; and r is one of the integers zero to three; the group I I Rr -c-ca wherein R is selected fromthe group consisting of alkyl and alkenyl each having a maximum f4 carbon atoms, and R R R and r are as previously defined; and R is selected from the group consisting of hydrogen, alkyl having a maximum of 12 carbon atoms, and alkenyl having a maximum of 8 carbon atoms, R and R can with the nitrogen form the group selected from the group consisting of provided that when R or R is unsaturated the position of unsaturation is other than on the l-carbon atom; wherein R is alkyl having a maximum of 3 carbon atoms and s is one of the integers zero to two:

A is selected from the group consisting of 3 9 Z R 2 I Z C N wherein Z and Z are independently selected from the group consisting of oxygen or sulfur; R is selected from the group consisting of hydrocarbyl selected from the group consisting of alkyl, alkenyl, alkynyl and cycloalkyl said alkyl, alkenyl and alkynyl having a maximum of 12 carbon atoms and said cycloalkyl having 3 to 7 ring carbon atoms and a maximum of 4 chain carbon atoms, chloroalkyl having a maximum of 15 carbon atoms and a maximum of 3 halogen atoms, chloroalkenyl having a maximum of 12 carbon atoms and a maximum of 3 halogen atoms and alkoxyalkyl having a maximum of a total of 12 carbon atoms, the group CH (Cl-l OR wherein x is one of the integers zero to four and R is selected from the group consisting of phenyl, naphthyl, substituted phenyl and substituted naphthyl said substitution being a maximum of 3 substituents and said substituent being independently selected from halogen and alkyl having a maximum of 4 carbon atoms, CH CH=CH-phenyl, the group wherein R is selected from the group consisting of phenyl and naphthyl and R, R, R, R and r are as previously defined; R'" is selected from the group consisting of hydrogen, alkyl having a maximum of 12 carbon atoms, cycloalkyl having 5 to 7 carbon atoms, alkenyl having a maximum of 4 carbon atoms, chloroalkyl having a maximum of 6 carbon atoms and a maximum of 3 halogen atoms and chloroalkenyl having a maximum of4 carbon atoms and a maximum of 3 halogen atoms; provided that when R is a hydrocarbyl group having less than 9 carbon atoms then R", when a hydrocarbyl group, has at least 8 carbon atoms;

II R

wherein Z and Z are each independently selected from the group consisting of oxygen and sulfur; R is selected from the group consisting of hydrogen, alkyl having a maximum of 6 carbon atoms and alkenyl having a maximum of 6 carbon atoms; and R is selected from the group consisting of alkyl having a maximum of 8 carbon atoms, alkenyl having a maximum of 6 carbon atoms, cycloalkyl having from 3 to 7 ring carbon atoms, cyclohexenyl, phenyl, substituted phenyl having a maximum of two substituents said substituents being selected from the group consisting of halogen, nitro and alkyl having a maximum of 4 carbon atoms, the group 6 v R 1 R -C-CH wherein R R R, R and r are as previously defined; and

III -N-C-N-R atoms, and a maximum of 3 halogen atoms, chloroalkenyl having a maximum of 6 carbon atoms and a maximum of 3 halogen atoms, cycloalkyl having 3 to 7 ring carbon atoms and a maximum of4 chain carbon atoms, cycloalkenyl having 5 to 7 ring carbon atoms and a maximum of 4 chain carbon atoms, phenyl, substituted phenyl having a maximum of two substituents said substituents being selected from the group consisting of halogen, nitro and alkyl having a maximum of4 carbon atoms, the group wherein R, R R R and r are as previously defined; and R is selected from the group consisting of hydrogen, alkyl having a maximum of 12 carbon atoms and alkenyl having a maximum of 8 carbon atoms; R and R can with the nitrogen form the group selected from the group consisting of wherein R and s are as previously defined.

A preferred embodiment of this invention are the compounds wherein only one of R and R is alkenyl or chloroalkenyl and that R is other than alkenyl when either R or R is alkenyl or chloroalkenyl.

Another preferred embodiment of this invention is the class of compounds of the formula R1 z R2 1i c f: R3

wherein R, R, R, R, R", Z and Z are as previously defined in the above preferred embodiment.

Within this class of compounds preferred embodiments are those compounds in which R is hydrogen or alkyl having a maximum of 4 carbon atoms.

A further embodiment, within this class, are those compounds in which R is hydrogen and R is selected from the group consisting of chloroalkyl having a maximum of 6 carbon atoms and a maximum of 3 halogen atoms, chloroalkenyl having a maximum of 6 carbon atoms and a maximum of 3 halogen atoms, the group wherein R R, R R R R R, Z and r are as previ ously defined.

A still further embodiment, within this class, are those compounds in which R is hydrogen, R is selected from the group consisting of chloroalkyl having a maximum of 12 carbon atoms and a maximum of 3 halogen atoms, chloroalkenyl having a maximum of 8 carbon atoms and a maximum of 3 halogen atoms, CH CH=CH-phenyl and the group wherein R R Z Z Z, R R, R, R and r are as previously defined; and R is selected from the group consisting of hydrogen, alkyl having a maximum of 12 carbon atoms, cycloalkyl having 5 to 7 ring carbon atoms, alkenyl having a maximum of 4 carbon atoms, chloroalkyl having a maximum of 6 carbon atoms and a maximum of3 halogen atoms and chloroalkenyl having a maximum of 4 carbon atoms and a maximum of 3 halogen atoms.

Another preferred embodiment of this invention are the compounds of the formula I II N c N N c Z R I II 12 4 wherein R is selected from the group consisting of hydrogen and alkyl having a maximum of4 carbon atoms; and R is selected from the group consisting of hydrogen and alkyl having a maximum of 4 carbon atoms; and R R, Z, 2*, and R are as previously defined in the preferred embodiment.

Another embodiment, within this class, are those compounds in which R and R are both hydrogen.

A still further embodiment of this invention are those compounds of the formula 1 l 2 R Z R l N N N c N I 1; R 2

wherein R and R are each independently selected from the group consisting of hydrogen and alkyl having a maximum of4 carbon atoms; and R R R R, Z and Z are as previously defined in the preferred ebodiment.

The meta bifunctional compounds of this invention can be prepared by a process represented by the following equation:

2 1 1 1 iii ii N x) u c u 3 wherein Y is SH, OH or N0 X is chloro or bromo; and R, R and R are as previously defined.

When Y is hydroxy or mercapto the following synthe- 7 8 sis represents a mode of preparations of the desired wherein 6 COmPO d and X are as previously defined.

R O R O I u n 9 3 II N-C-N +RN C Z) N-C-N on o -'c mm R 0 Z R Z 2 I ll u IR III N-C,-N N-C x, N-.C...

\R3 R 'o/ v R3 R ONa wherein R, R R R, R Z and X are as previously The above reactions are represented equations as to defined. modes of preparation of the desired compounds. Other When Y is nitro the following synthesis represents a 25 modes are available and are listed in the literature and mode of preparation of the desired compounds: the following examples.

R Z R' z l l 2 H v N C (4) 3 2 3 N02 NH2 R Z z l I 12 I l -c- 1-RX N-C-Ik. (5) v 3 NH a x NH ,Ln (R 4 z Z R Z 6 I /R2 xyzz "I N N u c 1-1 R @N c \R3 NH 7 1? c 2 3 L1; l2 E4 r 5 R Z' 2 RI 2! (7) 1 II R R 3 ll i g i C N N C X9 N 15 NH n c N u R The starting nitroanilines or hydroxyanilines are commercially available or are easily prepared by known methods. I

Hydrogenation of the nitro group may be by any of the procedures known to those skilled in the art, such catalytic hydrogenation; metal-acid combinations such as iron-acid; metalalcohol combinations such as zinc dust or aluminum amalgams and aqueous alcohol; lithium aluminum hydride and the like.

The procedure used may depend upon the groups already present on the ring. These procedures are also well known to those skilled in the art. A preferred procedure is catalytic hydrogenation utilizing palladium on charcoal.

1n the above reaction sequences it is not required that the urea group be formed first. The second group may be formed first followed by hydrogenation of a nitro group and formation of the urea group. The actual method used depends upon convenience and nature of group to be formed. This will be illustrated in the examples showing the preparation of some of the starting compounds from which the urea function is then formed as illustrated in the equations.

The above reaction equation shows the interrelationship of the three groups of compounds. The reactions, starting compounds, intermediates and/or reactants to form each group are common to the groups.

It will be shown hereinafter that this interrelationship of the groups also extends to their herbicidal activity.

The following examples will illustrate the invention. 1n the following examples as well as in the specification and appended claims. parts and percent are by weight unless otherwise indicated.

EXAMPLE 1 This example describes the preparation of 3-(3'- hydroxyphenyl)- l ,ldimethylurea.

To a suitable vessel charged with 343.5 parts mamino-phenol in 1800 parts ethyl acetate was added 187 parts dimethylcarbamoyl chloride and the resultant mixture stirred at room temperature for hours. To this mixture was then added 177 parts triethylamine and the mixture stirred for 6 hours. Dimethylcarbamoyl chloride (187 parts) was then added and the resultant mixture stirred 72 hours at room temperature. The solid which separated was filtered and washed with ethyl acetate and then water and then air dried. mp l99.5201C.

EXAMPLE 2 This example describes the preparation of 1,1- dimethyl-3-[3'-(N-alpha-methylbenzylcarbamoyloxy)- phenyl] urea.

To a suitable vessel charged with 44.4 parts tetrahydrofuran, 23.6 parts dimethylformamide and 1.45 parts triethylamine was added, with stirring, 18 parts 1,1- dimethyl-3-(3-hydroxyphenyl)urea. To the resultant mixture was added, with stirring, 16.2 parts alphamethylbenzyl isocyanate. The solution was stirred at about 35C for 2 hours and then left standing at room temperature for about 15 hours. A solution of ethyl ether-hexane (128.5 parts ethyl ether and 79.1 parts n-hexane) was added to the mixture, with stirring, and then filtered and the crystals washed with ethyl ether and dried. mp l67-l68C Analysis for C H N o z Calcd: C. 66.06; H, 6.47; N, 12.84

Found: C, 66.24; H. 6.36; N, 12.67

EXAMPLE 3 This example describes the preparation of 1,l-dimethyl-3-[3'-(n-alpha t-butyl-4-methoxybenzylcarbamoyloxy) phenyl] urea.

This example follows the procedure of Example 2 substituting 24.01 parts of alpha t-butyl-4 methoxybenzyl isocyanate for the alpha methylbenzyl isocyanate. The product, recrystallized from methanolwater, melted 215-217C.

Analysis for C H N O Calc'd: C, 66.14; H, 7.32; N, 10.52.

Found: C. 66.21: H. 7.32; N, 10.63.

EXAMPLE 4 This example describes the preparation of l-(2- chloroallyl)- 1 -dodecyl-3-[ 3 '-(N-methylcarbamoyloxy)phenyl] urea.

To a suitable vessel charged with 245 parts m-hydroxyphenylisothiocyanate and 450 parts ethyl acetate was added, with stirring, 3.6 parts triethylamine and then, over about a 1/2 hour period, 114 parts methyl isocyanate. The reaction temperature increased to about 60C. The resultant mixture was stirred for about 30 minutes, cooled and 330 parts n-hexane added during which time crystals separated from solution. To the mixture was then added 390 parts of a solution, containing 225 parts ethyl acetate and parts n-hexane, and the mixture cooled to 5C. The mixture was filtered and the crystals, m-(N-methylcarbamoyloxy)phenylisocyanate washed with an ethyl acetate-n-hexane (2:3 volivol) solution. mp 98-99C To a suitable vessel charged with 4.2 parts m-(N- methylcarbamoyloxy)phenylisocyanate was added 5.3 parts N-(2-chloroally)dodecylamine in 16 parts methanol. The resultant mixture was heated to about 60C and then water added until the mixture turned cloudy. The resultant mixture was then allowed to stand, overnight, at room temperature. The ether was then removed yielding the product, mp l12-l 13C.

Analysis for CQ4H3CIN3O2SI Calcd: N. 8.98; S, 6.85

Found: N. 9.18; S. 6.95

EXAMPLES This example describes the preparation of 1,1- dimethyl-3-[3-(3-(2-phenoxyethyl)ureido)pheny1] urea of the formula H o 1 a N c N(CH3)2 H O H To a suitable vessel charged with 1792 parts 1,1- dimethyl-3-(m-aminophenyl)urea, 23.6 parts dimethylformamide, 44.4 parts tetrahydrofuran and .363 parts triethylamine was added, with stirring, 16.32 parts 2- phenoxyethylisocyanate (prepared from 2 5 phenoxyethylamine and phosgene). and the resultant mixture stirred for about 2 hours. Ethyl ether, 286 parts, was then added during which time a precipitate started to form. The mixture was allowed to stand over night, then filtered and the solid washed with ethyl other and air dried. mp l33l36C Analysis for c,.,H N.o.,; Calc'd: c. 63.14; H. 6.48; N. 16.36.

Found: C. 63.31; H. 6.70; N. 16.31.

EXAMPLE 6 This example describes the preparation of 1,1- dimethyl-3-[3-(3"-(alpha, 4-dimethyl-benzyl)ureido) phenyl] urea of the formula 1 11 N C N(CH l 11 t. 1 3 H O H CH This example is similar to Example 5, substituting 16.12 parts alpha,4-dimethylbenzylisocyanate for the Z-phenoxyethylisocyanate, yielding the product melt ing 203205C.

Analysis 1 for c,,H .N,o.; CLllC dI C. 67.03; H. 7.11; N. 16.46.

Found: C. 67.25; H. 7.19; N. 16.49.

EXAMPLE 7 This example describes the preparation of 3-[3-(N'- alpha-methyl-4-methylbenzyl-N- methylcarbamoyloxy )phenyl ]-1 1 -dimethylurea.

To a suitable vessel charged with parts sodium 50 methoxide and 633 parts methanol was added, with stirring, a solution consisting of 180 parts 1,1-dimethyl- 3-(m-hydroxyphenyl) urea and 802 parts methanol. The resultant mixture was stirred and the methanol removed under reduced pressure until a dry solid was obtained. The solid, sodium salt of 1,1-dimethyl-3-(mhydroxyphenyl) urea, was washed with benzene.

To a suitable vessel charged with 17.4 parts sodium salt of 1,l-dimethyl-3-(m-hydroxyphenyl) urea (prepared above) and 57.95 parts acetonitrile was added with stirring 12.7 parts N-methyl-N-alpha-methyl-4- methylbenzylcarbamoyl chloride and the mixture stirred about 2 hours at room temperature and then let stand for about 2 days at room temperature. The solvent was then removed under reduced pressure and the 6 residue dissolved in toluene. The toluene solution was extracted with water, dried and concentrated. The re sultant oil was taken up in xylene from which the product. as a solid was obtained, mp 1 l3116C.

Found: C. 67.74; H. 7.16. N. 11.72.

EXAMPLE 8 This example describes the preparation of methyl maminocarbanilate.

To a suitable vessel charged with 500 parts 111- nitroaniline, 315 parts potassium carbamate, 800 parts water, 800 parts ice and 901 parts ethyl acetate was added, with stirring, 380 parts methyl chloroformatc over about a 2 hour period, white maintaining the reaction temperature at below about 15C. Hexane (330 parts) was then added and the resultant mixture stirred about 2 hours at 25 to 30C. The mixture was then filtered and the solid washed with a 1:1 mixture of nhexane-ethyl acetate, then with water and dried. The product methyl m-nitrocarbanilate-melted at 148l50C.

To a suitable hydrogenation apparatus was charged 664 parts methyl m-nitrocarbanilate, 9 parts palladium on carbon and 1241 parts dioxane. The apparatus was then purged and pressurized to 800 psi with hydrogen. On agitation, the temperature rose slowly to about C and then dropped and the pressure dropped to 0 psi. The temperature was about 50C when the pressure was 0 psi. The apparatus was repressurized to 500 psi and the temperature rose to C. Process was repeated until no pressure drop or temperature rise was noted. The mixture was agitated in the system for an additional hour, and then the apparatus vented and the mixture filtered. The solvent was removed under re duced pressure until a pot temperature of 80C/ 0.2 mm pressure was obtained. The oil which was obtained crystallized on standingmp 67-69C. Recrystallization from methanol and then ethyl acetate-toluenemethylcyclohexane yielded the product melting 7l7l.5C.

EXAMPLE 9 This example describes the preparation of methyl m- (3-t-butylureido)carbanilate of the formula 11 o H CH N-C-N-C-CH3 N-C-O-CH A suitable vessel was charged with 16.6 parts methyl m-aminocarbanilate, prepared in Example 8, 88.8 parts tetrahydrofuran, 14.9 parts t-butylisocyanate and 0.73 parts triethylamine and the resultant mixture refluxed for about 8 hours. To the hot mixture was added 132 parts n-hexane and the mixture allowed to cool overnight. The solvent was removed under reduced pressure and the solid residue stirred with 300 parts of a 4% hydrochloric acid solution. The mixture was filtered and the solid washed with water. The solid product was recrystallized from methanol. mp l45147C EXAMPLE 10 This example describes the preparation of methyl 1n- [3-(1,l,3,3-tetramethylbutyl)urcido] carhanilatc ol'thc formula 17 3-[3-(N-ethyl-N-l-naphthylmethylcarbamoyloxy)- phenyl]-l,1-dimethylurea 3-{3-(N-methyl-N-2-fluorobenzylcarbamoyloxy)- phenyl]-l l -dimethylurea 3-[3-(N-methyl-N'-alpha-methylene-2,4,6-

trimethylbenzylcarbamoyloxy )phenyl 1 l dimethylurea 3-[3-(N'-2,2,3-trichloroallyl-N- benzylcarbamoyloxy )-phenyl ]-1 .l-dimethylurea 3-[3-(N4-bromoalphamethylbenzylcarbamoyloxy)phenyl]-l,1- dimethylurea 3-[3"(N-alpha-tert.butyl-4- methoxybenzylcarbamoyloxy )-phenyl ]-l l dimethylurea 3[3'-(N'-2-(4-chloro-2- methylphenoxy )ethylcarbamoyloxy)-phenyl]-l ,ldimethylurea 3-[3'-(N-5-(2- chlorophenoxy)pentylcarbamoyloxy)phenyl]-1,1- dimethylurea 3-[3'-(N'-2-(4chloro-2,5-

xylyloxy)ethylcarbamoyloxy)-phenyl]-l,1- dimethylurea 3-[3'-(N'-2-(4-chloro-3,5-

xylyloxy)ethylcarbamoyloxy)-phenyl]-1,ldimethylurea 3-[3'-(N'-2,2-dimethyl-3- phenylpropylcarbamoyloxy)-phenyl l ,l dimethylurea 3-[3"(N'-alpha-methyl-3- methoxybenzylcarbamoyloxy)-phenyl]-l l dimethylurea 3-{3-(N-alpha-methyl-3,4-

dichlorobenzylcarbamoyloxy )-phenyl ]-l .1- dimethylurea 3-[3-(N'-alhpa,2,4-trimethylbenzylcarbamoyloxy)- phenyl]-1,1-dimethylurea The following urea-carbanilates were also prepared by substantially the same procedure as previously shown. Sulfur analogs of the carbanilate group will be represented as follows:

- N C R carbanilic acid thiolcu'banilic acid 0R thionocarpanilic acid SR dithiocarbanilic acid The nitrogen of the urea group attached to the metabifunctional phenyl ring will be the 3 nitrogen and the other nitrogen the 1 nitrogen.

methyl ester m-[3-(l-t-butyl)-2-thioureido]thiolcarbanilic acid methyl ester m-[3-(l-(4-phenoxy)phenyl)-2-thioureido]carbanilic acid methyl ester m-[3-(1-3-methylthio)phenyl)ureido] carbanilic acid phenyl ester m-[3-(1-(3'-methylthio)phcnyl- )ureido1-carbanilic acid isopropyl ester m-[3-(l-(3'-methylthio)phcnyl- )ureidol-carbanilic acid methyl ester m-[3-(l-(3-triilu0romcthyl)phcnyl- )ureidol-carbanilic acid isopropyl ester m-[ 3-( l-(3'-trifluoromethyl )phenyl ureidolcarbanilic acid phenyl ester m-[3-( l-(3'-trifluoromethyl)phenyl- )ureido]-carbanilic acid methyl ester m-[3-(l-(3-methylthio)phcnyl)thi- 0ureid0]-carbanilic acid methyl ester m-[3-(1-(3'-trifluoromethyl)phenyl)thioureido]carbanilic acid phenyl ester m-[3-(l-(3'-trifluoromethyl)phenyl)- thioureido]carbanilic acid phenyl ester m-[3-(l-(3'-methylthio)phenyl)thioureido]-carbanilic acid phenyl ester m-[ 3'-( l-(3-fluoro)phenyl)thioureidol-carbanilic acid methyl ester m-[3-(l,1-dimethyl)urdeid0]-thiolcarbanilic acid isopropyl ester m-[3-(l-allyl)thioureidolcarbanilic acid m-[ 3-( l-phenyl)thioureido]carisopropyl ester banilic acid ethyl ester m [3-(l,l-dimethyl)ureido]thiolcarbanilic acid ethyl ester m-[3-(l,l-piperidyl)ureidolthiolcarbanilic acid methyl ester m-[3-(l-t-butyl)thioureidoIcarbanilic acid methyl ester m-[3-(l,l-piperidyl)thioureidolcarbanilic acid methyl ester m-[3-(1,l-di-isopropyl)thioureido1carbanilic acid methyl ester m-[3-( l ,1-diethyl)thioureido]carbanilic acid methyl ester m-[3-(l,l-diallyl)thioureido1carbanilic acid isopropyl ester m-[3-(l-t-butyl)thioureid01carbanilic acid methyl ester m-[3-(1-t-butyl)ureido]carbanilic acid methyl ester m-[3-( l-methyl)urediolcarbanilic acid The following di-urea compounds were prepared by substantially the same procedure as previously shown.

l'-methyl-3-[ 3'-( l-( 3,4"-dichloro)phenyl )ureidol phenylthiourea l-ethyl-3-[3-( l-( 3",4"-dichloro)phenyl )thiouredio]phenylthiourea l,1-dimethyl-3-[3'-(1-(2-chloroallyl)thioureido]- phenylurea l,l-dimethyl-3-[3'-(l-(3", 4"-dichloro)phenyl)thiourea]phenylurea 1,1-dimethyl-3-[3-(1-allyl)thioureido]phenylurea 1-t-butyl-3-[3 l ,1-dimethyl)ureido]phenylthiourea l-(2-chloroallyl)-l-methyl 3-[3-(1,1-dimethyl- )ureido]phenylthiourea l,l-dimethyl-3-[3'-( l-(2-phenoxy)ethyl)ureido]- phenylurea 1,1-dimethyl-3-[3'-(l-(2-0-chlorophenoxy)ethyl- )ureido]phenylurea In accordance with this invention it has been found that the growth of dormant seeds, germinant seeds, germinative seeds, emerging seedlings and established woody and herbaceous vegetation can be modified by expos- A good grade of top soil is placed in aluminum pans and compacted to a depth of to /2 inch from the top of each pan. A predetermined number of seeds of each of various plant species are placed on top of the soil in m h d emerging seedlings, or the mots or 5 each pan. The herbicidal compositions are applied to above-ground portions of established vegetation, to the l y mixture with or incorporation in the to action of an effective amount of the compounds of the soil layer. present invention. The compounds can be used as indiin e Surface application method the seeds are covvidual compounds, as admixtures of two or more comered Wlth a 3/8 h ty of P p $011 and the P pounds, or in admixture with an adjuvant. These comh- The herblcldal composltloh PP by pounds are effective as post-emergent herbicides and sprfiymg the Ofthe layer h i Prlor t0 pre emergem herbicides, but their most Outstanding termg the seeds, with a solution containing a sufficient ili i as Selective pre emergem d post emergem amount of active ingredient to obtain the desired rate activity, eg the selective control of the growth of one per acre h t surface ("more monocotyledonous Species and/Or one or more 15 In the soil incorporation method, the soil required to dioctyledonous species in the presence of other monoeever the e he and admlxed wlth t"- cotyledons and/or dicotyledons. Furthermore, these eemposlheh eohtammga tthowhhmouht of act! compounds are characterized by broad spectrum activmgred'eht- The h e thehhhed with the afhhlxture ity; Le. they modify the growth of a wide variety and leveled. Watering is carried out by permitting the plants soil in the pans to absorb moisture through the aper- For the sake of brevity and simplicity, the term achiredfottom of B pans The Cqntammg pans h tive ingredient" will be used hereinafter to describe the p ace on a San bench and m 'h fe approx" present 3l (carbamoyloxy)ureas; ureidoureas and mately 14 or 28 days under ordinary conditions of sunureacarbanilates light and watering. The plants are observed at the end The herbicidal compositions of this invention contain of gpgroxlmately 14 or 28 days and the results at least one active ingredient and an adjuvant in liquid cor e I or solid form The compositions are prepared by The pre emergent herbicidal activity of the active in mixing the active ingredient with an adjuvant including f e j fi by the average Pereeht Control of diluents, extenders, carriers and conditioning agents to eac see e everage percent control eehverted provide compositions in the form of finely-divided par- 30 9 a e h e hughencal selale %L of hrevlty h ticulate solids, granules, pellets, solutions, dispersions gg h a 'e f g 2 or emulsions. Thus the active ingredient can be used w y m ex use m e 3 e515 e as 0 with an adjuvant such as a finely-divided solid, a liquid w or organic origin, water, a wetting agent, a dispersing Avmge percent Numerical agent, an emulsifying agent or any suitable combina- Control Scale tion of these. 0 25 0 The term herbicidal composition" as used herein 26 s0 I and in the appended claims is intended to mean not 3g :3 f a only compositions in a suitable form for application but 40 T also concentrated compositions which require dilution extension with a i l q y 0f hquld 0T Sohd The pre-emergent herbicidal activity of some of the adluvaht P to apphcahoht 3'-(carbamoylo xy)ureas of this invention is recorded in The pre-emergent herbicidal activity of illu i Table I for various application rates ofthe active ingrecompounds of this invention is demonstrated as folclients. The data recorded in Table l is observation after lows; 14 days unless otherwise indicated.

TABLE I PRE-EMERGENT HERBICIDAL ACTIVITY (D W U m U it 3 3 3 E 3 3 3 u 35"; 36.02.3333 3 '8 g H a 3 u '5 m J: U 2! M U E N U U .n g q, I M 5 O a a U z 5 Q g H 5 at o u in u 0 i3 0 m r: o m E a B 5 U U B H Q g 11 1 '0 H g X n he.ggag fiiilfig afi fifigfifi fi g C p d l la r wpi u fifi'sq 330E333Em 1 1 2oo0o13oo132oooo-'------ n 1 --az1-3-o2-o112o- III 1 30-00-3032: o13-o-- -1o 1v 5 -------213-1-1o-12oo'1-- v 1 3-1-oo-a12a3-o22-a---1o v1 2 2oo1o111111o1o12------- v11 1 12000032031000oo------- v11: 2 32oooo3oqa121o12------- Compound I 3(3- (N'alpha methylbenzylcarbamoyloxy) phenyll 1,1dirn'ethy1urea II 3- [3 (N 'alpha-npropylbenzylcarbamoyloxy)phenyl]-1,1dimethylurea III 3- [3 (N'(1,l-ziimethyl-Z-phenylethylcarbamoyloxy) phenyl] -1 ,l-dimethy1urea IV 3- [3 (N'methylcarbamoyloxy) phenyl] -lallylthiourea V 3- [3 (N -alpha methyl-4chlorobenzylcarhamoyloxy) phenyl] 1. ,1-dimcthylutea VI ethyl N- [3-(1, 1-dimethyl) ureido] thiolcarbanilate VII phenyl N- [3- (1-m-trifluoromethyl) ureido] carbanilate VIII 1-t-buty1-3- [3 '(1,l-dimethy1) ureidolphenylthiourea 21 22 Although the Compounds Of th s in ent P0 6 observations on 21 day old specimen unless otherwise pre-emergent activity, they are more active as postindi t d, emergent herbicides This IS illustrated by the fOllOW- The post-emergent herbicidal activity index uscd in ing: Tables II, III and IV is measured by the average percent The active ingredients a applied in spr y form I0 5 control of each plant species and is defined as follows:

14-day or 21 day old plants species. The spray, an organic solventwater solution containing the active inif gg m gredient, is applied to the plants in different set of pans at defined rates per acre. The treated plants are placed 2 g3 1 in a greenhouse and the effects observed and recorded 0 51 I 75 2 after approximately 14 days or approximately 28 days. 7616099 3 The data recorded in Tables II, Ill and IV is for 14 day TABLE II POST-EMERGENT HERBIC IDAL DATA-CARBAMOYLOXY-UREAS 0 U U "I '3 Z n '3 3 3 (I H O Q) 'lll W H m H e a a: a a a a s e g g 3 m U Z H H U n U a U U G U H U Q U G 3 3 O 4 'd H U '4 n O X "I a x .3 E g I S E 5 5 5 8 o o g o :1 o u m Compounds Com: 0 o 5: a m 1 0 n m a:

II 0.2 0 3 2 3 4 4 0 l 1 1 2 III 0.2 1 3 1 2 3 2 o 1 0 1 2 IV 0.2 (a) 4 4- 4 4 4 o 1 1 2 V 0.2 (a) 4 3 4 4 4 l 2 0 1 2 (a) active ingredient applied to 14 day-oldp1ant specimen 1, 1-dimethy1-3-[3 (N -met:hy1-N -2m-ch lorophenoxyethylcarbamoyloxy) phenyl] urea Compound I Compound II 1,1-dimethy1-3-[3'-(Nl,l-dimethyl-Z-phenylcarbamoy1oxy)phenyl] urea Compound III 1,1-dimethyl-3-[3'(N'methy1N-2-(2-methyl-4-ch1orophenyl)ethylcarbamoyloxy)phcnyll urea Compound IV l,1-d1methy1-3-[3'-(N-4-methylbenzylcarbamoyloxy)phenyl] urea Compound V 1,1-dimethyl-3-[3'-(N'-a1pha isopropylbenzylcarbamoyloxy)phenyl] urea TABLE III POST-EMERGENT HERBICIDAL ACTIVITY-UREA-CARBANILATES u: n u a: g a i a {J o I, a :1 I, a x: w s g m o m .3 u u u as 5 'o o .o :1 u m o u u a g o 0 ii 5 2i 3 s o g g 0 e s-s3e7sfi Compound Com: m u m u 1% Q m w 0 A :x: I; m m u II 0.2 3 O 1 1 O 0 4 4 0 4 4 2 1 l 2 III 0.2 4 1 3 1 0 0 4 4 1 3 4 2 1 2 3 2 Compound I methyl N-[3-(1-t-buty1ureido)phenyllthiolcarbanilate Compound II methyl N-[3-(1-(4-phenoxy)phenylthioureido)phenyllcarbanilate Compound III methyl N-[3-(l-t-butylthioureido)phenyl] carbanilate TABLE IV POST-EMERGENT HERBICIDAL ACTIVITY-DI-UREAS u .2 u u a u 3 5 n u 6 m g '3 3 1! E '1: I3 5 'o .5 g o u u a u a o B o m u o u u 3 o u o A u m at 1 sueessawwsg zsssa o o o 8 a w E o 5 o w u m 1. Compound Com: m u m a w u a a: a m a: o

II 0.05 (a) 3 1 1 1 2 3 4 2 1 3 3 1 1 2 2 2 III 0.05 4 2 1 1 l 2 4 4 4 4 4 2 1 1 2 3 1v 0.01 4 2 1 o o o 4 3 o 4 4 1 o 1 p 1 Compound I 1,1-dimethy1-3-[3'-(1(2-ch1o:oa11y1)thioureido)pheny1] urea 1,1-dimethy1-3- [3 (l (3, 4-dichlorophenyl) thioureido)pheny1) urea l-t-butyl-B- [3 (1, 1-dimethylureido) phenyl] urea l-methyl-l-(2-ch1oroal1yl)-3-[3'(l,ldimethylureido)phenyl] thiourea Compound II Compound III Compound IV In addition to the general herbicidal activity of the compounds of this invention, they also exhibit selective activity on weeds in the presence of crops.

As mentioned hereinbefore the herbicidal compositions of this invention comprise an active ingredient and one or more adjuvants which can be solid or liquid extenders, carriers, diluents, conditioning agents and the like. Preferred herbicidal compositions containing the active ingredients of this invention have been developed so that the active ingredients can be used to the greatest advantage to modify the growth of plants. The preferred compositions comprise wettable powders, aqueous suspensions, dust formulations, granules, emulsifiable oils and solutions in solvents. In general, these preferred compositions can all contain one or more surface-active agents.

Surfaceactive agents which can be used in the phytotoxic compositions of this invention are set out, for example, in Searle U.S. Pat. No. 2,426,417, Todd U.S. Pat. No. 2,655,447, Jones U.S. Pat. No. 2,412,510 and Lenher U.S. Pat. No. 2,139,276. A detailed list of such agents is also set forth by J. W. McCutcheon in Soap and Chemical Specialties," November 1947, page 801 1 et seq.. entitled Synthetic Detergents: Detergents and Emulsifiers-Up to Date" (1960), by J. W. McCutcheon, Inc., and Bulletin E-607 of the Bureau of Entomology and Plant Quarantine of the USDA. In general, less than 50 parts by weight of the surface active agent is present per 100 parts by weight of the herbicidal composition.

Wettable powders are water-dispersible compositions containing one or more active ingredients, an inert solid extender and one or more wetting and dispersing agents. The inert solid extenders are usually of mineral origin such as the natural clays, diatomaceous earth and synthetic minerals derived from silica and the like. Examples of such extenders include kaolinites, attapulgite clay and synthetic magnesium silicate.

Preferred wetting agents are alkyl benzene and alkyl naphthalene sulfonates, sulfated fatty alcohols, amines or acid amides, long chain acid esters of sodium isothionate, esters of sodium sulfosuccinate, sulfated or sulfonated fatty acid esters, petroleum sulfonates, sulfonated vegetable oils, ditertiary acetylinic glycols, polyoxyethylene derivatives of alkylphenols (particularly isooctylphenol and nonylphenol) and polyoxyethylene derivatives of the mono-higher fatty acid esters of hexitol anhydrides (e.g. sorbitan). Preferred dispersants are methyl cellulose, polyvinyl alcohol, sodium lignin sulfonates, polymeric alkyl naphthalene sulfonates, sodium naphthalene sulfonate, polymethylene bisnaphthalenesulfonate and sodium N-methyl-N-(long chain acid) taurates.

The wettable powders compositions of this invention usually contain from about 5 to about 95 parts by weight of active ingredient, from about 0.25 to 25 parts by weight of wetting agent, from about 0.25 to 25 parts by weight of dispersant and from 4.5 to about 94.5 parts by weight of inert solid extender, all parts being by weight of the total composition. Where required from about 0.1 to 2.0 parts by weight of the solid inert extender can be replaced by a corrosion inhibitor or antifoaming agent or both.

Aqueous suspensions can be prepared by mixing together and grinding an aqueous slurry of water-.

insoluble active ingredient in the presence of-dispersing agents to obtain a concentrated slurry of very finelydivided particles. The resulting concentrated aqueous suspension is characterized by its extremely small particle size, so that when diluted and sprayed coverage is very uniform.

Dusts are dense finely-divided particulate compositions which are intended for application to the soil in dry form. Dusts are characterized by their free-flowing and rapid settling properties so that they are not readily wind-borne to areas where they are of no value. Dusts contain primarily an active ingredient and a dense, free-flowing finely-divided particulate extender. However, their performance is sometimes aided by the inclusion of a wetting agent such as those listed hereinbefore under wettable powder compositions and convenience in manufacture frequently demands the inclusion of an inert, absorptive grinding aid. Suitable classes of grinding aids are natural clays, diatomaceous earth and synthetic minerals derived from silica or silicate. Preferred grinding aids include attapulgite clay. diatomaceous silica, synthetic fine silica and synthetic, calcium and magnesium silicates.

The inert finely-divided solid extender for the dusts can be either of vegetable or mineral origin. The solid extenders are characterized by possessing relatively low surface areas and are poor in liquid absorption. Suitable inert solid extenders for plant growth regulant dusts include micaceous talcs, pyrophyllite, dense kaolin clays, ground calcium phosphate rock and tobacco dust. The dusts usually contain from about 0.5 to parts active ingredient, 0 to 50 parts grinding aid, 0 to 50 parts wetting agent and 5 to 99.5 parts dense solid extender, all parts being by weight and based on the total weight of the dust.

The wettable powders described above may also be used in the preparation of dusts. While such wettable powders could be used directly in dust form, it is more advantageous to dilute them by blending with the dense dust diluent. In this manner, dispersing agents, corrosion inhibitors, and anti foam agents may also be bound as components of a dust.

Emulsifiable oils are usually solutions of active ingredient in water-immiscible or partially water-immiscible solvents together with a surface active agent. Suitable solvents for the active ingredient of this invention in clude hydrocarbons and water-immiscible ethers, esters or ketones. Suitable surface active agents are anionic, cationic and non-ionic such as alkyl aryl polyethoxy alcohols, polyethylene sorbitol or sorbitan fatty acid esters, polyethylene glycol fatty esters, fatty alkyllol amide condensates, amine salts of fatty alcohol sulfates together with long chain alcohols and oil soluble petroleum sulfonates or mixtures thereof. The emulsifi able oil compositions generally contain from about 5 to 95 parts active ingredient, about 1 to 50 parts surface active agent and about 4 to 94 parts solvent, all parts being by weight based on the total weight of emulsifiable oil.

Granules are physically stable particulate compositions comprising active ingredient adhering to or distributed through a basic matrix of an inert, finelydivided particulate extender. In order to aid leaching of.

the active ingredient from the particulate, a surface active agent such as those listed hereinbefore under wettable powders can be present in the composition. Natural clays, pyrophyllites, illite and vermiculite are exam ples of operable classes of particulate mineral extenders. The preferred extenders are the porous, absorptive, preformed particles such as preformed and screened particulate attapulgite or heat expanded, particulate vermiculite, and the finely-divided clays such as kaolin clays, hydrated attapulgite or bentonitic clays. These extenders are sprayed or blended with the active ingredient to form the herbicidal granules.

The mineral particles which are used in the granular herbicidal compositions of this invention usually have a size range of 10 to 100 mesh, but preferably such that a large majority of the particles have from 14 to 60 mesh with the optimum size being from 20 to 40 mesh. Clay having substantially all particles between 14 and 80 mesh and at least about 80 percent between 20 and 40 mesh is particularly preferred for use in the present granular composition. The term mesh" as used herein means U.S. Sieve Series.

The granular herbicidal compositions of this invention generally contain from about 5 parts to about 30 parts by weight of active ingredient per 100 parts by weight of clay and to about parts by weight of surface active agent per 100 parts by weight of particulate clay. The preferred herbicidal granular compositions contain from about parts to about parts by weight of active ingredient per 100 parts by weight of clay.

The herbicidal compositions of this invention can also contain other additaments, for example fertilizers, phytotoxicants, other plant growth regulants, pesticides and the like used as adjuvant or in combination with any of the above-described adjuvants. Chemicals useful in combination with the active ingredients of this invention include for example triazines, ureas, carbamates, acetamides, acetanilides, uracils, acetic acids, phenols, thiolcarbamates, triazoles, benzoic acids, nitriles and the like such as:

3-amino2,5dichlorobenzoic acid 3-amino-l ,2,4-triazole 2-methoxy-4-ethylamino-6-isopropylamino-s-triazine 2-chloro-4-ethylamino-6-isopropylamino-s-triazine 2-chloro-N,N-diallylacetamide 2-chloroallyl diethyldithiocarbamate N-(4-chlorophenoxy) phenyl-N,N-dimethylurea isopropyl M-(3-chlorophenyl)carbamate 2,2-dichloropropionic acid S-2,3-dichloroallyl N,N-diisopropylthiolcarbamate 2-methoxy3,6-dichlorobenzoic acid 2,6-dichlorobenzonitrile 6,7-dihydrodipyrido( I,2-a:2,1'-c)-pyrazidiinium salt 3-( 3 ,4-dichlorophenyl)-l l -dimethylurea 4,6-dinitro-o-sec-butylphenol 2-methyl-4,6-dinitrophenol ethyl, N,N-dipropylthiolcarbamate 2,3,6-trichlorophenylacetic acid 3-(3,4-dichlorophenyl)-1-methoxy-I-methylurea 2-methyl-4-chlorophenoxyacetic acid 3(p-chlorophenyl)-l ,l-dimethylurea l-butyl-3-(3,4-dichlorophenyl)-l-methylurea N-l-naphthylphthalamic acid l,1-dimethyl-4,4-bipyridinium salt 2-chloro-4,6-bis(isopropylamino)-s-triazine 2-chloro-4,6-bis(ethylamino)-s-triazine 2,4-dichlorophenyl-4-nitrophenyl ether alpha,alpha,alpha-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine S-propyl dipropylthiolcarbamate 2,4-dichlorophenoxyacetic acid 2,6"diethyl-N-methoxymethyl-2-chloroacetanilide Fertilizers useful in combination with the active in gredients include for example ammonium nitrate, urea, potash, and superphosphate. Other useful additaments include materials in which plant organisms take root and grow such as compost, manure, humus, sand and the like.

When operating in accordance with the present invention, effective amounts of the active ingredient are dispersed in or on soil or plant growth media and/or applied to aboveground portions of plants, in any convenient fashion. Application to the soil or growth media can be carried out by simply admixing with the soil, by applying to the surface of the soil and thereafter dragging or discing into the soil to the desired depth, or by employing a liquid carrier to accomplish the penetration and impregnation. The application of liquid and particulate solid herbicidal compositions to the surface of soil or to above-ground portions of plants can be carried out by conventional methods, e.g. power dusters, boom and hand sprayers and spray dusters. The compositions can also be applied from airplanes as a dust or a spray because of their effectiveness at low dosages. In a further method, the distribution of the active ingredients in soil can be carried out by admixture with the water employed to irrigate the soil. In such procedures. the amount of water can be varied with the porosity and water holding capacity of the soil to obtain the de sired depth of distribution of the herbicide.

The application of an effective amount of the compounds of this invention to the soil or growth media and/or plant is essential and critical for the practice of one embodiment of the present invention. The exact amount of active ingredient to be employed is dependent upon the response desired in the plant as well as such other factors as the plant species and stage of development thereof, the specific soil and depth at which the active ingredients are distributed in the soil and the amount of rainfall as well as the specific active ingredient employed. In foliar treatment for the modification of vegetative growth, the active ingredients are applied in amounts from about 0.001 to about 25 or more pounds per acre. In applications to soil for the modification of the growth of germinant seeds, germinative seeds, emerging seedlings and established vegetation, the active ingredients are applied in amounts from about 0.1 to about 50 or more pounds per acre. In such soil applications, it is desirable that the active ingredients be distributed to a depth of at least 0.2 inches. In selective pre-emergence herbicidal applications the active ingredients are usually applied in amounts from about 0.1 to 5 pounds per acre. It is believed that one skilled in the art can readily determine from the teachings of this specification, including examples, the approximate application rate for any situation.

The terms soil and growth media" are employed in the present specification and claims in their broadest sense to be inclusive of all conventional s0ils" as defined in Websters New International Dictionary, Second Edition, Unabridged (l961). Thus, the terms refer to any substance or media in which vegetation may take root and grow, and are intended to include not only earth but also compost, manure, muck, humus, sand and the like, adapted to support plant growth.

Although the invention-is described with respect to specific modifications, the details thereof are not to be construed as limitations except to the extend indicated in the following claims.

What is claimed is: 1. Meta-bifunctional substituted benzenes of the formula 1 &2 3

N-C-N 3 9 O-C-N/ wherein R is hydrogen or alkyl having a maximum of 4 carbon atoms, R is selected from the group consisting of CH CH O-phenyl,Cl-l CH O-naphthyl, -,CH Cl-l=Cl-l-phenyl and the group wherein R and R are each independently selected from the group consisting of hydrogen, alkyl having a maximum of 4 carbon atoms, alkenyl having a maximum of 3 carbon atoms, chloroalkyl having a maximum of 3 carbon atoms and a maximum of 3 halogen atoms, chloroalkenyl having a maximum of 3 carbon atoms and 3 halogen atoms, R is selected from the group consisting of halogen, alkyl having a maximum of 4 carbon atoms, chloroalkyl having a maximum of 3 carbon atoms and a maximum of 3 halogen atoms, nitro, and alkoxy having a maximum of 3 carbon atoms; and r is one of the integers zero to three, R is selected from the group consisting of alkyl and alkenyl each having a maximum of 4 carbon atoms and R is selected from the group consisting of hydrogen, alkyl having a maximum of 12 carbon atoms, cycloalkyl having 5 to 7 ring carbon atoms, chloroalkyl having a maximum of 6 carbon atoms and a maximum of 3 halogen atoms and chloroalkenyl having a maximum of 4 carbon atoms and a maximum of 3 halogen atoms.

2. A compound according to claim 1 which is 3-[3- (N'-alpha-methylbenzylcarbamoyloxy )phenyl1-l ,1- dimethylurea.

3. A compound according to claim 1 which is 3-[3'- (N '-alpha-ethylbenzylcarbamoyloxy)phenyl]1,1- dimethylurea.

4. A compound according to claim 1 which is 3-[3'- (N-alpha-isopropylbenzylcarbamoyloxy)phenyl]-l ,ldimethylurea.

5. A compound according to claim 1 which is 3-[3'- (N-l ,l -dimethyl-2-phenylethylcarbamoyloxy phenyl]-l,l-dimethylurea.

6. A compound according to claim 1 which is 3-[3'- (N'-methyl-N-alpha,4-dimethylbenzylcarbamoyloxy)-phenyl]-l ,l -dimethylurea.

7. A compound according to claim 1 which is 3-/3'- (N-alpha-methyl-4-methylbenzyl-N- methylcarbamoyloxy )phenyl/-l ,l-dimethylurea.

Claims

1. META-BIFUNCTIONAL SUBSTITUTED BENZENES OF THE FORMULA

2. A compound according to claim 1 which is 3-(3''-(N''-alpha-methylbenzylcarbamoyloxy)phenyl)-1,1-dimethylurea.

3. A compound according to claim 1 which is 3-(3''-(N''-alpha-ethylbenzylcarbamoyloxy)phenyl)1,1-dimethylurea.

4. A compound according to claim 1 which is 3-(3''-(N''-alpha-isopropylbenzylcarbamoyloxy)phenyl)-1,1-dimethylurea.

5. A compound according to claim 1 which is 3-(3''-(N''-1,1-dimethyl-2-phenylethylcarbamoyloxy)phenyl)-1,1-dimethylurea.

6. A compound according to claim 1 which is 3-(3''-(N''-methyl-N''-alpha,4-dimethylbenzylcarbamoyloxy)phenyl)-1,1 -dimethylurea.

7. A compound according to claim 1 which is 3-/3''-(N''-alpha-methyl-4-methylbenzyl-N-methylcarbamoyloxy)phenyl/-1,1 -dimethylurea.