GB2043629A - Pesticidal compositions comprising 1-phenyl-3-polyhaloalkylthio- or -polyhalovinyl-uracils and processes for treating plants - Google Patents

Abstract

Pesticidal compositions comprise, as active ingredients, compounds of the formula <IMAGE> wherein R is H, CH3 or C2H5; X is H, carbamoyl or cyano; y is 0, 1, 2 or 3; R<1> is polyhaloalkyl or polyhalovinyl; R<2> is lower alkyl or alkoxy, Br, Cl, F, CN, NO2, OH, lower haloalkyl, lower alkylcarbonyl, lower alkylthio, lower alkoxycarbonyl, lower haloalkoxy, cycloalkyl or cycloalkalkyl; and R<3> and R<4> are H or a value recited for R<2>. The compounds of the above formula may be obtained by reacting a 1-phenyl-uracil with a polyhaloalkyl sulphenyl halide or a polyhalovinyl sulphenyl halide in the presence of an alkali metal. These compounds and compositions are useful for combating pests in the treatment of plants.

Description

SPECIFICATION Pesticidal compositions and processes for treating plants This invention relates to pesticidal compositions containing, as an active ingredient, a 1-phenyl-3-poly- haloalkyl or -polyhalovinyl uracil and to methods of combating plants pest, especially fungi and bacteria, using them.

The invention provides a pesticidal composition comprising as an active ingredient a 1-phenyl-3polyhaloalkyl or -polyhalovinyl uracil having the following formula A:

wherein R is hydrogen, methyl or ethyl; R1 is polyhaloalkyl or polyhalovinyl; R2 is hydrogen, lower alkyl, lower alkoxy, bromo, chloro, fluoro, lower haloalkyl, cyano, nitro, lower alkylthio, hydroxy, lower alkylcarbonyl, lower alkoxycarbonyl, lower haloalkoxy, cycloalkyl, or cycloalkalkyl; R3 is hydrogen or independently selected from the values of R2; R4 is hydrogen or independently selected from the values of R2; Xis hydrogen, carbamoyl, or cyano; y is zero, one, two or three.

The term "polyhaloalkyl", as used herein, refers to polyhalomethyl and polyhaloethyl wherein the halo group is bromo, chloro orfluoro. The term "polyhaloalkyl" includes trichloromethyl; dichlorofluoromethyl; bromo-dichloromethyl; trifluoromethyl; tribromomethyl; 1,1 2,2-tetrachloroethyl; pentachloroethyl; 1,2dibromo-1,2-dichloroethyl; 1 ,2,2-trichloroethyl; 1,1 ,2-trichlornethyl; 1 ,2,2,2-tetrachloroethyl; 2-chloro-1,2,2tri-bromoethyl; 2-bromo-1 1 ,2-trichlornethyl; 2-bromo-1,2,2-trichloroethyl; 2-chloro-l ,2-dibromoethyl; and 2-fluoro-1,1 ,2,2-tetrachloroethyl. The term "polyhalovinyl", as used herein, refers to polyhalovinyl wherein the halo group is bromo, chloro, or fluoro. The term "polyhalovinyl" includes trichlorovinyl; 2-bromo-1,2dichlorovinyl; and 2-fluoro-1,2-dichlorovinyl.

The term "lower alkyl", as used herein, refers to a lower alkyl group of one to six carbon atoms. The term "lower alkoxy", as used herein, refers to a lower alkoxy group of one to six carbon atoms. The term "lower alkylthio", as used herein, refers to a lower alkylthio group of one to six carbon atoms. The term "lower haloalkyl", as used herein, refers to a lower alkyl group substituted with one to three atoms of bromine, chlorine or fluorine. The term "lower haloalkoxy", as used herein, refers to a lower alkoxy group substituted with one to three atoms of bromine, chlorine or fluorine. The term "lower alkylcarbonyl", as used herein, refers to a lower alkylcarbonyl group of two to seven carbon atoms. The term "cycloalkyl", as used herein, refers to a cycloalkyl group of three to six carbon atoms.The term "cycloalkalkyl", as used herein, refers to a cycloalkyalkyl group of four to seven carbon atoms.

Specific compounds which may be used as active ingredients in compositions and methods according to the invention are set out in Examples 1 to 9 hereinafter.

Preferred compounds are those wherein, in formula A collectively or individually, y is zero; and R3 and R4 are lower alkyl, especially methyl; and where R is hydrogen or lower alkyl, especially methyl; and where X is cyano; and R' is SCC13 or SCC12CHC12.

A particularly preferred compound has the structure:

and chemical name 5-cyano-1-(2-6,-dimethylphenyl)-3-trichlormethanesulphenyluracil. Its preparation is described hereinafter in Example 1.

The compositions of the invention display, variously, activity against the following diseases: Xanthomonas oryzae and Pyricularia oryzae and other diseases on rice caused by bacteria and fungi.

Bacterial diseases of other plants such as Xanthomonas campestris on cabbage, Xanthomonas vesicatoria on peppers and Xanthomonas malvacearum on cotton.

Fungal diseases of other plants such as Erysiphe graminis on wheat and barley and other powdery mildews on various hosts such as Sphaerotheca fuliginea (cucurbits, e.g. cucumber), Podosphaera leucotricha (apples) and Uncinula necator(vines).

Puccinia recondita, Puccinia struformis and other rusts on wheat, Puccinia hordei, Puccinia struformis and other rusts on barley, and rusts on other hosts, e.g. coffee, apples, vegetables and ornamental plants.

The compounds are also active against other diseases such as Botrytis cinerea (grey mould) on tomatoes, strawberries, vines and other hosts, and Colletotrichum coffeanum (berry disease) of coffee.

They can be used as industrial (as opposed to agricultural) bactericides and fungicides, e.g. as paint film fungicides. The compounds also have plant growth regulating properties.

By way of example the compound of Example 1 having the structure:

is strongly active against the diseases Xanthomonas oryzae and Pyricularia oryzae.

The active ingredients may be usd as such, for example for fungicidal or bactericidal purposes, but are more conveniently formulated into compositions for such usage.

The active ingredients of the invention compositions, and salts thereof, can be applied in a number of ways, for example they can be applied, formulated or unformulated, directly to the foliage of a plant, or they can be applied to bushes and trees, to seeds or to other medium in which plants, bushes or trees are growing or are to be planted, or they can be sprayed on, dusted on or applied as a cream or paste formulation, or they can be applied as a vapour. Application can be to any part of the plant, bush or tree, for example to the foliage, stems, branches or roots, or to soil or paddy water surrounding the roots, or to the seed before it is planted.

The term "plant" as used herein includes seedlings, bushes and trees. Furthermore, the fungicidal method of the invention includes preventative, protectant, prophylactic and eradicanttreatment.

In a further aspect, therefore, the present invention provides a method for combating plant pests, especially fungi and bacteria, which comprises treating plants or seeds, or their loci, with a composition according to the invention and as herein defined.

In a further aspect the invention provides a method for combating the diseases Xanthomonas oryzae and Pyricularia oryzae which comprises treating rice plants or seeds, or their locus, with the compound having the structure:

or a composition containing the same.

The active compounds may be used as such but are more conveniently formulated into compositions for use in the processes of the invention. These compositions are part of the present invention.

The compositions may be in the form of dusting powders or granules comprising the active ingredient and a solid diluent or carrier, for example, kaolin, bentonite, kiesulguhr, dolomite, calcium carbonate, talc, powdered magnesia, Fuller's earth, gypsum, Hewitt's earth, diatomaceous earth and China clay.

Compositions for dressing seed, for example, may comprise an agent (for example a mineral oil) for assisting the adhesion of the composition to the seed; alternatively the active ingredient can be formulated for seed dressing purposes using an organic solvent (for example N-methylpyrrolidone or dimethylformamide).

The compositions may also be in the form of dispersible powders, granules or grains comprising a wetting agent to facilitate their dispersion in liquids. The powers, granules or grains may also contain fillers and suspending agents.

The aqueous dispersions or emulsions may be prepared by dissolving the active ingredient(s) in an organic solvent optionally containing wetting, dispersing or emulsifying agent(s) and then adding the mixture to water which may also contain wetting, dispersing or emulsifying agent(s). Suitable organic solvents are ethylene dichloride, isopropyl alcohol, propylene glycol, diacetone alcohol, toluene, kerosene, methylnaphthalene, the xylenes, trichloroethylene, furfuryl alcohol, tetrahydrofurfuryl alcohol, and glycol ethers (e.g. 2-ethoxyethanol and 2-butoxyethanol).

The compositions to be used as sprays may also be in the form of aerosols wherein the formulation is held in a container under pressure in the presence of a propellant, e.g. fluorotrichloromethane or dichlorodifluoromethane.

The active ingredients can be mixed in the dry state with a pyrotechnic mixture to form a composition suitable for generating in enclosed spaces a smoke containing the compounds.

Alternatively, the active ingredients may be used in a microencapsulated form.

By including suitable additives, for example additives for improving the distribution, adhesive power and resistance to rain on treated surfaces, the different compositions can be better adapted for various utilities.

The active ingredients can be used as mixtures with fertilisers (e.g. nitrogen-, potassium- or phosphorus-containing fertilisers). Compositions comprising only granules of fertiliser incorporating, for example coated with, the compound, are preferred. Such granules suitably contain up to 25% by weight of the compound.

The invention therefore also provides, in a further aspect, a fertiliser composition comprising a compound of general formula A.

The compositions may also be in the form of liquid preparations for use as dips or sprays which are generally aqueous dispersions or emulsions containing the active ingredient in the presence of one or more wetting agent(s), dispersing agent(s), emulsifying agent(s) or suspending agent(s). These agents can be cationic, anionic or nonionic agents. Suitable cationic agents are quaternary ammonium compounds, for examplecetyltrimethylammonium bromide.

Suitable anionic agents are soaps, salts of aliphatic monoesters of sulphuric acid (for example sodium lauryl sulphate), and salts of sulphonated aromatic compounds (for example sodium dodecylbenzenesulphonate, sodium, calcium or ammonium lignosulphonate, butylnaphthalene sulphonate, and a mixture of sodium diisopropyl- and triisopropyl-naphthalene sulphonates).

Suitable non-ionic agents are the condensation products of ethylene oxide with fatty alcohols such as oleyl or cetyl alcohol, or with alkyl phenols such as octyl- or nonyl- phenol and octylcresol. Other non-ionic agents are the partial esters derived from long chain fatty acids and hexitol anhydrides, the condensation products of the said partial esters with ethylene oxide, and the lecithins. Suitable suspending agents are hydrophilic colloids (for example polyvinylpyrrolidone and sodium carboxymethyl-cellulose), and the vegetable gums (for example gum acacia and gum tragacanth).

The compositions for use as aqueous dispersions or emulsions are generally supplied in the form of a concentrate containing a high proportion of the active ingredient(s), the concentrate to be diluted with water before use. These concentrates often should be able to withstand storage for prolonged periods and after such storage be capable of dilution with water in order to form aqueous preparations which remain homogeneous for a sufficient time to enable them to be applied by conventional spray equipment. The concentrates may conveniently contain up to 95%, suitably 10-85%, for example 25-60%, by weight of the active ingredient(s).When diluted to form aqueous preparations, such preparations may contain varying amounts of the active ingredient(s) depending on the intended purpose, but an aqueous preparation containing 0.0005% or 0.01% to 10% by weight of active ingredient(s) may be used.

The compositions can comprise also other compound(s) having biological activity [for example complementary fungicidal or insecticidal activity], as well as stabilising agent(s), for example epoxides (e.g.

epichlorhydrin).

The compounds of formula A can be synthesized by the reaction of a 1-phenyl uracil with a polyhaloalkylsulphenyl halide or a polyhalovinylsulphenyl halide in the presence of an alkali metal. The synthesis is generally conducted by reacting an alkali metal salt of the 1-phenyl uracil in a reaction medium which may be water, an organic solvent such as an aromatic hydrocarbon, an alcohol or a halogenated hydrocarbon, or a mixture thereof with the desired sulphenyl halide. The sulphenyl halide may be diluted in an organic solvent inert to the reaction, such as a hydrocarbon or a halogenated hydrocarbon solvent, prior to addition to the reaction medium. The reaction is generally conducted at about room temperature or lower and with agitation of the reaction medium.

The 1-phenyl uracil starting materials of the following formula:

wherein R, R2, R3, R4, X and Y are as defined above, can be prepared following the methods of Senda et al., Chem. Pharm. Bull. 20(7), 1380-1388(1972) and and 22(1), 189-195(1974).

Specific chemical substances useful as active ingredients in the compositions of the invention, and methods for preparing them, are set out in Examples 1 to 9 below. Examples 10 to 21 illustrate compositions according to the invention.

Examples 20 and 21 also illustrate methods of combating plant fungal and bacterial pests according to the invention and the activity of the active ingredients used in the invention compositions. Temperatures are given in degrees Centigrade.

Example 1 A mixture of N-ethoxycarbonylcyanoacetamide (42 g), triethylorthoformate (40 g) and acetic anhydride (100 ml) is heated at reflux for one hour. The reaction is allowed to stand until cool and then is filtered, washing with ether, to yield a-cyano-(3-ethoxy-N-ethoxycarbonylacrylamide.

To a-cyano-ss-ethoxy-N-ethoxycarbonylacrylamide (1.2 g), dissolved in about 5 ml of boiling ethanol, is added 0.6 g of 2,6-dimethylaniline. The reaction is refluxed for several hours and then hexane is added. On cooling, the reaction is filtered, and washed with ethanol and ether to give a-cyano-ss-(2,6-dimethylanilino)- N-ethoxycarbonylacrylamide, m.p. 138-140".

A mixture of x-cyano-p-(2,6-dimethylanilino)-N-ethoxy-carbonylacrylamide (1.2 g) and about 10 ml of p-cymene is heated at reflux for about 11/2 hours. After cooling on standing, the crystalline product is collected by filtering and washing with ether to yield 5-cyano-1-(2,6-dimethylphenyl)uracil, m.p. 267-2699 To an ice cold solution of 2.40 g of sodium hydroxide in 70 ml of water is added 14.46 g (0.06 mol) of 5-cyano-1-(2,6-dimethylphenyl)uracil. Then 100 ml of dichloromethane is added. To this mixture, at 5 , is added 6.6 ml (0.06 mol) of trichioromethane sulphenyl chloride in two volumes of dichloromethane.The mixture is stirred approximately 22 min at 5 . Then the phases are separated and the organic phase is washed with ice cold water. The dichloromethane solution is dried over magnesium sulphate, filtered and stripped. The residue is triturated with ether/pentane, filtered and dried to obtain the crude product, which is then purified by crystallisation to yield 5-cyano-1-(2,6-dimethylphenyl)-3-trichloromethane-sulphenyluracil, m.p.223-225 .

The sodium salt of 5-cyano-1-phenyl-uracil is reacted with each of dichlorofluoromethane sulphenyl chloride and trichloromethane sulphenyl chloride following the foregoing procedure to yield 5-cyano-3dichlorofluoromethane sulphenyl-1-phenyl-uracil and 5-cyano-1 -phenyl-3-tnchlornmethane sulphenyl uracil.

Example 2 A mixture of a-cyano-p-ethoxy-N-ethoxycarbonylacrylamide (10 g) and 45 ml of ethanol is heated to affect dissolution. Then 8.12 g of p-trifluoromethylaniline in 10 ml of ethanol is added and the mixture heated at reflux for 45 minutes. The mixture is cooled and filtered to give 14.01 g of a-cyano-ss-(4-trifluoromethyl- anilino)-N-ethoxycarbonylacrylamide, which is added to about 60 ml of tetralin and heated at reflux for several hours. On formation of precipitate, the mixture is allowed to cool and then filtered, washed with ether, to yield 5-cyano-1 -(4-trifi uoromethyl phenyl)uracil, m.p. 230.5-231.5".

To 290 mg of NaOH in 15 ml of water, cooled in an ice bath, is added 1.0 g (3.56 mol) of 5-cyano-1 -(4-trifluoromethylphenyl)uracil. Then 15 ml of dichloromethane is added, followed by 0.725 ml of trichloromethanesulphenyl chloride in 1.5 ml of dichloromethane. The mixture is stirred for approximately 2 hours at 5 . Then dichloromethane and ice cold water are added and the layers separated. The organic phase is washed with ice cold water, dried over MgSO4 and evaporated. The product is taken up with ether, filtered and washed again with ether to yield 5-cyano-3-trichloromethanesulphenyl-1 -(4-trifluoromethylphenyl)uracil, m.p. 167-168.5".

Example 3 Following the method of Example 2,4-fluoroaniline (0.05 mol) is reacted with a-cyano-P-ethoxy-N-ethoxy- carbonylacrylamide (0.05 mol) and heated at reflux in tetralin to yield 5-cyano-1-(44luorophenyl)uracil, which is then reacted with trichloromethanesulphenyl chloride, in NaOH and dichloromethane, to yield the final product,5-cyano-1-(4-fluorophenyl)-3-trichloromethanesulphenyluracil, m.p. 163-165.5".

In like manner, 5-cyano-1-(2,4-difluorophenyl)uracil is prepared, starting with 2,4-difluoroaniline, and is then reacted with trichloromethanesulphenyl chloride, giving 5-cyano-1 -(2,4-difluorophenyl)-3- trichloromethanesulphenyluracil, m.p. 196-198".

Example 4 Following the procedures hereinabove, each of 4-chioroaniline, 2,6-difluoroaniline, 4-methoxyaniline, 3-fluoroaniline, 2,6-dichloroaniline, 2,4,6-trichloroaniline, 3,4-dichloroaniline, 3,5-dichloroaniline, 2- methoxyaniline, 4-nitroaniline, 4-ethylaniline, 4-methoxy-2-methylaniline, 4-(N,N-dimethyl)aniline, 2- bromoaniline, 4-methylaniline, 4-isopropylaniline, 44-butylaniline, 4-acetylaniline, 24luoroaniline, 2- cyanoaniline, 4-methylthioaniline, 24luoro-4-methylaniline, 4-chloro-24luoroaniline, 4-fluoro-2- methylaniline, 4-trifluoromethylthioaniline, 2-chloro-4-cyanoaniline, 4-chloro-2,6-difluoroaniline, 4-chloro-2- cyanoaniline, 2,4-dimethoxyanil ine, 2-chloro-6-methylaniline, 4-cyclopropylaniline, 2,6-dimethyl-4-t- butylaniline, 2,4,6-trimethylaniline, 4-chloro-2,6-dimethylaniline, 2-trifluoromethylaniline, 3,4-methylene- dioxyaniline, 4-bromo-2-fluoroaniline, 2-fluoro-4-trifluoromethylaniline, 2-chloro-4-trifluoromethylaniline, and 2-methyl-4-trifluoromethylaniline is reacted with a a-cyano-l:\-ethoxy-N-ethoxycarbonylacrylamide to yield the respective ss-anilino compound. Each Banilino compound is cyclised to yield the respective 5-cyano-1 -substituted phenyl uracil under col. I, which is then reacted with trichloromethanesulphenyl chloride to yield the final product under col. II.

5-cyano-1 -(4-chlorophenyl)uracil 5-cyano-1-(2-,6-difluorophenyl)uracil 5-cyano-1 -(4-methoxyphenyl )uracil 5-cyano-1-(3-fluorophenyl)uracil 5-cyano-1 -(2,6-dichlorophenyl)uracil 5-cyano-1-(2,4,6-trichlorophenyl)uracil 5-cyano-1-(3,4-dichlorophenyl)uracil 5-cyano-1-(3,5-dichlorophenyl)uracil 5-cyano-1-(2-methoxyphenyl)uracil 5-cyano-1 -(4-nitrophenyl)uracil 5-cyano-1-(4-ethylphenyl)uracil 5-cyano-1 -(4-m ethoxy-2-methyl phenyl)uracil 5-cyano-1 -(N,N-dimethyl)phenyl)uracil 5-cyanol-(2-bromophenyl)uracil 5-cyano-1 -(4-methylphenyl)uracil 5-cyano-1 -(4-isopropylphenyl )uracil 5-cyano-1 -(4-t-butylphenyl)uracil 5-cyano-1 -(4-acetylphenyl)uracil 5-cyano-1-(2-fluorophenyl)uracil 5-cyano-1 -(2-cyanophenyl)uracil 5-cyano-1 -(4-methylthiophenyl)uracil 5-cyano-1 -(2-fluoro-4-methylphenyl)uracil 5-cyano-l -(4-chloro-2-fluorophenyl )uracil 5-cyano-1 -(4-fluoro-2-methyl phenyl)uracil 5-cyano-1 -(4-trifluoromethylthiophenyl)uracil 5-cyano-1 -(2-chloro-4-cyanophenyl)uracil 5-cyano-1 -(4-chloro-2,6-difluorophenyl)u racil 5-cyano-1 -(4-chloro-2-cyanophenyl )uracil 5-cyano-1 -(2,4-dimethoxyphenyl)uracil 5-cyano-1 -(2-chloro-6-methyl phenyl)uracil 5-cyano-1 -(4-cyclopropylphenyl)uracil 5-cyano-1-(2,6-dimethyl-4-t-butylphenyl)uracil 5-cyano-1-(2,4,6-trimethylphenyl)uracil 5-cyano-1 -(4-chloro-2,6-dimethylphenyl)u racil 5-cyano-1-(2-trifluornmethylphenyl)uracil 5-cyano-1-(3,4-methylenedioxyphenyl)uracil 5-cyano-1 -(4-bromo-2-fluorophenyl)uracil 5-cyano-1 -(2-fluoro-4-trifluoromethylphenyl)uracil 5-cyano-1 -(2-chloro-4-trifluoromethylphenyl)uracil 5-cyano-1 -(2-methyl-4-trifluoromethylphenyl)uracil II 5-cyano-1 -(4-chlorophenyl)-3-trichloromethanesulphenyluracil 5-cyano-1-(2,6-difluorophenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(4-methoxyphenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(3-fluorophenyl)-3-trichloromethanesulphenyluracil 5-cyano-1-(2,6-dichlorophenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(2,4,6-trichlorophenyl )-3-trichloromethanesulphenyluracil 5-cyano-1-(3,4-dichlorophenyl)-3-trichloromethanesulphenyluracil 5-cyano-1-(3,5-dichlorophenyl)-3-trichlornmethanesulphenyluracii 5-cyano-1 -(2-methoxyphenyl )-3-trichloromethanesulphenyl uracil 5-cyano-1 -(4-nitrophenyl)-3-trichloromethanesulphenyl uracil 5-cyano-1 -(4-ethyl phenyl-3-trichloromethanesulphenyl uracil 5-cyano-1 -(4-methoxy-2-methyl )-3-trichloromethanesulphenyluracil 5-cyano-1 -[4-(N,N-dimethyl)phenyl]-3-trichloromethanesulphenyluracil 5-cyano-1 -(2-bromophenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(4-methylphenyl )-3-trichloromethanesulphenyluracil 5-cyano-1-(4-isopropylphenyl-3-trichloromethanesulphenyluracil 5-cyano-1 -(4-t-butyl phenyl)-3-trichloromethanesul phenyluracil 5-cyano-1 -(4-acetylphenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(2-fluorophenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(2-cyanophenyl )-3-trichloromethanesulphenyluracil 5-cyano-1 -(4-methylthiophenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(2-fluoro-4-methylphenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(4-chloro-2-fluorophenyl )-3-trichloromethanesul phenyl uracil 5-cyano-1-(4fluoro-2-methylphenyl)-3-trichloromethanesulphenyluracil 5-cyano-3-trichloromethanesulphenyl-1 -(4-trifluoromethylthiophenyl)uracil 5-cyano-1 -(2-chloro-4-cyanophenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(4-chloro-2,6-difluorophenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(4-chloro-2-cyanophenyl)-3-trichloromethanesulphenyluracil 5-cyano-1-(2,4-dimethoxyphenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(2-chloro-6-methyl phenyl)-3-trich loromethanesulphenyluracil 5-cyano-1-(4-cyclopropylphenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(2,6-dimethyi-4-t-butyl phenyl)-3-trichloromethanesu I phenyluracil 5-cyano-3-trichloromethanesulphenyl-1 -(2,4,64rimethylphenyl)uracil 5-cyano-1 -(4-chloro-2,6-dimethylphenyl)-3-trichloromethanesulphenyluracil 5-cyano-3-trichloromethanesulphenyl-1 -(2-trifluoromethylphenyl)uracil 5-cyano-1 -(3,4-methylenedioxyphenyl)-3-trichloromethane-sulphenyluracil 5-cyano-1 -(4-bromo-2-fluorophenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(2-fluoro-4-trifluoromethylphenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(2-chloro-4-trifluoromethylphenyl)-3-trichloromethanesulphenyluracil 5-cyano-1 -(2-methyl-4-trifluoromethylphenyl)-3-trichloromethanesulphenyluracil Example 5 To an ice cold solution of 1.60 g (0.04 mol) of NaOH in 45 ml of water is added 9.64 g (0.04 mol) of 5-cyano-1 -(2,6-dimethylphenyl)uracil, obtained as in Example 1. After dissolution, 50 ml of ice cold dichloromethane is added, followed by a solution of 9.36 g (0.04 mol) of 1,1,2,2-tetrachloroethanesulphenyl chloride (prepared by the method of U.S. Patent 3,395,180) in 15 mF. of dichloromethane. The mixture is stirred for 30 min at 4 . The aqueous layer is separated and discarded. The dichloromethane solution is dried and stripped at aspirator pressure. The unreacted sulphenyl chloride is then removed by trituration with pentane/dichloromethane (4:1). The resultant crude product is purified by slurrying at 30 in 60 ml of ethanol-free chloroform, allowed to cool to RT and filtered.To the filtrate is added hexane to the cloud point, and the mixture is then filtered to yield 5-cyano-1-(2,6-dimethylphenyl)-3-(1,1,2,2- tetrachloroethanesu Iphenyl)uracil, m. 180-183".

The sodium salt of each of 5-cyano-1 -(2-methylphenyl)-uracil, 5-cyano-1 -(2-chlorophenyl)uracil, 5-cyano-1 - (2,6-dichlorophenyl)uracil, 5-cyano-1 -(2,6-dimethylphenyl)-6-methyluracil, 5-carbamoyl-1 -(2,6- dimethylphenyl)uracil and l-(2,6-dimethyl 1-(2,6-dimethylphenyl)uracil is reacted with 1,1 ,2,2-tetrachloroethanesulphenyl chloride to yield the respective below-listed compound: 5-cyano-1-(2-methylphenyl)-3-(1,1,2,2-tetrachloroethanesulphenyl)uracil 5-cyano-1 -(2-chlorophenyl)-3-(1,1,2,2-tetrachloroethanesulphenyl)uracil 5-cyano-1 -(2,6-dichlorophenyl)-3-(1 ,1 ,2,2-tetrachloroethanesulphenyl)uracil 5-cyano-1 -(2,6-dimethylphenyl)-6-methyl-3-(1,1,2,2-tetrachloroethanesulphenyl)uracil 5-carbamoyl-1 -(2,6-dimethyl phenyl )-3-( 1,1 ,2,2-tetrachloroethanesulphenyl)uracil 1-(2,6-dimethylphenyl)-3-(1,1,2,2-tetrachloroethanesulphenyl)uracil Example 6 Following the procedure of Example 1, the sodium salt of each of 5-cyano-1-(2,6-dimethylphenyl)-6- methyl-uracil, 5-carbamoyl-1 -(2,6-dimethyiphenyl )uracil and 1-(2,6-dimethylphenyl)uracil is reacted with trichloromethanesulphenyl chloride to yield 5-cyano-1 -(2,6-dimethyl phenyl)-6-methyl-3- trichloromethanesulphenyluracil, 5-carbamoyl-1-(2,6-dimethylphenyl)-3-trichloromethane-sulphenyluracil and 1-(2,6-dimethylphenyl)-3-trichloromethanesulphenyluracil.

Example 7 Following the procedure of Example 5, the sodium saltof5-cyano-1-(2,6-dimethylphenyl)uracil and 5-cyano-l-(2-methylphenyl)uracil is each reacted with 2-fluoro-1, 1 ,2,2-tetrachloroethanesulphenyl chloride to yield 5-cyano-1-(2,6-dimethylphenyl)-3-(2-fluoro-1,1,2,2-tetrachloroethanesulphenyl)uracil and 5-cyano-1 - (2-methylphenyl)-3-(2-fluoro-1,1,2,2-tetrachloroethanesulphenyl)uracil.

Following the procedure of Example 1, trichloromethanesulphenyl chloride is reacted with the sodium salt of each of 5-cyano-1-(2-ethylphenyl)uracil,5-cyano-1-(2,6-diethylphenyl)uracil and 5-cyano-1 -(2- isopropylphenyl)-uracil to yield 5-cyano-1-(2-ethylphenyl)-3-trichloromethanesulphenyluracil,5-cyano-1- (2,6-diethylphenyl)-3-trichloromethanesulphenyluracil and 5-cyano-1 -(2-isopropyl-phenyl)-3- trichloromethanesulphenyluracil.

Similarly, bromodichloromethanesulphenyl chloride is reacted with the sodium salt of 5-cyano-1-(2methylphenyl)uracil and 5-cyano-1 -(2,6-dimethylphenyl)uracil to prepare 5-cyano-1 -(2-methylphenyl)-3- bromodichloromethansulphenyluracil.

Example 8 The sodium salt of 5-cyano-1 -(2,6-dimethylphenyl)-uracil is reacted with each of 1 ,2-dibromo-1 ,2-dichloro- ethanesulphenyl chloride and pentachloroethanesulphenyl chloride to yield 5-cyano-1-(2,6-dimethylphenyl)- 3-(1 ,2-dibromo-1 ,2-dichloroethanesulphenyl)uracil and 5-cyano-1 -(2,6-dimethylphenyl)-3- pentachloroethanesulphenyluracil.

Following the procedure of Example 5, trichloroethenesulphenyl chloride is reacted with sodium salt of each of 5-cyano-1 -(2,6-dimethylphenyl)uracil, 5-cyano-1 -(2-methylphenyl)uracil, 5-cyano-1 (2- ethylphenyl)uracil and 5-cyano-1 -(2,6-diethylphenyl)uracil to yield 5-cyano-1 -(2,6-dimethylphenyl)-3- trichloroethenesulphenyluracil, 5-cyano-1 -(2-methylphenyl)-3-trichloroethensulphenyluracil, 5-cyano-1 -(2- ethylphenyl)-3-trichloroethenesulphenyluracil and 5-cyano-1 -(2,6-diethylphenyl)-3- trichloroethenesulphenyluracil.

Example 9 The sodium salt of each of 5-cyano-1-(2,6-dimethylphenyl)uracil, 5-cyano-1-(2-methylphenyl)uracil, 5-cyano-1 -(2-ethylphenyl)uracil and 5-cyano-1 -(2,6-diethylphenyl)-uracil is reacted with dichlorof luoromethanesuiphenyl chloride using the procedure of Example 1 to yield 5-cyano-3 dichlorofluoromethanesulphenyl-l -(2,6-dimethylphenyl)uracil, m.p. 196.5-1 98.5'C, 5-cyano-3-dichloro- fluoromethanesulphenyl-1 -(2-methylphenyl)uracil, 5-cyano-3-dichlorofluoromethanesulphenyl-1 -(2- ethylphenyl)uracil, and 5-cyano-3-dichlorofluoromethanesulphenyl-1 -(2,6-di-etbylphenyl)uracil.

Example 10 An emulsifiable concentrate was made up by mixing the ingredients, and stirring the mixture until all the constituents were dissolved.

Compound of Example 1 10% Ethylene dichloride 40% Calcium dodecylbenzenesulphate 5% "Lubrol" L (Registered Trade Mark) 10% "Aromasol" H (Registered Trade Mark) 35% Example ii A composition in the form of grains readily dispersible in a liquid, e.g. water, was prepared by grinding together the first three ingredients in the presence of added water and then mixing in the sodium acetate.

The resultant mixture was dried and passed through a British Standard mesh sieve, size 44-100, to obtain the desired size of grains.

Compound of Example 1 50% "Dispersol" T (Registered Trade Mark) 25% "Lubrol" APN 5 1.5% Sodium acetate 23.5% Example 12 The ingredients were all ground together to produce a powder formulation readily dispersible in liquids.

Compound of Example 1 45% "Dispersol" T 5% "Lissapol" NX (Registered Trade Mark) 0.5% "Cellofas" B600 (Registered Trade Mark) 2% Sodium acetate 47.5% Example 13 The active ingredient was dissolved in a solvent and the resultant liquid was sprayed on to the granules of China clay. The solvent was then allowed to evaporate to produce a granular composition.

Compound of Example 1 5% China clay granules 95% Example 14 A composition suitable for use as a seed dressing was prepared by mixing the three ingredients.

Compound of Example 1 50% Mineral oil 2% China clay 48% Example 15 A dusting powder was prepared by mixing the active ingredient with talc.

Compound of Example 5 (first made) 5% Talc 95% Example 16 A Col formulation was prepared by ball-milling the constituents set out below and then forming an aqueous suspension of the ground mixture with water.

Compound of Example 1 40% "Dispersol" T 10% "Lubrol" APNS 1% Water 49% Example 17 A dispersible powder formulation was made by mixing together the ingredients set out below and then grinding the mixture until all were thoroughly mixed.

Compound of Example 1 25% "Aerosol" OT/B (Registered Trade Mark) 2% "Dispersol" A.C. 5% China clay 28% Silica 40% Example 18 This Example illustrates the preparation of a dispersible powder formulation. The ingredients were mixed and the mixture then ground in a comminution mill.

Compound of Example 5 (first made) 25% "PERMINAL" BX (Registered Trade Mark) 1% "Dispersol" T 5% Polyvinylpyrrolidone 10% Silica 25% China clay 34% Example 19 The ingredients set out below were formulated into a dispersible powder by mixing the grinding the ingredients.

Compound of Example 1 25% "Aerosol" OTIB 2% "Dispersol" A 5% China clay 68% In Examples 10 to 19 the proportions of the ingredients given are by weight.

There now follows an explanation of the compositions or substances represented by the various Trade Marks and Trade Names mentioned above.

LUBROL L: a condensate of nonyl phenol (1 mole) with ethylene oxide (13 moles) AROMASOL H: a solvent mixture of alkyl-benzenes DISPERSOL TAND AC: a mixture of sodium sulphate and a condensate of formaldehyde with sodium naphthalene sulphonate LUBROL APN 5: a condensate of nonyl phenol (1 mole) with naphthalene oxide (5.5 moles) CELLOFAS B600: a sodium carboxymethyl cellulose thickener.

LISSAPOL NX: a condensate of nonyl phenol (1 mole) with ethylene oxide (8 moles) AEROSOL OT/B: dioctyl sodium sulphosuccinate.

PERMINAL BX: a sodium alkyl naphthalene sulphonate.

Example 20 The active ingredients (test compounds) were tested against a variety of foliar fungal diseases of plants.

The technique employed was as follows.

The plants were grown in John Innes Potting Compost (No. 1, or Seed, as appropriate) in 4 cm diameter mini-pots. A layer of fine sand was placed at the bottom of the pot to facilitate uptake of test compound by the roots. Vermiculite was used to cover the seed in the soil tests.

The test compounds were formulated either by bead-milling with aqueous Dispersol T or as a solution in acetone/ethanol which was diluted to the required concentration immediately before use. For the fol iage diseases, 100 ppm a.i. suspensions were sprayed onto the foliage and applied to the roots of the same plant via the soil. (Sprays were applied to maximum retention, and root drenches to a final concentration equivalent to approximately 40 ppm a.i./dry soil). Tween 20, to give a final concentration of 0.05%, was added when the sprays were applied to the cereals and rusts.

For most of the tests, the test compound was applied to the soil (roots) and to the foliage (by spraying) one or two days before the plant was inoculated with the disease. After inoculation, the plants were put into an appropriate environment to allow infection to take place and then incubated until the disease was ready for assessment. The period between inoculation and assessment varied from 4to 14 days according to the disease and environment.

The disease control was recorded by the following grading: 4 = No disease 3 = 0-5% 2 = 6-25% 1 = 26-60% 0 = > 60% The results are shown in Table I.

TABLE I Compound Puccinia Pyricularia Botrytis No Recondita Oryzae Cinerea (wheat) (rice) (tomato) Example No. 1 1 4 4 Example No.3 1 0 0 (first compound) Example No. 2 2 0 0 Example No.3 2 0 0 (second compound) Example No. 5 0 4 2 (first compound) Example No. 9 0 4 1 (first compound) The compound of Example No. 5 also displayed activity against the diseases Venturia inaequalis (scab on applies) and Plasmopora viticola I Example 21 This Example illustrates the control of the rice bacterial disease Xanthomonas oryzae according to the invention process. The test procedure is described below and thereafter, in the Table, are set out the results.

Rice seedlings at the one to two leaf stage were root drenched (10 ml) and sprayed with the chemical compound under test. Forty eight hours later the plants were inoculated by cutting off the tips of the leaves with scissors dipped in a dispersion of a billion cells/ml (109 cells/ml) of Xanthomonas oryzae. After 7 days at 100% relative humidity at 30"C the seedlings were assessed for disease on a 0 - 4 scale, where 0 is no control, 1 is slight control, 2 is fair control, 3 is good control and 4 is complete control. Results are shown in Table II below.

TABLE II Compound Rate of application Root Spray in Drench Test Parts per million Test (p.p.m.) 50 4 4 Example No. 1 10 3 3 (first compound) 5 2 3 Example No. 5 50 4 3 (first compound) 25 4 0 50 4 4 Example No. 9 25 3 4 (first compound) 10 3 1 34

Claims (5)

1. A pesticidal composition comprising, as an active ingredient, a compound having the following formula:

wherein, R is hydrogen, methyl or ethyl; R1 is polyhaloalkyl or polyhalovinyl; R2 is lower alkyl, lower alkoxy, bromo, chloro, fluoro, lower haloalkyl, cyano, nitro, lower alkylthio, hydroxy, lower alkylcarbonyl, lower alkoxycarbonyl, lower haloalkoxy, cycloalkyl, or cycloalkalkyl; R3 is hydrogen or independently selected from the values of R2; R4 is hydrogen or independently selected from the values of R2; X is hydrogen, carbamoyl, or cyano, andy is zero, one, two or three.

2. A pesticidal composition comprising, as an active ingredient, a compound offormula A wherein R is hydrogen; R1 is SIC13 or SCCl2CHCL2; y is zero; X is cyano; and R3 and R4 are lower alkyl, especially methyl.

3. Afungicidal and bactericidal composition comprising, as an active ingredient, the compound having the formula

4. A process for combating pests, especially fungi and bacteria, which comprises treating plants or seeds, or their loci, with a composition, or active compound, as claimed, or defined, in any of the preceding claims, or as defined in any of Examples 1 to 22.

5. A process for combating the diseases Xanthomonas oryzae and Pyricularia oryzae which comprises treating rice plants or seeds, or their loci, with the compound having the structure:

or a composition containing the same.