Iminothiazolines, their production and use as herbicides, and intermediates for their production

Abstract

An iminothiazoline compound of the formula: ##STR1## which is useful as a herbicide.

Description

The present invention relates to iminothiazolines, their production and use as herbicides, and intermediates for their production. More particularly, it relates to iminothiazoline compounds having strong herbicidal potency and showing noticeable selectivity between crop plants and weeds, and intermediate compounds for production of said iminothiazoline compounds.

Some certain iminothiazolidine derivatives are known to be useful as active ingredients in herbicidal compositions (cf. EP-A-0349282). However, their herbicidal potency is not sufficiently high, or their selectivity between crop plants and weeds is not always sufficient. Thus, they can hardly be said to be satisfactory herbicides.

An extensive study has been made seeking satisfactory herbicides, and as the result, it has been found that iminothiazoline compounds of the formula: ##STR2## wherein R.sup.1 is a halogen atom, a halogen-substituted C.sub.1 -C.sub.2 alkyl group or a halogen-substituted C.sub.1 -C.sub.2 alkyloxy group, R.sup.2 is a methyl group, an ethyl group, a chlorine atom, a bromine atom or an iodine atom and R.sup.3 is a formyl group, a C.sub.1 -C.sub.6 alkylcarbonyl group, a benzylcarbonyl group, a C.sub.3 -C.sub.4 alkenyloxycarbonyl group, a C.sub.3 -C.sub.4 alkynyloxycarbonyl group, a C.sub.1 -C.sub.6 alkyloxycarbonyl group, a C.sub.1 -C.sub.6 alkyloxycarbonyl group substitued with C.sub.1 -C.sub.2 alkyloxy or phenyl, a cyclo(C.sub.3 -C.sub.6)alkylcarbonyl group, a cyclo(C.sub.3 -C.sub.6)alkylcarbonyl group substituted with methyl, a cyclo(C.sub.3 -C.sub.6)alkyloxycarbonyl group, a benzoyl group, an N-(C.sub.1 -C.sub.3)alkylcarbamoyl group, a phenoxycarbonyl group, a halogen-substituted C.sub.1 -C.sub.6 alkylcarbonyl group or a halogen-substituted C.sub.1 -C.sub.3 alkylsulfonyl group, provided that when R.sup.2 is a chlorine atom, a bromine atom or an iodine atom, R.sup.1 is a halogen atom or a halogen-substituted C.sub.1 -C.sub.2 alkyl group-and R.sup.3 is a C.sub.1 -C.sub.6 alkylcarbonyl group, a C.sub.1 -C.sub.6 alkyloxycarbonyl group, a C.sub.1 -C.sub.6 alkyloxycarbonyl group substituted with C.sub.1 -C.sub.2 alkyloxy or phenyl, a benzoyl group, a phenoxycarbonyl group or a halogen-substituted C.sub.1 -C.sub.6 alkylcarbonyl group exhibit strong herbicidal potency, and some of them show noticeable selectivity between crop plants and weeds. This invention is based on the above finding.

In the foregoing and subsequent descriptions, the carbon number indicates that of a group (i.e. alkyl, alkenyl or alkynyl) immediately following the same. In case of a C.sub.1 -C.sub.6 alkylcarbonyl group, for instance, the carbon number indicates that of its alkyl portion and does not include that of its carbonyl portion. In case of a C.sub.3 -C.sub.4 alkynyloxycarbonyl group, the carbon number indicates that of its alkynyl portion and does not include that of its carbonyl portion.

Also, a group substituted with a substituent(s) (e.g. C.sub.1 -C.sub.2 alkyloxy, phenyl, methyl) covers a group bearing 1 or 2 substituents. For instance, a C.sub.1 -C.sub.6 alkyloxycarbonyl group substituted with C.sub.1 -C.sub.2 alkyloxy or phenyl covers a C.sub.1 -C.sub.6 alkyloxycarbonyl group substituted with one or two C.sub.1 -C.sub.2 alkyloxys and a C.sub.1 -C.sub.6 alkyloxycarbonyl group substituted with 1 or 2 phenyls. The term "halogen-substituted" is intended to mean usually "substituted with not more than five halogens", particularly "substituted with not more than three halogens".

The iminothiazoline compounds (I) produce generally strong herbicidal activity against a wide variety of weeds including broad-leaved weeds and Graminaceous weeds in agricultural plowed fields by foliar or soil treatment without producing any material phytotoxicity to crop plants. Examples of the broad-leaved weeds include common purslane (Portulaca oleracea), common chickweed (Stellaria media), common lambsquarters (Chenopodium album), redroot pigweed (Amaranthus retroflexus), radish (Raphanus sativus), wild mustard (Sinapis arvensis), shepherdspurse (Capsella bursa-pastoris), hemp sesbania (Sesbania exaltata), sicklepod (Cassia obtusifolia), velvetleaf (Abutilon theophrasti), prickly sida (Sida spinosa), field pansy (Viola arvensis), catchweed bedstraw (Galium aparine), ivyleaf morningglory (Ipomoea hederacea), tall morningglory (Ipomoea purpurea), field bindweed (Convolvulus arvensis), purple deadnettle (Lamium purpureum), henbit (Lamium amplexicaure), jimsonweed (Datura stramonium), black nightshade (Solanum nigrum), persian speedwell (Veronica persica), common cocklebur (Xanthium pensylvanicum), common sunflower (Helianthus annuus), scentless chamomile (Matricaria perforata), corn marigold (Chrysanthemum segetum), etc. Examples of Graminaceous weeds include japanese millet (Echinochloa frumentacea), barnyardgrass (Echinochloa crus-galli), green foxtail (Setaria viridis), yellow foxtail (Setaria glauca), southern crabgrass (Digitaria ciliaris), large crabgrass (Digitaria sanguihalls) annual bluegrass (Poa annua), blackgrass (Alopecurus myosuroides), oats (Avena sativa), wild oats (Avena fatua), johnsongrass (Sorghum halepense), quackgrass (Agropyron repens), downy brome (Bromus tectorum), giant foxtail (Setaria faberi), fall panicum (Panicurn dichotomiflorum), shattercane (Sorghum bicolor), bermudagrass (Cynodon dactylon), etc. Advantageously, the iminothiazoline compounds (I) do not show any material chemical injury to various agricultural crops such as corn, wheat, barley, rice plant, soybean, cotton, sugar beet, etc., particularly to cotton.

The iminothiazoline compounds (I) are also effective in exterminating paddy field Weeds including Graminaceous weeds such as barnyardgrass (Echinochloa oryzicola), broad-leaved weeds such as common falsepimpernel (Lindernia procumbens), indian toothcup (Rotala indica), waterwort (Elatine triandra) and Ammannia multiflora, Cyperaceous weeds such as umbrella sedge (Cyperus difformis), hardstem bulrush (Scirpus juncoides), needle spikerush (Eleocharis acicularis) and water nutgrass (Cyperus serotinus), and others such as monochoria (Monochoria vaginalis) and arrowhead (Sagittaria pygmaea) without producing any phytotoxicity to rice plants on flooding treatment.

Among the iminothiazoline compounds (I), preferred are those wherein R.sup.1 is a trifluoromethyl group; those wherein R.sup.2 is a methyl group or an ethyl group; and those wherein R.sup.3 is a C.sub.1 -C.sub.6 alkylcarbonyl group, a C.sub.1 -C.sub.6 alkyloxycarbonyl group, a C.sub.1 -C.sub.6 alkyloxycarbonyl group substituted with C.sub.1 -C.sub.2 alkyloxy or phenyl, a cyclo(C.sub.3 -C.sub.6)alkylcarbonyl group, a cyclo(C.sub.3 -C.sub.6)alkylcarbonyl group substituted with methyl, a cyclo(C.sub.3 -C.sub.6)alkyloxycarbonyl group, a benzoyl group or a halogen-substituted C.sub.1 -C.sub.6 alkylcarbonyl group. With respect to R.sub.3, more preferred are a C.sub.1 -C.sub.4 alkylcarbonyl group, a C.sub.1 -C.sub.4 alkyloxycarbonyl group, a C.sub.1 -C.sub.4 alkyloxycarbonyl group substituted with C.sub.1 -C.sub.2 alkyloxy or phenyl, a cyclo(C.sub.3 -C.sub.6)alkylcarbonyl group, a cyclo(C.sub.3 -C.sub.6)alkylcarbonyl group substituted with methyl, a cyclo(C.sub.3 -C.sub.6)alkyloxycarbonyl group, a benzoyl group and a halogen-substituted C.sub.1 -C.sub.4 alkylcarbonyl group; furthermore preferred are a C.sub.1 -C.sub.4 alkylcarbonyl group, a C.sub.1 -C.sub.4 alkyloxycarbonyl group and a halogen-substituted C.sub.1 -C.sub.4 alkylcarbonyl group; still more preferred is a halogen-subtituted C.sub.1 -C.sub.4 alkylcarbonyl gorup; the most preferred are a difluoroacetyl group or a trifuluoroacetyl group. Typical examples of the most preferred compounds are as follows: ##STR3##

The iminothiazoline compounds (I) can be produced by various procedures, of which typical examples are shown in the following schemes I to III. ##STR4## wherein R.sup.1, R.sup.2, R.sup.3 are each as defined above R.sup.4 is a hydrogen atom or a methyl group, R.sup.5 is a C.sub.1 -C.sub.6 alkyl group, a C.sub.1 -C.sub.6 alkyloxy group, a C.sub.1 -C.sub.6 alkyloxy group substituted with C.sub.1 -C.sub.2 alkyloxy or phenyl, a cyclo(C.sub.3 -C.sub.6)alkyl group, a cyclo(C.sub.3 -C.sub.6)alkyl group substituted with methyl, a cyclo(C.sub.3 -C.sub.6)alkyloxy group, a phenyl group, a phenoxy group, a halogen-substituted C.sub.1 -C.sub.6 alkyl group or a benzyl group, R.sup.6 is a C.sub.1 -C.sub.3 alkyl group, R.sup.7 is a halogen atom or a halogen-substituted C.sub.1 -C.sub.2 alkyl group, R.sup.8 is a C.sub.1 -C.sub.6 alkyl group, a C.sub.1 -C.sub.6 alkyloxy group, a C.sub.1 -C.sub.6 alkyloxy group substituted with C.sub.1 -C.sub.2 alkyloxy or phenyl, a phenyl group, a phenyloxy group or a halogen-substituted C.sub.1 -C.sub.6 alkyl group. R.sup.9 is a formyl group, a C.sub.1 -C.sub.6 alkylcarbonyl group, a C.sub.3 -C.sub.4 alkenyloxycarbonyl group, a C.sub.3 -C.sub.4 alkynyloxycarbonyl group, a C.sub.1 -C.sub.6 alkyloxycarbonyl group, a C.sub.1 -C.sub.6 alkyloxycarbonyl group substituted with C.sub.1 -C.sub.2 alkyloxy or phenyl, a cyclo(C.sub.3 -C.sub.6)alkylcarbonyl group, a cyclo(C.sub.3 -C.sub.6)alkylcarbonyl group substituted with methyl, a cyclo (C.sub.3 -C.sub.6 ) alkyloxycarbonyl group, a benzoyl group, a phenoxycarbonyl group, a halogen-substituted C.sub.1 -C.sub.6 alkylcarbonyl group or a halogen-substituted C.sub.1 -C.sub.3 alkylsulfonyl group, R.sup.10 is a C.sub.1 -C.sub.6 alkyl group, a C.sub.1 -C.sub.6 alkyl group substituted with C.sub.1 -C.sub.2 alkyloxy or phenyl, a C.sub.3 -C.sub.4 alkenyl group or a C.sub.3 -C.sub.4 alkynyl group, R.sup.11 is a chlorine atom, a bromine atom or an iodine atom and X and Y are each-a halogen atom.

Procedures for production of the iminothiazoline compounds (I) as illustratively shown in the above schemes I to III will be hereinafter explained in detail.

Procedure (a):

The iminothiazoline compound (I) wherein R.sup.2 is a methyl group or an ethyl group and R.sup.3 is --CO--R.sup.5 is obtainable by reacting the iminothiazolidine compound (II) with a base.

The reaction is usually carried out in a solvent at a temperature of 0.degree. to 200.degree. C. for a period of 1 to 30 hours. In the reaction, the base is used in an amount of 1 to 50 equivalents to one equivalent of the iminothiazolidine compound (II). As the solvent, there may be exemplified aliphatic hydrocarbons (e.g. hexane, heptane), aromatic hydrocarbons (benzene, toluene, xylene), ethers (e.g. diisopropyl ether, dioxane, tetrahydrofuran, diethylene glycol dimethyl ether), alcohols (e.g. methanol, ethanol, isopropanol, t-butanol, octanol, cyclohexanol, methylcellosolve, diethylene glycol, glycerin), acid amides (e.g. N,N-dimethylformamide), sulfur compounds (e.g. dimethylsulfoxide, sulforan), water, etc. and their mixtures. Examples of the base are an inorganic base (e.g. sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate), an alkali metal alkoxide (e.g. sodium methoxide, sodium ethoxide, potassium t-butoxide, sodium t-butoxide), etc.

After completion of the reaction, the reaction mixture may be subjected to after-treatment in a per se conventional manner such as extraction with an organic solvent and concentration. If necessary, any purification method (e.g. chromatography, recrystallization, etc.) may be further adopted to give the objective compound (I), i.e. Compound (I-1).

Procedure (b):

The iminothiazoline compound (i) wherein R.sup.2 is a methyl group or an ethyl group and R.sup.3 is --CO--R.sup.5 can be also produced by the reaction of the iminothiazolidine compound (III) with a base.

This reaction is usually carried out in a solvent at a temperature of 0.degree. to 200.degree. C. for a period of 1 to 30 hours. The base may be used in an amount of 0.5 to 50 equivalents to one equivalent of the iminothiazolidine compound (III).

The solvent and the base may be chosen from those as exemplified in Proceudre (a). Also, the reaction mixture may be subjected to after-treatment in the same way as in Procedure (a) to give the objective compound (I), i.e. Compound (I-1).

Procedure (c):

The iminothiazoline compound (I) wherein R.sup.2 is a methyl group or an ethyl group and R.sup.3 is the same as represented by R.sup.9 is obtainable by the reaction of the iminothiazoline compound (IV) with an acid chloride (V), an acid anhydride (XIV) or an acid (XXXI) in the presence of a base.

The reaction is usually performed in a solvent at a temperature of 0.degree. to 200.degree. C. for a period of 1 to 30 hours. The acid chloride (V), the acid anhydride (XIV) or the acid (XXXI) may be used in an amount of 1 to 10 equivalents to one equivalent of the iminothiazoline compound (IV), and the base may be used in an amount of 1 to 50 equivalents to one equivalent of the iminothiazoline compound (IV). When the reaction is carried with the acid (XXXI) as the reagent, a condensing agent such as dicyclohexylcarbodiimide or 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide is normally used in an amount of 1 to 10 equivalents to one equivalent of the iminothiazoline compound (IV). As the solvent, there may be exemplified aliphatic hydrocarbons (e.g. hexane, heptane, ligroin, petroleum ether), aromatic hydrocarbons (e.g. benzene, toluene, xylene), halogenated hydrocarbons (e.g. chloroform, carbon tetrachloride, dichloroethane, chlorobenzene, dichlorobenzene), ethers (e.g. diethyl ether, diisopropyl ether, dioxane, tetrahydrofuran, diethylene glycol dimethyl ether), ketones (e.g. acetone, methylethylketone, methylisobutylketone, isophorone, cyclohexanone), esters (e.g. ethyl formate, ethyl acetate, butyl acetate, diethyl carbonate), nitro compounds (e.g. nitroethane, nitrobenzene), nitriles (e.g. acetonitrile, isobutyronitrile), tertiary amines (e.g. pyridine, triethylamine, N,N-diethylaniline, tributylamine, N-methylmorpholine), acid amides (e.g. N,N-dimethylformamide), sulfur compounds (e.g. dimethylsulfoxide, sulforan), etc. and their mixtures. As the base, there may be employed an organic base (e.g. pyridine, triethylamine, N,N-diethylaniline) or the like.

After completion of the reaction, the reaction mixture may be subjected to after-treatment in the same manner as in Procedure (a) to give the objective compound (I), i.e. Compound (I-2).

Procedure (d):

The iminothiazoline compound (I) wherein R.sup.2 is a methyl group or an ethyl group and R.sup.3 is --CO--OR.sup.10 can be produced by reacting the iminothiazoline compound (I-6) with the alcohol (XV) in the presence of a base.

The reaction is usually carried out in a solvent at a temperature of 0.degree. to 200.degree. C. for a period of 1 to 30 hours. The alcohol (XV) and the base may be used respectively in amounts of 1 to 10 equivalents and 0.5 to 50 equivalents to one equivalent of the iminothiazoline compound (I-6). As the solvent, there are employed aliphatic hydrocarbons (e.g. hexane, heptane, ligroin), aromatic hydrocarbons (e.g. benzene, toluene, xylene), ethers (e.g. diethyl ether, diisopropyl ether, dioxane, tetrahydrofuran, diethyleneglycol dimethyl ether), alcohols (e.g. methanol, ethanol, isopropanol, t-butanol, octanol, cyclohexanol, methylcellosolve, diethyleneglycol, glycerin), acid amides (e.g. N,N-dimethylformamide), sulfur compounds (e.g. dimethylsulfoxide, sulforan), water, etc. and their mixtures. Examples of the base may be an inorganic base (e.g. sodium hydroxide, potassium hydroxide), an alkali metal alkoxide (e.g. sodium methoxide, sodium ethoxide), etc.

After completion of the reaction, the reaction mixture may be subjected to after-treatment in the same manner as in Procedure (a) to give the objective compound (I), i.e. Compound (I-3).

Procedure (e):

The iminothiazoline compound (I) wherein R.sup.2 is a methyl group or an ethyl group and R.sup.3 is --CONH--R.sup.6 is prepared by reacting the iminothiazolidine compound (VI) with a base.

This reaction is usually carried out in a solvent at a temperature of 0.degree. to 200.degree. C. for a period of 1 to 30 hours. The base is used in an amount of 0.5 to 50 equivalents to one equivalent of the iminothiazolidine compound (VI). Examples of the solvent are those as used in Procedure (a). As the base, there may be employed an alkali metal alkoxide (e.g. sodium methoxide, sodium ethoxide) or the like.

After completion of the reaction, the reaction mixture is subjected to after-treatment in the same way as in Procedure (a) to give the objective compound (I), i.e. Compound (I-4).

Procedure (f):

The iminothiazoline compound (I) wherein R.sup.1 is the same as represented by R.sup.7, R.sup.2, is a chlorine atom, a bromine atom or an iodine atom and R.sup.3 is --CO--R.sup.8 is prepared by reacting the iminothiazoline compound (VII) with a halogenating agent.

The reaction is usually carried out in a solvent at a temperature of 50.degree. to 150.degree. C. for a period of 2 to 10 hours. The halogenating agent may be used in an amount of 1 to 10 equivalents to one equivalent of the compound (VII). Examples of the solvent are aliphatic hydrocarbons (e.g. hexane, heptane), halogenated hydrocarbons (e.g. chloroform, carbon tetrachloride, dichloroethane), ethers (e.g. diisopropyl ether, dioxane, tetrahydrofuran, diethyleneglycol dimethyl ether), etc. and their mixtures. As the halogenating agent, there may be exemplified N-chlorosuccinimide, N-bromosuccinimide, N-iodosuccinimide, etc.

After completion of the reaction, the reaction mixture is after-treated in the same way as in Procedure (a) to give the objective compound (I), i.e. Compound (I-5) or (I-8).

Procedure (g):

The iminothiazoline compound (I) wherein R.sup.1 is the same as represented by R.sup.7, R.sup.2 is a chlorine atom, a bromine atom or an iodine atom and R.sup.3 is --CO--R.sup.8 is obtainable by reacting the iminothiazoline compound (VIII) with a halogenating agent.

The reaction is usually carried out in a solvent at a temperature of 50.degree. to 150.degree. C. for a period of 2 to 10 hours. The halogenating agent may be used in an amount of 1 to 10 equivalents to one equivalent of the iminothiazoline compound (VIII). Examples of the solvent and the halogenating agent may be those as exemplified in Procedure (f).

After completion of the reaction, the reaction mixture is after-treated in the same way as in Procedure (a) to give the objective compound (I), i.e. Compound (I-5).

Typical examples of the iminothiazoline compounds (I) produced by the above procedures are shown in Table 1.

TABLE 1______________________________________ ##STR5## (I)R.sup.1 R.sup.2 R.sup.3______________________________________CF.sub.3 CH.sub.3 CO.sub.2 C.sub.2 H.sub.5CF.sub.3 C.sub.2 H.sub.5 CO.sub.2 C.sub.2 H.sub.5CF.sub.3 CH.sub.3 CO.sub.2 CH.sub.3CF.sub.3 CH.sub.3 CO.sub.2 (i)C.sub.3 H.sub.7CF.sub.3 C.sub.2 H.sub.5 CO.sub.2 (i)C.sub.3 H.sub.7CF.sub.3 CH.sub.3 CO.sub.2 (n)C.sub.3 H.sub.7CF.sub.3 CH.sub.3 ##STR6##CF.sub.3 CH.sub.3 ##STR7##CF.sub.3 CH.sub.3 CO.sub.2 CH.sub.2 CH.sub.2 OCH.sub.3CF.sub.3 CH.sub.3 CO.sub.2 CH.sub.2 CHCH.sub.2CF.sub.3 CH.sub.3 CO.sub.2 CH.sub.2 CH(CH.sub.3).sub.2CF.sub.3 CH.sub.3 CO.sub.2 CH.sub.2 CCHCF.sub.3 CH.sub.3 CO.sub.2 CH(CH.sub.3)C.sub.2 H.sub.5CF.sub.3 C.sub.2 H.sub.5 CO.sub.2 CH.sub.2 CCHCF.sub.3 C.sub.2 H.sub.5 CO.sub.2 CH.sub.3CF.sub.3 C.sub.2 H.sub.5 COCH.sub.2 CH(CH.sub.3).sub.2CF.sub.3 CH.sub.3 ##STR8##CF.sub.3 CH.sub.3 COCH.sub.2 C(CH.sub.3).sub.3CF.sub.3 O CH.sub.3 CO.sub.2 C.sub.2 H.sub.5CF.sub.3 O CH.sub.3 CO.sub.2 (i)C.sub.3 H.sub.7CF.sub.3 C.sub.2 H.sub.5 ##STR9##CF.sub.3 C.sub.2 H.sub.5 CO.sub.2 (n)C.sub.3 H.sub.7CF.sub.3 CH.sub.3 CO(i)C.sub.3 H.sub.7CF.sub.3 CH.sub.3 CO(n)C.sub.4 H.sub.9CF.sub.3 O C.sub.2 H.sub.5 CO.sub.2 (i)C.sub.3 H.sub.7CF.sub.3 CH.sub.3 ##STR10##CF.sub.3 CH.sub.3 COC(CH.sub.3).sub.3CF.sub.3 CH.sub.3 COCH.sub.2 CH(CH.sub.3).sub.2CF.sub.3 CH.sub.3 COCH(CH.sub.3)CH.sub.2 CH.sub.3CF.sub.3 CH.sub.3 COC.sub.6 H.sub.5F CH.sub.3 CO.sub.2 C.sub.2 H.sub.5Br CH.sub.3 CO.sub.2 C.sub.2 H.sub.5Cl CH.sub.3 CO.sub.2 C.sub.2 H.sub.5I CH.sub.3 CO.sub.2 C.sub.2 H.sub.5CF.sub.3 CF.sub.2 C.sub.2 H.sub.5 CO.sub.2 (i)C.sub.3 H.sub.7CF.sub.2 HCF.sub.2 O C.sub.2 H.sub.5 CO.sub.2 (i)C.sub.3 H.sub.7CF.sub.3 C.sub.2 H.sub.5 CO.sub.2 CH.sub.2 CH.sub.2 CCHCF.sub.3 C.sub.2 H.sub.5 CO(n)C.sub.5 H.sub.11CF.sub.3 C.sub.2 H.sub.5 CO.sub.2 (n)C.sub.5 H.sub.11CF.sub.3 C.sub.2 H.sub.5 COC.sub.2 H.sub.5CF.sub.3 C.sub.2 H.sub.5 COCH.sub.3CF.sub.3 Br CO.sub.2 C.sub.2 H.sub.5CF.sub.3 Cl CO.sub.2 C.sub.2 H.sub.5CF.sub.3 Br COC.sub.6 H.sub.5CF.sub.3 Br CO.sub.2 (i)C.sub.3 H.sub.7CF.sub.3 Br CO.sub.2 CH.sub.3CF.sub.3 Br CO(n)C.sub.3 H.sub.7CF.sub.3 Br CO.sub.2 (n)C.sub.4 H.sub.9F Br CO.sub.2 C.sub.2 H.sub.5Br Br CO.sub.2 C.sub.2 H.sub.5Cl Br CO.sub.2 C.sub.2 H.sub.5CF.sub.3 Br CO.sub.2 C.sub.6 H.sub.5CF.sub.3 Br CO.sub.2 (n)C.sub.3 H.sub.7CF.sub.3 I CO.sub.2 C.sub.2 H.sub.5CF.sub.3 Br CO.sub.2 CH.sub.2 C.sub.6 H.sub.5CF.sub.3 CH.sub.3 CO.sub.2 CH.sub.2 CCCH.sub.3CF.sub.3 C.sub.2 H.sub.5 CONHC.sub.3 H.sub.7CF.sub.3 CH.sub.3 COC.sub.2 H.sub.5CF.sub.3 CH.sub.3 CO(n)C.sub.3 H.sub.7CF.sub.3 CH.sub.3 COCH.sub.2 C.sub.6 H.sub.5CF.sub.3 C.sub.2 H.sub.5 CO(n)C.sub.3 H.sub.7CF.sub.3 C.sub.2 H.sub.5 CO(i)C.sub.3 H.sub.7CF.sub.3 C.sub.2 H.sub.5 COCH.sub.2 C(CH.sub.3).sub.3F CH.sub.3 CO(CH.sub.2).sub.3 ClCl CH.sub.3 COCH.sub.2 CH.sub.2 BrCF.sub.3 CH.sub.3 CONHC.sub.2 H.sub.5CF.sub.3 C.sub.2 H.sub.5 SO.sub.2 CF.sub.3CF.sub.3 CH.sub.3 COCH.sub.2 CH.sub.2 ClCF.sub.3 Br COCH.sub.3CF.sub.3 CH.sub.3 CO(n)C.sub.5 H.sub. 11CF.sub.3 CH.sub.3 ##STR11##CF.sub.3 CH.sub.3 CO.sub.2 CH.sub.2 CHCHCH.sub.3CF.sub.3 CH.sub.3 COCH.sub.2 ClCF.sub.3 CH.sub.3 CO(CH.sub.2).sub.3 ClCF.sub.3 CH.sub.3 ##STR12##CF.sub.3 C.sub.2 H.sub.5 CONHCH.sub.3CF.sub.3 CH.sub.3 COCH.sub.2 BrCF.sub.3 CH.sub.3 COCF.sub.3CF.sub.3 C.sub.2 H.sub.5 COCF.sub.3CF.sub.3 Br COCF.sub.3CF.sub.3 CH.sub.3 COC.sub.2 F.sub.5CF.sub.3 C.sub.2 H.sub.5 COC.sub.2 F.sub.5CF.sub.3 CH.sub.3 COC.sub.3 F.sub.7CF.sub.3 O CH.sub.3 COCH.sub.3CF.sub.3 O CH.sub.3 COCF.sub.3CF.sub.3 C.sub.2 H.sub.5 ##STR13##CF.sub.3 CH.sub.3 COCHF.sub.2CF.sub.3 CH.sub.3 COCH.sub.2 FCF.sub.3 C.sub.2 H.sub.5 COCHF.sub.2CF.sub.3 O C.sub.2 H.sub.5 COCH.sub.3CF.sub.3 O C.sub.2 H.sub.5 COCF.sub.3CF.sub.3 O CH.sub.3 COCHF.sub.2CF.sub.3 O C.sub.2 H.sub.5 COCHF.sub.2______________________________________

The compounds (III), (XI), (IV) and (VIII) used as the starting materials for production of the iminothiazoline compound (I) in the above procedures are novel and may be produced, for instance, by the processes as set forth below.

Compound (III):

The compound (III) is produced by reacting the aniline compound (IX) with an isothiocyanate (X).

The reaction is usually carried out in a solvent at a temperature of 0.degree. to 200.degree. C. for a period of 1 to 30 hours. The isothiocyanate (X) is normally used in an amount of 1 to 5 equivalents to one equivalent of the aniline compound (IX). As the solvent, there may be employed aliphatic hydrocarbons (e.g. hexane, heptane, ligroin, petroleum ether), aromatic hydrocarbons (e.g. benzene, toluene, xylene), halogenated hydrocarbons (e.g. chloroform, carbon tetrachloride, dichloroethane, chlorobenzene, dichlorobenzene), ethers (e.g. diethyl ether, diisopropyl ether, dioxane, tetrahydrofuran, diethyleneglycol dimethyl ether), ketones (e.g. acetone, methylethylketone, methylisobutylketone, isophoron, cylcohexanone), nitro compounds (e.g. nitroethane, nitrobenzene), acid amides (e.g. N,N-dimethylformamide), sulfur compounds (e.g. dimethylsulfoxide, sulforan), etc. and their mixtures. For acceleration of the reaction, an acid (e.g. sulfuric acid) or a base (e.g. sodium methoxide) may be present in the reaction system.

After completion of the reaction, the reaction mixture is after-treated by a per se conventional procedure. For instance, the mixture is extracted with an organic solvent, followed by concentration. If necessary, the reaction product may be purified by chromatography or recrystallization to give the objective compound (III).

Still, the above reaction can proceed through the compound (III) to the iminothiazoline compound (I) in a single operation depending upon the the kind of the compound (III) and the reaction conditions (cf. Procedure (b)).

In an alternative way, the compound (III) may be produced by reacting the iminothiazolidine compound (II) with a base. This reaction is ordinarily carried out in a solvent at a temperature of 0.degree. to 200.degree. C. for a period of 1 to 30 hours. The base is used normally in an amount of 1 to 50 equivalents to one equivalent of the iminothiazolidine compound (II). As the solvent, there may be employed aliphatic hydrocarbons (e.g. hexane, heptane, ligroin, petroleum ether), aromatic hydrocarbons (e.g. benzene, toluene, xylene), ethers (e.g. diethyl ether, diisopropyl ether, dioxane, tetrahydrofuran, diethyleneglycol dimethyl ether), alcohols (e.g. methanol, ethanol, isopropanol, t-butanol, octanol, cyclohexanol, methylcellosolve, diethylene glycol, glycerin), acid amides (e.g. formamide, N,N-dimethylformamide, acetamide), sulfur compounds (e.g. dimethylsulfoxide, sulforan), etc. and their mixtures. Examples of the base are an inorganic base (e.g. sodium hydroxide, potassium hydroxide), an alkali metal alkoxide (e.g. sodium methoxide, sodium ethoxide, sodium t-butoxide), etc.

After completion of the reaction, the reaction mixture is after-treated in the same manner as in the previous reaction.

In another alternative way, the compound (III) is obtainable by reacting the iminothiazolidine compound (XI) with an acid chloride (XII) in the presence of a base.

This reaction is usually performed in a solvent at a temperature of 0.degree. to 200.degree. C. for a period of 1 to 30 hours. The acid chloride (XII) and the base are respectively used in amounts of 1 to 10 equivalents and 1 to 50 equivalents to one equivalent of the iminothiazolidine compound (XI). Examples of the solvent are aliphatic hydrocarbons (e.g. hexane, heptane, ligroin, petroleum ether), aromatic hydrocarbons (e.g. benzene, toluene, xylene), halogenated hydrocarbons (e.g. chloroform, carbon tetrachloride, dichloroethane, chlorobenzene, dichlorobenzene), ethers (e.g. diethyl ether, diisopropyl ether, dioxane, tetrahydrofuran, diethyleneglycol dimethyl ether), ketones (e.g. acetone, methylethylketone, methylisobutylketone, isophoron, cyclohexanone), esters (e.g. ethyl formate, ethyl acetate, butyl acetate, diethyl carbonate), nitro compounds (e.g. nitroethane, nitrobenzene), nitriles (e.g. acetonitrile, isobutyronitrile), tertiary amines (e.g. pyridine, triethylamine, N,N-diethylaniline, tributylamine, N-methylmorpholine), acid amides (e.g. formamide, N,N-dimethylformamide, acetamide), sulfur compounds (e.g. dimethylsulfoxide, sulforan), etc. and their mixtures. As the base, there may be used an organic base (e.g. pyridine, triethylamine, N,N-diethylaniline) or the like.

After completion of the reaction, the reaction mixture is after-treated in the same manner as in the previous reaction.

Typical examples of the compound (III) as obtainable by the above procedures are as follows:

TABLE 2______________________________________ ##STR14## (III)R.sup.1 R.sup.4 Rhu 6______________________________________CF.sub.3 H OC.sub.2 H.sub.5CF.sub.3 CH.sub.3 OC.sub.2 H.sub.5CF.sub.3 H OCH.sub.3CF.sub.3 H O(i)C.sub.3 H.sub.7CF.sub.3 CH.sub.3 O(i)C.sub.3 H.sub.7CF.sub.3 H O(n)C.sub.3 H.sub.7CF.sub.3 H ##STR15##CF.sub.3 H ##STR16##CF.sub.3 O CH.sub.3 ##STR17##Cl H CH.sub.3Br CH.sub.3 C.sub.2 H.sub.5CF.sub.3 CH.sub.3 CF.sub.3CF.sub.3 O H CF.sub.3CF.sub.3 H CF.sub.3CF.sub.3 H CH.sub.2 C(CH.sub.3).sub.3CF.sub.3 H ##STR18##CF.sub.3 H CH.sub.2 CH.sub.2 ClCF.sub.3 CH.sub.3 Chd 2 H.sub. 5CF.sub.3 H (i)C.sub.3 H.sub.7CF.sub.3 CH.sub.3 (n)C.sub.4 H.sub.9CF.sub.3 H OC.sub.6 H.sub.5CF.sub.3 CH.sub.3 (CH.sub.2).sub.4 ClCF.sub.3 CF.sub.2 H C hd 2 H.sub.5F H C.sub.2 H.sub.5CF.sub.2 HCF.sub.2 O CH.sub.3 C.sub.6 H.sub.5CF.sub.3 CH.sub.3 CHF.sub.2CF.sub.3 H CHF.sub.2______________________________________

Compound (XI):

The compound (XI) can be produced by reacting the aniline compound (XIII) with hydrogen sulfide.

This reaction may be accomplished in a solvent in the presence of a base at a temperature of 0.degree. to 30.degree. C. for a period of 5 minutes to 5 hours. Hydrogen sulfide is used in an equimolar amount or more to the aniline compound (XIII), while the base may be employed in a catalytic amount. As the solvent, there may be exemplified aliphatic hydrocarbons (e.g. hexane, heptane, ligroin, petroleum ether), ethers (e.g. diethyl ether, diisopropyl ether, dioxane, tetrahydrofuran, diethylene glycol dimethyl ether), alcohols (e.g. methanol, ethanol, isopropanol, t-butanol, octanol, cyclohexanol, methylcellosolve, diethylene glycol, glycerin), nitro compounds (e.g. nitroethane, nitrobenzene), tertiary amines (e.g. pyridine, triethylamine, N,N-diethylaniline, tributylamine, N-methylmorpholine), acid amies (e.g. formamide, N,N-dimethylformamide, acetamide), sulfur compounds (e.g. dimethylsulfoxide, sulforan), etc. and their mixtures. The base is chosen from an organic base (e.g. pyridine, triethylamine and N,N-diethylaniline) or the like.

After completion of the reaction, the reaction mixture is post-treated in the same manner as in the previous reaction.

Typical examples of the compounds (XI) as obtainable by the above procedure are shown in Table 3.

TABLE 3______________________________________ ##STR19## (XI) R.sup.1 R.sup.4______________________________________ CF.sub.3 H CF.sub.3 CH.sub.3 CF.sub.3 O H F H Cl H Br CH.sub.3 CF.sub.3 CF.sub.2 CH.sub.3 CF.sub.2 HCF.sub.2 O CH.sub.3______________________________________

Compound (IV):

The compound (IV) is produced by reacting the iminothiazoline compound (I-7) with trifluoroacetic acid.

This reaction is usually carried out in the presence or absence of a solvent at a temperature of 0.degree. to 0.degree. C. for a period of 1 to 10 hours. The amount of trifluoroacetic acid to be used as the reagent is usually from about 1 to 100 equivalents to one equivalent of the iminothiazoline compound (I-7). As the solvent, there may be employed aliphatic hydrocarbons (e.g. hexane, heptane, ligroin, petroleum ether), aromatic hydrocarbons (e.g. benzene, toluene, xylene), halogenated hydrocarbons (e.g. chloroform, carbon tetrachloride, dichloroethane, chlorobenzene, dichlorobenzene), ketones (e.g. acetone, methylethylketone, methylisobutylketone, isophoron, cylcohexanone), nitro compounds (e.g. nitroethane, nitrobenzene), nitriles (e.g. acetonitrile, isobutyronitrile), acid amides (e.g. formamide, N,N-dimethylformamide, acetamide), sulfur compounds (e.g. dimethylsulfoxide, sulforan), water, etc. and their mixtures.

After completion of the reaction, the reaction mixture is post-treated in the same manner as in the previous reaction.

Besides, the compound (IV) is obtainable by reacting the compound (I-9) with aqueous hydrochloric acid.

This reaction is usually performed in a solvent at a temperature of 0.degree. to 200.degree. C. for a period of 0.5 to 30 hours. Hydrochloric acid is used in an amount of 1 to 1000 equivalents to one equivalent of the compound (I-9). Examples of the solvent are alcohols (e.g. methanol, ethanol, isopropanol, methyl cellosolve), ethers (e.g. diethyl ether, diisopropyl ether, dioxane, tetrahydrofuran), water, etc., and their mixtures.

After completion of the reaction, the reaction mixture is post-treated in the same manner as in the previous reaction.

Typical examples of the compounds (IV) as obtained by the above procedure are shown in Table 4.

TABLE 4______________________________________ ##STR20## (IV) R.sup.1 R.sup.4______________________________________ CF.sub.3 H CF.sub.3 CH.sub.3 CF.sub.3 O CH.sub.3 F H Cl H Br CH.sub.3 CF.sub.3 CF.sub.2 CH.sub.3 CF.sub.2 HCF.sub.2 O CH.sub.3______________________________________

Compound (VIII):

The compound (VIII) is obtainable by reacting the iminothiazoline compound (I-8) with a reducing agent such as tributyltin hydride.

The reaction is usually performed in a solvent at a temperature of 0.degree. to 200.degree. C. for a period of 1 to 30 hours. The amount of the reducing agent may be from about 1 to 10 equivalents to one equivalent of the compound (I-8).

There may be used as the solvent aliphatic hydrocarbons (e.g. hexane, heptane, ligroin, petroleum ether), aromatic hydrocarbons (e.g. benzene, toluene, xylene), ethers (e.g. diethyl ether, diisopropyt ether, dioxane, tetrahydrofuran, diethyleneglycol dimethyl ether), ketones (e.g. acetone, methylethylketone, methylisobutylketone, isophoron, cyclohexanone), esters (e.g. ethyl formate, ethyl acetate, butyl acetate, diethyl carbonate), nitro compounds (e.g. nitroethane, nitrobenzene), nitriles (e.g. acetonitrile, isobutyronitrile), acid amides (e.g. N,N-dimethylformamide), sulfur compounds (e.g. dimethylsulfoxide, sulforan), etc. and their mixtures.

After completion of the reaction, the reaction mixture is post-treated in the same manner as in the previous reaction.

Typical examples of the compound (VIII) as obtainable by the above procedure are shown in Table 5.

TABLE 5______________________________________ ##STR21## (VIII)R.sup.7 R.sup.8______________________________________CF.sub.3 OC.sub.2 H.sub.5CF.sub.3 C.sub.2 H.sub.5CF.sub.3 CH.sub.3CF.sub.3 CF.sub.2 CH.sub.3F OCH.sub.3Cl OCH.sub.2 CH.sub.2 CH.sub.3Br (CH.sub.2).sub.3 CH.sub.3CF.sub.3 CF.sub.2 ##STR22##CF.sub.3 ##STR23##CF.sub.3 CF.sub.3CF.sub.3 O CF.sub.3______________________________________

The iminothiazolidine compound (II) may be produced by the method as described in J.Am. Chem. Soc., p.1079 (1984). Namely, the compound (II) is obtainable by reacting the aniline compound (XVI) with an isothiocyanate (X) to give the thiourea (XVII) and treating the latter with a halogenating agent. Alternatively, the compound (II) can be produced by reacting the thiourea (XVII: R=OEt) with sodium methoxide to give the thiourea (XIX) and reacting the latter with a halogenating agent to give the iminothiazolidine compound (XX), followed by treatment with the acid chloride (XII) in the presence of a base.

The compound (IX) is obtainable by reacting the aniline compound (XXI) with an alkynyl bromide (XXII) or an alkynyl methanesulfonate (XXXI) in the presence of a base. The compound (XIII) is produced by reacting the aniline compound (XXIII) with an alkynyl bromide (XXII) in the presence of a base. The compound (I-7) is produced by reacting the compound (I-6) with potassium t-butoxide. The compound (VI) is prepared by reacting the iminothiazolidine compound ##STR24## with the amine (XXV).

The iminothiazolidine compound (VII) may be obtained by reacting the thiourea (XXVI) with a halide (XXVII) to give the iminothiazoline (XXVIII), followed by treatment with an acid chloride (XXIX). The iminothiazolidine compound (VII) is also produced by treating the thiourea (XXX) with a halide (XXVII).

The iminothiazoline compound (I-8) can be obtained by reacting the iminothiazolidine (VII) with a halogenating agent (cf. Procedure (f)).

For the practical usage of the iminothiazoline (I), it is usually formulated with a conventional solid or liquid carrier(s)-or diluent(s) as well as a surface active agent(s) or auxiliary agent(s) into a conventional preparation form such as emulsifiable concentrate, wettable powder, suspension, granules or water dispersible granules. The content of the iminothiazoline compound (I) as the active ingredient in such preparation form is normally within a range of about 0.02 to 90% by weight, preferably of about 0.05 to 80% by weight. Examples of the solid carrier or diluent are fine powders or granules of kaolin clay, attapulgite clay, bentonite, terra alba, pyrophyllite, talc, diatomaceous earth, calcite, walnut shell powders, urea, ammonium sulfate and synthetic hydrous silica, etc. As the liquid carrier or diluent, there may be exemplified aromatic hydrocarbons (e.g. xylene, methylnaphthalene), alcohols (e.g. isopropanol, ethylene glycol, cellosolve), ketones (e.g. acetone, cyclohexanone, isophorone), vegetable oil (e.g. soybean oil, cotton seed oil), dimethylsulfoxide, N,N-dimethylformamide, acetonitrile, water, etc.

The surface active agent used for emulsification, dispersing or spreading may be of any type, for instance, either anionic or non-ionic. Examples of the surface active agent include alkylsulfates, alkylsulfonates, alkylarylsulfonates, dialkylsulfosuccinates, phosphates of polyoxyethylenealkylaryl ethers, polyoxyethylene alkyl ethers, polyoxyethylene alkylaryl ethers, polyoxyethylene polyoxypropylene block copolymer, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, etc. Examples of the auxiliary agent include ligninsulfonates, sodium alginate, polyvinyl alcohol, gum arabic, CMC (carboxymethyl cellulose), PAP (isopropyl acid phosphate), etc.

The iminothiazoline compound (I) thus formulated in any suitable preparation form is useful for pre-emergence or post-emergence control of undesired weeds by soil or foliar treatment as well as flood fallowing treatment. These treatments include application to the soil surface prior to or after planting, incorporation into the soil prior to planting or transplanting, etc. The foliar treatment may be effected by spraying the herbicidal composition containing the iminothiazoline compound (I) over the top of plants. It may also be applied directly to the weeds if care is taken to keep the chemical off the crop foliage.

The dosage of the iminothiazoline compound (I) may vary depending on the prevailing weather conditions, the formulation used, the prevailing season, the mode of application, the soil involved, the crop and weed species, etc. Generally, however, the dosage is from about 10 to 5000 grams, preferably from about 20 to 2000 grams, of the active ingredient per hectare. The herbicidal composition of the invention formulated in the form of an emulsifiable concentrate, a wettable powder or a suspension may ordinarily be employed by diluting it with water at a volume of about 100 to 1000 liters per hectare, if necessary, with addition of an auxiliary agent such as a spreading agent. The composition formulated in the form of granules may be normally applied as such without dilution.

Examples of the spreading agent include, in addition to the surface active agents as noted above, polyoxyethylene resin acid (ester), ligninsulfonate, abietylenic acid salt, dinaphthylmethanedisulfonate, paraffin, etc.

The iminothiazoline compound (I) is useful as a herbicide to be employed for paddy filed, crop field, orchards, pasture land, lawns, forests, non-agricultural fields, etc. Further, the iminothiazoline compound (I) may be also used together with any other herbicide to improve its activity as a herbicide, and in some cases, a synergistic effect can be expected. Furthermore, it may be applied in combination with an insecticide, an acaricide, a nematocide, a fungicide, a plant growth regulator, a fertilizer, a soil improver, etc.

The present invention will be explained more in detail by way of Preparation Examples, Reference Examples, Formulation Examples and Test Examples, to which however the invention is not limited in any way.

Practical and presently preferred embodiments for production of the iminothiazoline compound (I) are illustratively shown in the following examples.

PREPARATION EXAMPLE 1

(Procedure (a))

A solution of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl)-5-bromomethylthiazolidine (0.7 g) and potassium t-butoxide (0.25 g) in t-butanol (30 ml) was refluxed for 5 hours. After removal of the solvent under reduced pressure, the concentrated residue was extracted with chlorofom (100 ml), washed with water and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure, and the residue was subjected to column chromatography to give 0.36 g of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl)-5-methylthiazoline (Compound No. 1).

PREPARATION EXAMPLE 2

(Procedure (b))

A solution of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl)-5-methylenethiazolidine (2.0 g) and sodium methoxide (28% methanolic solution; 1.2 g) in ethanol (50 ml) was refluxed for 30 minutes. After removal of the solvent under reduced pressure, the concentrated residue was extracted with chlorofom (200 ml), washed with water and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure, and the residue was subjected to column chromatography to give 1.6 g of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl)-5-methylthiazoline (Compound No. 1).

PREPARATION EXAMPLE 3

(Procedure (c))

To a solution of 2-imino-3-(3-trifluoromethylphenyl)-5-ethylthiazoline (0.5 g) and triethylamine (0.6 g) in chloroform (30 ml), isovaleryl chloride (0.8 g) was dropwise added under stirring at room temperature, and stirring was continued for 2 hours. After removal of the solvent under reduced pressure, the concentrated residue was extracted with ethyl acetate (100 ml), washed with water and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure, and the residue was subjected to column chromatography to give 0.2 g of 2-isovalerylimino-3-(3-trifluoromethylphenyl)-5-ethylthiazoline (Compound No. 16).

PREPARATION EXAMPLE 4

(Procedure (c))

To a mixture of 2-imino-3-(3-trifluoromethylphenyl)-5-methylthiazoline hydrochloride (7.2 g) and triethylamine (7.4 g) in ethyl acetate (100 ml), trifluoroacetic acid anhydride (5.2 g) was added under stirring at room temperature, and stirring was continued for 3 hours. The residue was washed with water and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure to give a crystalline residue which was recrystallized from isopropanol to afford 2-trifluoroacetylimino-3-(3-trifluoromethylphenyl)-5-methylthiazoline (Compound No. 54) (7.5 g). m.p., 128.1.degree. C.

PREPARATION EXAMPLE 5

(Procedure (c))

A mixture of 2-imino-3-(3-trifluoromethylphenyl)-5-methylthiazoline hydrochloride (0.42 g), triethylamine (2.2 g), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (0.8 g) and difluoroacetic acid (0.75 g) in chloroform (10 ml) was refluxed for 8 hours. The residue was Washed with aqueous hydrochloric acid and aqueous potassium carbonate and dried over magnesium sulfate. The solvent was removed under reduced pressure, and the residue was subjected to column chromatography to give 2-difluoroacetylimino-3-(3-trifluoromethylphenyl)-5-methylthiazoline (Compound No. 63) (0.3 g). m.p., 117.9.degree. C.

PREPARATION EXAMPLE 6

(Procedure (d))

A solution of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl)-5-methylthiazoline (1.0 g) and sodium methoxide (28% methanolic solution; 0.6 g) in methanol (30 ml) was refluxed for 10 hours. After removal of the solvent, the residue was extracted with chloroform (100 ml), washed with water and dried over anhydrous magnesium. The solvent was removed under reduced pressure, and the residue was subjected to column chromatography to give 0.8 g of 2-methoxycarbonylimino-3-(3-trifluoromethylphenyl)-5-methylthiazoline (Compound No. 3).

PREPARATION EXAMPLE 7

(Procedure (e))

A solution of 2-(N-ethylcarbamoylimino)-3-(3-trifluoromethylphenyl)-5-methylenethiazolidine (0.2 g) and sodium methoxide (28% methanolic solution; 0.2 g ) in methanol (30 ml) was refluxed for 10 hours. After removal of the solvent, the residue was extracted with chloroform (100 ml), washed with water and dried over anhydrous magnesium. The solvent was removed under reduced pressure, and the residue was subjected to column chromatography to give 0.1 g of 2-(N-ethylcarbamoylimino)-3-(3-trifluoromethylphenyl)-5-methylthiazoline (Compound No. 44).

PREPARATION EXAMPLE 8

(Procedure (f))

A solution of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl) thiazolidine (1.6 g) and N-bromosuccinimide (2 g) in chloroform (50 ml) was refluxed for 10 hours. After cooling, the reaction mixture was washed with an aqueous sodium sulfite solution and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure, and the residue was subjected to column chromatography to give 0.9 g of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl)-5-bromothiazoline (Compound No. 30).

PREPARATION EXAMPLE 9

(Procedure (g))

A solution of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl) thiazoline (0.5 g) and N-iodosuccinimide (0.4 g) in chloroform (30 ml) was refluxed for 20 hours. After cooling, the reaction mixture was washed with an aqueous sodium sulfite solution and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure, and the residue was subjected to column chromatography to give 0.1 g of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl)-5-iodothiazoline (Compound No. 42).

In the same manner as above, the iminothiazoline compounds (I) as shown in Table 6 were obtained.

TABLE 6______________________________________ ##STR25## (I)Compound MeltingNo. R.sup.1 R.sup.2 R.sup.3 point (.degree.C.)______________________________________1 CF.sub.3 CH.sub.3 CO.sub.2 C.sub.2 H.sub.5 115.52 CF.sub.3 C.sub.2 H.sub.5 CO.sub.2 C.sub.2 H.sub.5 97.13 CF.sub.3 CH.sub.3 CO.sub.2 CH.sub.3 136.84 CF.sub.3 CH.sub.3 CO.sub.2 (i)C.sub.3 H.sub.7 126.05 CF.sub.3 C.sub.2 H.sub.5 CO.sub.2 (i)C.sub.3 H.sub.7 91.86 CF.sub.3 CH.sub.3 CO.sub.2 (n)C.sub.3 H.sub.7 91.17 CF.sub.3 CH.sub.3 ##STR26## 134.08 CF.sub.3 CH.sub.3 ##STR27## 155.79 CF.sub.3 CH.sub.3 CO.sub.2 CH.sub.2 CH.sub.2 OCH.sub.3 103.010 CF.sub.3 CH.sub.3 CO.sub.2 CH.sub.2 CHCH.sub.2 99.111 CF.sub.3 CH.sub.3 CO.sub.2 CH.sub.2 CH(CH.sub.3).sub.2 101.612 CF.sub.3 CH.sub.3 CO.sub.2 CH.sub.2 CCH 145.513 CF.sub.3 CH.sub.3 CO.sub.2 CH(CH.sub.3)C.sub.2 H.sub.5 107.814 CF.sub.3 C.sub.2 H.sub.5 CO.sub.2 CH.sub.2 CCH 125.815 CF.sub.3 C.sub.2 H.sub.5 CO.sub.2 CH.sub.3 141.416 CF.sub.3 C.sub.2 H.sub.5 COCH.sub.2 CH(CH.sub.3).sub.2 116.317 CF.sub.3 CH.sub.3 ##STR28## 132.618 CF.sub.3 CH.sub.3 COCH.sub.2 C(CH.sub.3).sub.3 123.119 CF.sub.3 O CH.sub.3 CO.sub.2 C.sub.2 H.sub.5 102.120 CF.sub.3 O CH.sub.3 CO.sub.2 (i)C.sub.3 H.sub.7 120.021 CF.sub.3 C.sub.2 H.sub.5 ##STR29## 111.722 CF.sub.3 C.sub.2 H.sub.5 CO.sub.2 (n)C.sub.3 H.sub.7 75.723 CF.sub.3 CH.sub.3 CO(i)C.sub.3 H.sub.7 139.624 CF.sub.3 CH.sub.3 CO(n)C.sub.4 H.sub.9 122.625 CF.sub.3 O C.sub.2 H.sub.5 CO.sub.2 (i)C.sub.3 H.sub.7 63.626 CF.sub.3 CH.sub.3 ##STR30## 100.327 CF.sub.3 CH.sub.3 COC(CH.sub.3).sub.3 94.728 CF.sub.3 CH.sub.3 COCH.sub.2 CH(CH.sub.3).sub.2 92.429 CF.sub.3 CH.sub.3 COCH(CH.sub.3)CH.sub.2 CH.sub.3 58.330 CF.sub.3 Br COC.sub.2 C.sub.2 H.sub.5 136.831 CF.sub.3 Cl CO.sub.2 C.sub.2 H.sub.5 138.232 CF.sub.3 Br COC.sub.6 H.sub.5 182.433 CF.sub.3 Br CO.sub.2 (i)C.sub.3 H.sub.7 106.034 CF.sub.3 Br CO.sub.2 CH.sub.3 106.835 CF.sub.3 Br CO(n)C.sub.3 H.sub.7 141.436 CF.sub.3 Br CO.sub.2 (n)C.sub.4 H.sub.9 104.937 F Br CO.sub.2 C.sub.2 H.sub.5 172.438 Br Br CO.sub.2 C.sub.2 H.sub.5 155.439 Cl Br CO.sub.2 C.sub.2 H.sub.5 147.740 CF.sub.3 Br CO.sub.2 C.sub.6 H.sub.5 137.741 CF.sub.3 Br CO.sub.2 (n)C.sub.3 H.sub.7 107.042 CF.sub.3 I CO.sub.2 C.sub.2 H.sub.5 121.643 CF.sub.3 Br CO.sub.2 CH.sub.2 C.sub.6 H.sub.5 95.244 CF.sub.3 CH.sub.3 CONHC.sub.2 H.sub.5 93.245 CF.sub.3 C.sub.2 H.sub.5 SO.sub.2 CF.sub.3 115.546 CF.sub.3 CH.sub.3 COCH.sub.2 CH.sub.2 Cl 155.247 CF.sub.3 CH.sub.3 COC.sub.2 H.sub.5 164.648 CF.sub.3 CH.sub.3 COC.sub.3 H.sub.7 111.049 CF.sub.3 CH.sub.3 COCH.sub.2 C.sub.6 H.sub.5 126.450 CF.sub.3 C.sub.2 H.sub.5 COCH.sub.3 87.851 CF.sub.3 C.sub.2 H.sub.5 COC.sub.2 H.sub.5 117.552 CF.sub.3 C.sub.2 H.sub.5 CO(n)C.sub.3 H.sub.7 119.053 CF.sub.3 C.sub.2 H.sub.5 CO(i)C.sub.3 H.sub.7 96.654 CF.sub.3 CH.sub.3 COCF.sub.3 128.155 CF.sub.3 C.sub.2 H.sub.5 COCF.sub.3 92.056 CF.sub.3 Br COCF.sub.3 113.257 CF.sub.3 CH.sub.3 COC.sub.2 F.sub.5 98.558 CF.sub.3 C.sub.2 H.sub.5 COC.sub.2 F.sub.5 94.159 CF.sub.3 CH.sub.3 COC.sub.3 F.sub.7 61.760 CF.sub.3 O CH.sub.3 COCH.sub.3 150.861 CF.sub.3 O CH.sub.3 COCF.sub. 3 104.762 CF.sub.3 C.sub.2 H.sub.5 ##STR31## 98.363 CF.sub.2 CH.sub.3 COCHF.sub.2 117.964 CF.sub.3 CH.sub.3 COCH.sub.2 F 135.765 CF.sub.3 C.sub.2 H.sub.5 COCHF.sub.2 96.3______________________________________

Practical embodiments for preparation of various starting compounds and intermediates are shown in the following examples.

Compound (III):

PREPARATION EXAMPLE 8

A mixture of 3-trifluoromethylaniline (30 g) and propargyl bromide (12 g) was stirred at 80.degree. C. for 3 hours, followed by filtration of the reaction mixture. The filtrate was subjected to column chromatography to give N-propargyl-3-trifluoromethylaniline (7 g). A solution of N-propargyl-3-trifluoromethylaniline thus obtained (5.1 g) and ethoxycarbonyl isothiocyalate (3.7 g) in tetrahydrofuran (100 ml) was stirred at room temperature for 8 hours, and the solvent was removed under reduced pressure. The concentrated residue was extracted with chloroform (200 ml), washed with water and dried over anhydrous magnesium sulfate. After removal of the solvent, the residue was subjected to column chromatography to give 5.7 g of 2-ethoxycarbonylimino- 3-(3-trifluoromethylphenyl)-5-methylenethiazolidine (Compound (i)).

PREPARATION EXAMPLE 9

A solution of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl)-5-bromomethylthiazolidine (0.7 g) and potassium t-butoxide (0.25 g) in t-butanol (30 ml) was refluxed for 5 hours, and the solvent was distilled off under reduced pressure. The residue was extracted with chloroform (100 ml), washed with water and dried over anhydrous magnesium sulfate. After removal of the solvent, the residue was subjected to column chromatography to give 0.25 g of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl)-5-methylenethiazolidine (Compound (i)).

PREPARATION EXAMPLE 10

A solution of 2-imino-3-(3-trifluoromethylphenyl)-5-methylenethiazoline (0.5 g), triethylamine (0.3 g) and ethyl chlorocarbonate (0.5 g) in tetrahydrofuran (30 ml) was stirred at room temperature for 24 hours, followed by removal of the solvent under reduced pressure. The residue was extracted with ethyl acetate (100 ml), washed with water and dried over anhydrous magnesium sulfate. After removal of the solvent, the residue was subjected to column chromatography to give 0.2 g of 2-ethoxycarbonylimino-3(3-trifluoromethylphenyl)-5-methylenethiazoline (Compound (i)).

In the same manner as above, the compounds (III) as shown in Table 7 were obtained.

TABLE 7______________________________________ ##STR32## (III)Compound MeltingNo. R.sup.1 R.sup.4 R.sup.5 point (.degree.C.)______________________________________i CF.sub.3 H OC.sub.2 H.sub.5 97.2ii CF.sub.3 CH.sub.3 OC.sub.2 H.sub.5 137.2iii CF.sub.3 CH.sub.3 O(i)C.sub.3 H.sub.7 128.9iv CF.sub.3 H ##STR33## 129.9v CF.sub.3 H CH.sub.2 C(CH.sub.3).sub.3 103.2vi CF.sub.3 H (i)C.sub.3 H.sub.7 97.8vii CF.sub.3 H OC.sub.6 H.sub.5 133.5viii CF.sub.3 H CH.sub.2 CH.sub.2 Cl 74.2______________________________________

Compound (XI):

PREPARATION EXAMPLE 11

To a solution of N-cyano-3-trifluoromethylaniline (5.0 g) in acetone (100 ml), potassium carbonate (7.4 g) and propargyl bromide (3.5 g) were added, and the resultant mixture was stirred at room temperature for 10 hours, followed by filtration of the reaction mixture. The solvent was removed from the filtrate by distillation under reduced pressure, and the residue was subjected to column chromatography to give N-cyano-N-propargyl-3-trifluoromethylaniline (3.8 g). The thus obtained N-cyano-N-propargyl-3-trifluoromethylaniline (1 g) and a catalytic amount of triethylamine were dissolved in methanol (30 ml), and the resultant mixture was cooled to 0.degree. C. Hydrogen sulfide was gradually introduced into the mixture for 20 minutes while keeping the temperature at 0.degree. C., followed by introduction of nitrogen gas to remove hydrogen sulfide. The solvent was removed by distillation, and the residue was subjected to column chromatography to give 0.2 g of 2-imino-3-(3-trifluoromethylphenyl)-5-methylenethiazolidine (Compound (ix)).

In the same manner as above, the compound (XI) as shown in Table 8 was obtained.

TABLE 8______________________________________ ##STR34## (XI)Compound No. R.sup.1 R.sup.4 .sup.1 H-NMR (.delta.)______________________________________ix CF.sub.3 H 7.2-7.9(4H), 6.4(1H), 5.0-5.2(2H), 4.7(2H)______________________________________

Compound (IV):

PREPARATION EXAMPLE 12

A mixture of 2-(t-butoxycarbonylimino)-3-(3-trifluoromethylphenyl)-5-ethylthiazoline (1 g) and trifluoroacetic acid (3 g) in chloroform (20 ml) was stirred at room temperature for 3 hours, followed by addition of water (50 ml) thereto. The resultant mixture was neutralized with potassium carbonate, extracted with chloroform and dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure, and the residue was subjected to column chromatography to give 0.3 g of 2-imino-3-(3-trifluoromethylphenyl)-5-ethylthiazoline (Compound (x)).

PREPARATION EXAMPLE 13

A mixture of 2-(acetylimino)-3-(3-trifluoromethylphenyl)-5-methylthiazoline (1 g) and hydrochloric acid (38%, 4 ml) in ethanol-water (1 : 2, 15 ml) was refluxed for 3 hours. Ethanol was removed by distillation under reduced pressure, and the residue was neutralized with potassium carbonate, extracted with ethyl acetate and dried over anhydrous magnesium sulfate. The solvenet was removed by distillation under reduced pressure to give 0.4 g of 2-imino-3-(3-trifluoromethylphenyl)-5-methylthiazoline (Compound (xi)).

In the same manner as above, the compound (IV) as shown in Table 9 was obtained.

TABLE 9______________________________________ ##STR35## (IV)Compound No. R.sup.1 R.sup.4 .sup.1 H-NMR (.delta.)______________________________________x CF.sub.3 CH.sub.3 7.5-7.9(4H), 6.4(1H), 5.3(1H), 2.5(q. 2H), 1.25(t, 3H)xi CF.sub.3 H 7.4-7.9(5H), 6.4(1H), 2.1(3H)______________________________________

Compound (VIII):

PREPARATION EXAMPLE 14

A solution of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl)-5-bromothiazoline (4.7 g), tributyltin hydride (6.9 g) and a catalytic amount of benzoyl peroxide in tetrahydrofuran (100 ml) was refluxed for 10 hours. The solvent was removed by distillation, and the residue was washed with hexane. Recrystallization from a mixture of hexane and ethanol gave 2.85 g of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl)thiazoline (Compound (xii)).

In the same manner as above, the compound (VIII) as shown in Table 10 was obtained.

TABLE 10______________________________________ ##STR36## (VIII)Compound No. R.sup.7 R.sup.8 Melting point (.degree.C.)______________________________________xii CF.sub.3 OC.sub.2 H.sub.5 134.5______________________________________

Compound (II):

Reference Example 1

A solution of N-allyl-3-trifluoromethylanilien (3 g) and ethoxycarbonyl isothiocyanate (2.1 g) in chloroform (50 ml) was stirred at room temperature for 3 hours, followed by removal of the solvent. The residue was subjected to column chromatography to give N-allyl-N-(3-trifluoromethylphenyl)-N'-ethoxycarbonylthiourea (3.5 g). The thus obtained thiourea (1 g) and N-bromosuccinimide (0.6 g) were dissolved in chloroform (50 ml), and the solution was stirred at room temperature for 6 hours. The solvent was removed by distillation, and the residue was extracted with ethyl ether. The extract was washed with an aqueous sodium sulfite solution and an aqueous sodium hydroxide solution in order, dried over anhydrous magnesium sulfate and concentrated under reduced pressure to give 1.2 g of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl)-5-bromomethylthiazolidine. m.p., 108.3.degree. C.

Reference Example 2

A solution of N-crotyl-N-(3-trifluoromethylphenyl)-N'-ethoxycarbonylthiourea (6 g) and sodium methoxide (28% methanolic solution; 6.6 g) in methanol (100 ml) was refluxed for 2 days. After removal of the solvent, the residue was extracted with chloroform, washed with water and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure, and the residue was subjected to column chromatography to give N-crotyl-N-(3-trifluoromethylphenyl)thiourea (2.4 g). The thus obtained thiourea (2.0 g) and N-bromosuccinimide (1.4 g) were dissolved in chloroform (50 ml), and the resultant solution was stirred at room temperature for 5 hours, washed with an aqueous sodium sulfite solution and dried over anhydrous magnesium sulfate. After removal of the solvent by distillation under reduced pressure, the residue was subjected to column chromatography to give 0.8 g of 2-imino-3-(3-trifluoromethylphenyl)-5-(1-bromoethyl)thiazolidine.

The above obtained 2-imino-3-(3-trifluoromethylphenyl)-5-(1-bromoethyl)thiazolidine (0.8 g) and triethylamine (1 g) were dissolved in tetrahydrofuran (50 ml), followed by dropwise addition of isopropyl chlorocarbonate (0.5 g). The resultant mixture was stirred at room temperature for 3 hours. The solvent was removed by distillation under reduced pressure. The residue was extracted with chloroform, washed with water and dried over anhydrous magnesium sulfate. After removal of the solvent, the residue was subjected to column chromatography to give 0.1 g of 2-isopropyloxycarbonylimino-3-(3-trifluoromethylphenyl)-5-(1-bromoethyl)thiazolidine.

Compound (VI):

Reference Example 3

To a solution of 2-phenoxycarbonylimino-3-(3-trifluoromethylphenyl)-5-methylenethiazolidine (0.5 g) in diethyl ether (30 ml), 70% ethylamine (10 ml) was added, and the resultant mixture was stirred at room temperature for 5 hours. The reaction mixture was extracted with diethyl ether. The extract was washed with water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was subjected to column chromatography to give 0.23 g of 2-(N-ethylcarbamoyl)-3-(3-trifluoromethylphenyl)-5-methylenethiazolidine. m.p., 118.5.degree. C.

Compound (VII):

Reference Example 4

A solution of N-(3-trifluoromethylphenyl)thiourea (6.1 g), dibromoethane (5.7 g) and anhydrous potassium carbonate (11.5 g) in acetone (60 ml) was refluxed for 1 day. The solvent was removed by distillation therefrom, and the residue was extracted with ethyl ether, washed with water, dried over anhydrous magnesium sulfate and subjected to column chromatography to give 7.5 g of 2-imino-3-(3-trifluoromethylphenyl)thiazolidine. The thus obtained 2-imino-3- (3-trifluoromethylphenyl) thiazolidine (1.0 g), n-butyl chlorocarbonate (0.61 g) and triethylamine (1.2 g) were dissolved in tetrahydrofuran, and the resultant solution was stirred at room teperature for 5 hours. The solvent was removed, and the residue was extracted with ethyl acetate, washed with water and dried over anhydrous magnesium sulfate. After removal of the solvent, the residue was subjected to column chromatography to give 0.57 g of 2-butoxycarbonylimino-3-(3-trifluoromethylphenyl)thiazolidine.

Reference Example 5

A solution of N-(3-trifluoromethylphenyl)-N'-ethoxycarbonylthiourea (1.8 g), dibromoethane (1.29 g) and anhydrous potassium carbonate (2.6 g) in acetone (20 ml) was refluxed for 5 hours. The solvent was removed by distillation, and the residue was extracted with diethyl ether. The extract was washed with water, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was recrystallized from a mixture of hexane and ethanol to give 1.63 g of 2-ethoxycarbonylimino-3-(3-trifluoromethylphenyl)thiazolidine. m.p., 75.8.degree. C.

Practical embodiments of the herbicidal composition according to the invention are illustratively shown below wherein parts are by weight. The compound number of the active ingredient corresponds to the one in Table 6.

Formulation Example 1

Fifty parts of any one of Compound Nos. 1 to 65, 3 parts of calcium ligninsulfonate, 2 parts of sodium laurylsulfate and 45 parts of synthetic hydrous silica are well mixed while being powdered to obtain wettable powder.

Formulation Example 2

Five parts of any one of Compound No. 1 to 65, 15 parts of "Toxanone P8L.RTM." (a commercial surface active agent; Sanyo Kasei K.K.) and 80 parts of cyclohexanone are well mixed to obtain emulsifiable concentrate.

Formulation Example 3

Two parts of any one of Compound No. 1 to 65, 1 part of synthetic hydrous silica, 2 parts of calcium ligninsulfonate, 30 parts of bentonite and 65 parts of kaolin clay are well mixed while being powdered. The mixture is then kneaded with water, granulated and dried to obtain granules.

Formulation Example 4

Twenty-five parts of any one of Compound No. 1 to 65 are mixed with 3 parts of polyoxyethylene sorbitan monooleate, 3 parts of carboxymethyl cellulose (CMC) and 69 parts of water and pulverized until the particle size of the mixture becomes less than 5 microns to obtain a suspension.

The biological data of the iminothiazoline compound (I) as the herbicide will be illustratively shown in the following Test Examples wherein the phytotoxicity to crop plants and the herbicidal activity on weeds were observed visually as to the degree of germination as well as the growth inhibition and rated with an index 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, the numeral "0" indicating no material difference as seen in comparison with the untreated plants and the numeral "10" indicating the complete inhibition or death of the test plants. The compound number in the biological data corresponds to the one in Table 6.

The compounds as shown in Table 11 were used for comparison.

TABLE 11______________________________________Com-poundNo. Structure Remarks______________________________________(A) ##STR37## Benthiocarb (commercial herbicide)(B) ##STR38## EP-A-0349282(C) ##STR39## EP-A-0349282(D) ##STR40## EP-A-0349282(E) ##STR41## EP-A-0349282(F) ##STR42## EP-A-0349282(G) ##STR43## EP-A-0349282(H) ##STR44## EP-A-0349282(I) ##STR45## EP-A-0349282(J) ##STR46## EP-A-0349282______________________________________

Test Example 1

Cylindrical plastic pots (diameter, 10 cm; height, 10 cm) were filled with upland field soil, and the seeds of japanese millet, tall morningglory and velvetleaf were sowed therein and covered with soil. A designated amount of the test compound formulated in an emulsifiable concentrate as in Formulation Example 2 was diluted with water; and the dilution was sprayed onto the soil surface by means of a small hand sprayer at a spray volume of 1,000 liters per hectare. The test plants were grown in a greenhouse for 20 days, and the herbicidal activity was examined. The results are shown in Table 12.

TABLE 12______________________________________ Herbicidal activity TallCompound Dosage Japanese morning- Velvet-No. (g/ha) millet glory leaf______________________________________1 2000 9 9 10 500 9 7 92 2000 9 10 10 500 7 7 73 2000 10 9 10 500 9 7 84 2000 10 10 10 500 10 10 10 125 10 10 85 2000 10 10 10 500 9 10 8 125 8 9 --6 2000 10 10 10 500 10 10 --7 2000 9 10 10 500 9 8 --8 2000 8 9 -- 500 7 8 --9 2000 10 10 10 500 10 10 --10 2000 10 10 10 500 10 7 --11 2000 10 10 9 500 10 9 --12 2000 10 10 10 500 10 7 813 2000 10 10 1014 2000 9 9 1015 2000 10 9 1016 2000 10 10 9 500 10 10 917 2000 10 10 10 500 10 10 --18 2000 10 10 10 500 9 9 --19 2000 10 9 7 500 10 8 --20 2000 10 10 10 500 10 10 1021 2000 10 10 -- 500 10 10 --22 2000 10 10 -- 500 10 7 --23 2000 10 10 10 500 10 9 1024 2000 10 9 -- 500 10 9 --25 2000 10 10 10 500 10 9 9 125 9 9 826 2000 10 10 10 500 10 10 10 125 9 9 827 2000 10 10 -- 500 9 9 --28 2000 10 10 8 500 10 10 729 2000 10 10 8 500 10 9 730 2000 9 10 10 500 9 -- 1031 2000 9 7 8 500 9 -- 732 2000 7 7 933 2000 9 10 9 500 9 10 734 2000 10 10 10 500 9 8 1035 2000 10 10 --36 2000 9 10 7 500 7 8 --40 2000 -- 10 1041 2000 10 10 10 500 10 10 10 125 7 8 742 2000 9 10 10 500 8 9 1046 2000 10 10 9 500 10 7 747 2000 10 10 10 500 10 8 748 2000 10 10 10 500 10 10 --49 2000 9 10 10 500 9 10 950 2000 10 10 10 500 10 10 951 2000 10 10 10 500 10 10 952 2000 10 10 10 500 10 10 953 500 10 10 954 500 10 10 10 125 10 10 1055 500 10 10 10 125 10 10 1056 500 9 9 9 125 8 8 857 500 9 10 958 500 10 10 8 125 9 7 759 2000 7 9 960 500 10 10 1061 500 10 10 10 125 9 10 762 2000 10 10 963 500 10 10 10 125 10 10 1064 500 10 10 10 125 9 9 765 500 10 10 10 125 9 10 10A 2000 7 0 0 500 0 0 0B 2000 0 0 0C 2000 0 2 4 500 0 0 0D 2000 0 0 0E 2000 5 5 5 500 0 3 0F 2000 7 1 3 500 5 0 3______________________________________

Test Example 2

Cylindrical plastic pots (diameter, 10 cm; height, 10 cm) were filled with upland field soil, and the seeds of japanese millet, morningglory, radish and velvetleaf were sowed therein and cultivated in a greenhouse for 10 days. A designated amount of the test compound formulated in an emulsifiable concentrate as in Formulation Example 2 was diluted with water containing a spreading agent, and the dilution was sprayed over the foliage of the test plant by means of a small hand sprayer at a spray volume of 1,000 liters per hectare. The test plants were further grown in the greenhouse for 20 days, and the herbicidal activity was examined. The results are shown in Table 13.

TABLE 13______________________________________ Herbicidal activityCompound Dosage Japanese Morning- Velvet-No. (g/ha) millet glory Radish leaf______________________________________1 2000 9 9 10 9 500 9 9 10 82 2000 9 10 10 9 500 9 10 10 73 2000 9 10 10 10 500 9 9 10 --4 2000 10 10 10 10 500 9 10 10 10 125 8 10 10 75 2000 9 10 10 10 500 9 10 10 10 125 9 10 9 76 2000 9 10 10 10 500 9 10 10 8 125 9 10 10 77 2000 8 10 10 9 500 8 10 8 98 2000 -- 10 8 109 2000 9 10 10 8 500 8 10 10 --10 2000 9 10 10 9 500 9 10 10 --11 2000 9 10 10 10 500 9 10 10 812 2000 9 10 10 10 500 9 10 10 10 125 7 10 10 713 2000 9 10 10 10 500 9 10 10 9 125 7 9 10 714 2000 8 10 10 1015 2000 7 7 10 816 2000 9 10 10 9 500 9 10 10 817 2000 9 10 10 9 500 9 10 10 9 125 8 10 9 818 2000 9 10 10 10 500 9 10 10 10 125 7 9 10 1019 2000 9 10 7 720 2000 10 10 10 9 500 9 9 9 821 2000 9 10 10 10 500 9 10 9 10 125 9 9 8 1022 2000 9 10 10 8 500 9 10 10 723 2000 10 10 10 10 500 9 10 10 10 125 9 9 10 924 2000 10 10 10 9 500 9 10 10 8 125 9 9 10 825 2000 10 10 10 10 500 9 10 10 9 125 9 10 9 926 2000 9 10 10 10 500 9 10 10 10 125 9 10 10 1027 2000 10 10 10 10 500 9 10 10 9 125 7 10 10 928 2000 10 10 10 9 500 9 10 9 9 125 9 10 9 829 2000 9 10 10 9 500 9 10 9 9 125 8 10 9 730 2000 9 9 10 9 500 9 9 10 9 125 9 9 10 831 2000 10 10 10 10 500 10 10 10 10 125 9 10 10 1032 2000 -- 9 -- 833 2000 9 10 10 10 500 9 10 10 10 125 9 10 10 934 2000 9 10 10 10 500 9 9 10 10 125 9 9 10 1035 2000 9 10 10 9 500 9 10 10 8 125 8 10 10 836 2000 9 10 10 10 500 9 10 10 10 125 7 10 10 1038 2000 -- 8 10 939 2000 -- 9 7 --41 2000 10 10 10 10 500 9 10 10 10 125 9 10 10 1042 2000 10 10 10 10 500 -- 10 10 1043 2000 -- 10 10 10 500 -- 10 10 1044 2000 -- 9 7 --45 2000 -- 10 10 846 2000 9 9 9 9 500 9 9 9 947 2000 9 10 10 9 500 9 10 10 948 2000 9 10 10 9 500 9 10 10 9 125 9 10 10 749 2000 9 10 10 9 500 8 10 10 9 125 7 10 10 950 2000 10 10 10 9 500 10 10 10 951 2000 10 10 10 10 500 10 10 10 952 2000 10 10 10 10 500 10 10 10 953 500 10 10 10 954 500 9 10 10 9 125 9 10 10 955 500 10 10 10 10 125 10 10 10 1056 500 9 10 10 9 125 7 10 9 957 500 9 10 10 9 125 9 10 10 958 500 9 10 10 9 125 8 10 10 959 2000 8 10 10 960 500 9 9 9 761 500 9 9 9 10 125 9 9 9 1062 500 9 10 10 10 125 9 10 10 963 500 9 10 10 10 125 9 10 10 1064 500 9 10 10 10 125 7 10 9 765 500 10 9 10 10 125 10 9 10 10A 2000 9 2 1 0 500 3 1 0 0B 2000 1 3 0 0 500 0 1 0 0C 2000 3 6 3 4 500 0 6 0 1D 2000 0 2 1 0 500 0 1 0 0E 2000 3 6 2 1 500 0 3 1 0F 2000 6 2 5 4 500 1 0 2 0______________________________________

Test Example 3

Cylindrical plastic pots (diameter, 8 cm; height, 12 cm) were filled with paddy field soil, and the seeds of barnyardgrass (Echinochloa oryzicola) and hardstem bulrush (Scirpus juncoides) were sowed in 1 to 2 cm depth. Water was poured therein to make a flooded condition, and rice seedlings of 2-leaf stage were transplanted therein, and the test plants were grown in a greenhouse. Six days (at that time seeds began to germinate) thereafter, a designated amount of the test compound formulated in an emulsifiable concentrate as in Formulation Example 2 and diluted with water (2.5 ml) was applied to the pots by perfusion. The test plants were grown for an additional 19 days in the greenhouse, and the herbicidal activity and phytotoxicity were examined. The results are shown in Table 14.

TABLE 14______________________________________ Herbicidal activityCompound Dosage Phytotoxicity Barnyard- HardstemNo. (g/ha) Rice plant grass bulrush______________________________________1 63 1 8 72 250 1 10 9 63 1 10 --4 63 1 9 85 63 1 10 8 16 1 10 86 63 1 8 --7 63 1 10 8 16 1 9 --8 63 1 9 --9 63 1 9 910 63 1 10 711 63 1 8 --12 16 1 10 813 63 1 9 714 63 1 7 815 250 1 10 9 63 0 7 --16 63 1 10 717 63 1 10 918 63 1 9 --19 250 1 10 10 63 0 9 820 63 1 10 --21 63 1 10 -- 16 1 10 722 63 1 10 8 16 1 10 723 63 1 10 924 63 1 9 9 16 0 8 925 63 1 9 926 63 1 10 9 16 1 9 927 63 1 10 --28 63 1 8 830 250 0 10 10 63 0 9 831 250 0 9 9 63 0 9 833 63 1 9 734 63 1 9 835 250 1 9 936 250 1 10 941 250 1 10 942 63 1 9 843 250 1 9 --46 63 1 9 9 16 0 9 748 63 1 10 10 16 1 9 949 63 1 9 8 16 0 8 751 63 1 10 854 16 0 10 755 16 1 10 --57 63 1 10 758 63 1 10 762 63 1 8 --63 16 0 9 864 250 1 10 965 16 1 8 8A 250 0 7 3 63 0 2 0 16 0 0 0B 250 0 0 0C 250 0 0 0D 250 0 0 0E 250 0 0 0F 250 0 1 1______________________________________

Test Example 4

Vats (33 cm.times.23 cm.times.11 cm) were filled with upland field soil, and the seeds of catchweed bedstraw, common chickweed, persian speedwell, field pansy and wheat were sowed therein in 1 to 2 cm depth. A designated amount of the test compound formulated in a wettable powder as in Formulation Example 1 was diluted with water, and the dilution was sprayed onto the soil surface by means of a small hand sprayer at a spray volume of 1,000 liters per hectare. The test plants were grown in a greenhouse for 20 days, and the herbicidal activity and phytotoxicity were examined. The results are shown in Table 15.

TABLE 15______________________________________ Herbicidal activityCom- Phyto- Catch- Common Persianpound Dosage toxicity weed chick- speed- FieldNo. (g/ha) Wheat bedstraw weed well pansy______________________________________1 500 0 9 10 10 102 500 0 8 10 10 --4 500 1 9 10 10 1030 2000 0 9 10 10 1031 2000 1 9 10 10 1033 2000 0 9 10 10 10 500 0 7 10 10 1034 500 0 9 10 10 1035 500 0 7 10 10 1036 500 1 7 10 10 1046 125 0 9 8 10 852 500 1 7 10 10 8A 2000 0 0 0 10 10G 2000 0 0 3 10 2 500 0 0 0 8 0______________________________________

Test Example 5

vats (33 cm.times.23 cm.times.11 cm) were filled with upland field soil, and the seeds of common chickweed, persian speedwell, blackgrass, annual bluegrass, wheat and barley were sowed therein in 1 to 2 cm depth. A designated amount of the test compound formulation in an emulsifiable concentrate as in Formulation Example 2 was diluted with water, and the dilution was sprayed onto the soil surface by means of an automatic sprayer at a spray volume of 1,000 liters per hectare. The test plants were grown in a greenhouse for 25 days, and the herbicidal activity and phytotoxicity were examined. The results are shown in Table 16.

TABLE 16__________________________________________________________________________ Herbicidal activityCom- Phyto- Common Persian Annualpound Dosage toxicity chick- speed- Black- blue-No. (g/ha) Wheat Barley weed well grass grass__________________________________________________________________________3 125 0 1 10 10 8 94 500 1 1 10 10 10 10 125 0 0 10 10 9 105 125 0 1 10 10 9 106 125 0 1 10 10 9 --7 500 0 1 10 10 10 10 125 0 0 10 8 7 99 125 -- 1 10 10 7 1010 125 -- 0 10 10 10 1012 125 0 1 9 7 7 814 500 1 1 10 10 7 1017 500 0 1 10 10 10 10 125 0 0 9 10 8 1020 500 -- 0 10 10 10 10 125 1 0 -- 10 7 821 500 0 -- 10 10 10 10 125 0 0 10 10 9 1022 500 0 1 7 10 -- 10 125 0 0 7 10 -- 823 125 0 0 10 10 9 1024 125 0 1 -- 10 9 1026 500 0 -- 9 10 9 10 125 0 0 -- 10 8 1028 125 0 0 7 10 8 1030 500 0 -- 10 10 10 10 125 0 0 10 10 -- 833 500 1 -- 10 10 9 9 125 0 1 10 10 8 935 125 0 -- 9 10 10 941 500 0 -- 10 10 10 10 125 0 1 9 10 10 10G 125 0 0 0 6 0 0H 500 0 0 1 5 2 0 125 0 0 0 5 0 0I 125 0 0 6 6 2 4J 125 0 0 0 6 0 0__________________________________________________________________________

Test Example 6

Vats (33 cm.times.23 cm.times.11 cm) were filled with upland field soil, and the seeds of soybean, cotton, corn, rice plant, velvetleaf and green foxtail were sowed 1 to 2 cm depth. A designated amount of the test compound formulated in a wettable powder as in Formulation Example 1 was diluted with water, and the dilution was sprayed onto the soil surface by means of a small hand sprayer at a spray volume of 1000 liters per hectare. The test plants were grown in a greenhouse for 20 days, and the herbicidal activity and phytotoxicity were examined. The results are shown in Table 17.

TABLE 17______________________________________ Phytotoxicity Herbicidal activityCom-pound Dosage Soy- Rice Velvet- GreenNo. (g/ha) bean Cotton Corn plant leaf foxtail______________________________________30 500 1 0 0 0 9 10A 500 1 0 1 1 0 6G 500 0 0 0 0 0 0______________________________________

Test Example 7

Vats (33 cm.times.23 cm.times.11 cm) were filled with upland field soil, and the seeds of cotton, black nightshade, johnsongrass, green foxtail were sowed therein 1 to 2 cm depth. A designated amount of the test compound formulated in an emulsifiable concentrate as in Formulation Example 2 was diluted with water, and the dilution was sprayed onto the soil surface by means of a small hand sprayer at a spray volume of 1,000 liters per hectare. The test plants were grown in a greenhouse for 20 days, and the herbicidal activity and phytotoxicity were examined. The results are shown in Table 18.

TABLE 18______________________________________ Herbicidal activity Phyto- Black Barn- GreenCompound Dosage toxicity night- yard- fox-No. (g/ha) Cotton shade grass tail______________________________________1 500 0 10 9 102 500 0 10 -- 103 500 0 10 8 104 500 0 10 10 105 500 1 10 10 106 500 0 10 10 107 500 1 10 10 98 500 0 -- 7 99 500 0 10 10 910 500 0 10 10 1011 500 0 10 10 1012 500 1 10 7 1013 500 0 10 10 1014 500 0 10 8 1017 500 1 9 10 1018 500 0 9 9 919 500 1 8 7 920 500 0 9 10 921 500 0 8 10 923 500 0 9 10 925 500 1 7 10 1026 500 1 7 10 929 500 0 10 10 930 500 0 9 10 1031 500 1 10 9 1033 500 1 -- 10 1034 500 0 10 9 1046 500 0 10 9 1048 500 1 10 10 949 500 1 10 8 1050 500 0 10 10 851 500 0 9 10 1052 500 0 9 10 1053 500 0 9 10 10 125 0 8 10 1054 500 1 10 10 10 125 0 9 10 1055 125 0 10 9 1057 500 1 10 10 1058 125 0 10 7 962 500 0 10 8 963 500 1 10 10 10 125 0 10 9 1064 500 0 10 10 10 125 0 10 8 10A 500 0 0 6 6G 500 0 0 0 0H 500 0 1 1 1I 500 1 0 2 --J 500 0 0 1 4______________________________________

Test Example 8

Vats (33 cm.times.23cm.times.11 cm) were filled with upland field soil, and the seeds of soybean, corn, rice plant and barnyardgrass were sowed therein 1 to 2 cm depth. A designated amount of the test compound formulated in an emulsifiable concentrate as in Formulation Example 2 was diluted with water, and the dilution was sprayed onto the soil surface by means of a small hand sprayer at a spray volume of 1,000 liters per hectare. The test plants were grown in a greenhouse for 20 days, and the herbicidal activity and phytotoxicity were examined. The results are shown in Table 19.

TABLE 19______________________________________ Herbicidal Phytotoxicity activityCompound Dosage Rice Barnyard-No. (g/ha) Soybean Corn plant grass______________________________________1 500 1 -- 1 93 500 -- -- 1 84 125 0 0 1 105 125 0 1 0 96 125 1 -- 1 97 500 -- 1 1 108 500 0 0 0 79 500 1 0 1 1010 125 0 0 0 811 125 0 1 1 913 500 0 1 0 1017 125 0 1 1 918 125 0 0 1 719 500 0 0 1 720 125 0 1 -- 1021 125 0 1 -- 930 500 1 0 0 1031 500 0 -- 1 933 125 0 1 1 934 500 1 1 1 935 250 1 1 1 936 500 1 1 1 941 125 1 0 1 946 125 -- 1 1 9A 500 1 1 1 6G 500 0 0 0 0H 500 0 0 0 1I 500 0 1 0 2J 500 0 1 0 1______________________________________

Test Example 9

Vats (33 cm.times.23 cm.times.11 cm) were filled with upland field soil, and the seeds of cotton, morningglory and johnsongrass were sowed therein 1 to 2 cm depth. A designated amount of the test compound formulated in an emulsifiable concentrate as in Formulation Example 2 was diluted with water, and the dilution was sprayed onto the soil surface by means of a small hand sprayer at a spray volume of 1,000 liters per hectare. The test plants were grown in a greenhouse for 20 days, and the herbicidal activity and phytotoxicity were examined. The results are shown in Table 20.

TABLE 20______________________________________ Phyto- Herbicidal activityCompound Dosage toxicity Morning- Johnson-No. (g/ha) Cotton glory grass______________________________________3 500 0 -- 84 500 0 10 95 500 1 10 96 500 0 9 107 500 1 10 79 500 0 10 710 500 0 7 911 500 0 9 1012 500 1 -- 713 500 0 -- 814 500 0 7 --17 500 1 7 1018 500 0 -- 1020 500 0 10 1021 500 0 7 923 500 0 -- 925 500 1 10 726 500 1 10 929 500 0 7 933 500 1 8 946 500 0 7 748 500 1 10 1049 500 1 8 1052 500 0 8 1053 500 0 10 10 125 0 10 854 500 1 10 10 125 0 10 955 500 1 10 10 125 0 7 862 500 0 7 863 500 1 10 10 125 0 10 1064 500 0 10 10A 500 0 0 0G 500 0 0 0H 500 0 1 1I 500 1 3 3J 500 0 0 0______________________________________

Test Example 10

Wagner's pots (1/5000 are) were filled with paddy field soil, and the seeds of barnyardgrass (Echinochloa oryzicola), broad-leaved weeds (i.e. common falsepimpernel, indian toothcup, waterwort) and hardstem bulrush were sowed in 1 to 2 cm depth. Water was poured therein to make a flooded condition, and rice seedling of 3-leaf stage were transplanted therein, and the test plants were grown in a greenhouse. Five days (at that time barnyardgrass began to germinate) thereafter, a designated amount of the test compound formulated in an emulsifiable concentrate as in Formulation Example 2 and diluted with water (10 ml) was applied to the pots by perfusion. The test plants were grown for an additional 19 days in the greenhouse, and the herbicidal activity and phytotoxicity were examined. The results are shown in Table 21. At the time of the treatment, the depth of water in the pots was kept at 4 cm and following two days, water was let leak a volume corresponding to a 3 cm depth per day.

TABLE 21______________________________________ Herbicidal activityCom- Phyto- Broad-pound Dosage toxicity Barnyard- leaved HardstemNo. (g/ha) Rice plant grass weed bulrush______________________________________1 250 0 10 10 10 63 0 9 10 92 250 0 10 10 10 63 0 8 10 8 16 0 8 8 --3 250 1 10 10 10 63 0 9 10 --4 16 1 10 10 95 63 1 10 10 10 16 0 10 9 76 16 1 10 10 --7 63 1 10 10 10 16 0 -- 8 108 250 1 10 10 10 63 0 8 10 79 63 0 7 10 810 63 1 10 10 717 16 0 9 8 919 63 0 8 9 820 16 0 7 8 --21 63 1 9 10 10 16 1 10 10 722 63 1 10 10 10 16 0 10 10 730 250 1 10 10 10 63 0 10 10 831 250 0 10 10 1033 63 1 10 10 836 63 1 10 10 --42 250 0 8 10 1046 63 1 10 10 853 16 0 10 10 762 63 1 10 9 9A 250 0 7 0 6 63 0 0 0 0G 250 0 0 0 0H 250 0 0 0 0______________________________________

Test Example 11

Wagner's pots (1/5000 are) were filled with paddy field soil, and the seeds of barnyardgrass (Echinochloa oryzicola) and broad-leaved weeds (i.e. common false-pimpernel, indian toothcup, waterwort, Ammannia multiflora) were sowed in 1 to 2 cm depth. Water was poured therein to make a flooded condition, and rice seedling of 2-leaf stage were transplanted therein, and the test plants were grown in a greenhouse. Eleven days (at that time barnyardgrass grows to the 2-leaf stage) thereafter, a designated amount of the test compound formulated in an emulsifiable concentrate as in Formulation Example 2 and diluted with water (10 ml) was applied to the pots by perfusion. The test plants were grown for an additional 20 days in the greenhouse, and the herbicidal activity and phytotoxicity were examined. The results are shown in Table 22. At the time of the treatment, the depth of water in the pots was kept at 4 cm and following two days, water was let leak a volume corresponding to a 3 cm depth per day.

TABLE 22______________________________________Com- Phyto- Herbicidal activitypound Dosage toxicity Barnyard- Broad-leavedNo. (g/ha) Rice plant grass weed______________________________________2 250 0 8 84 63 1 10 95 250 1 10 8 63 0 9 86 63 1 9 1017 63 0 10 1018 250 1 10 820 63 1 9 821 250 1 10 10 63 1 9 1022 250 1 10 10 63 0 9 1033 63 0 10 755 63 1 8 9G 250 0 0 0H 250 0 2 0I 250 1 1 0______________________________________

Test Example 12

Vats (33 cm.times.23 cm.times.11 cm) were filled with upland field soil, and the seeds of rice plant, morningglory, common cocklebur, velvetleaf, black nightshade, barnyardgrass and green foxtail were sowed therein and cultivated for 18 days in a greenhouse. A designated amount of the test compound formulated in an emulsifiable concentrate as in Formulation Example 2 was diluted with water, and the dilution was sprayed over the foliage of the test plants by means of a small hand sprater at a spray volume of liters per hecare. The test plants were further grown in the greenhouse for 18 days, and the herbicidal activity and phytotoxicity were examined. At the time of the application, the test plants were generally at the 1 to 4 leaf stage and in 2 to 12 cm height, although the growing stage of the test plants varied depending on their species. The results are shown in Table 23.

TABLE 23__________________________________________________________________________ Herbicidal activity Black Barn-Compound Dosage Phytotoxicity Morning- Common Velvet- night- yard- GreenNo. (g/ha) Rice plant glory cocklebur leaf shade grass foxtail__________________________________________________________________________30 2000 0 9 9 9 9 9 9H 2000 3 0 0 1 5 4 5__________________________________________________________________________

Test Example 13

vats (33 cm.times.23 cm.times.11 cm) were filled with upland field soil, and the seeds of cotton, giant foxtail, large crabgrass, fall panicum, shattercane, green foxtail, bermudagrass, slender amaranth, prickly sida, black nightshade, morningglory and field bindweed were sowed in 1 to 2 cm depth. A designated amount of the test compound formulated in an emulsifiable concentrate as in Formulation Example 2 was diluted with water, and the dilution was sprayed onto the soil surface by means of a small hand sprayer at a spray volume of 230 liters per hectare. The test plants were grown outdoor for 21 days, and the herbicidal activity and phytotoxicity were examined. The results are shown in Table 24.

TABLE 24__________________________________________________________________________ Herbicidal activityCom- Phyto- Giant Large Green Black Fieldpound Dosage toxicity fox- crab- Fall Shatter- fox- Bermuda- Slender Prickly night- Morning- bind-No. (g/ha) Cotton tail grass panicum cane tail grass amaranth sida shade glory weed__________________________________________________________________________ 4 400 0 10 10 10 10 10 10 10 9 10 10 854 200 0 10 10 10 10 10 10 10 10 10 10 10F 400 0 0 0 0 0 0 0 0 0 0 0 0__________________________________________________________________________

Test Example 14

Vats (33 cm.times.23 cm.times.11 cm) were filled with upland field soil, and the seeds of wheat, persian speedwell and field pansy were sowed therein and cultivated for 31 days in a greenhouse. A designated amount of the test compound formulated in an emulsifiable concentrate as in Formulation Example 2 was diluted with water, and the dilution was sprayed over the foliage of the test plants by means of an automatic sprayer at a spray volume of 1,000 liters per hectare. The test plants were further grown in the greenhouse for 25 days, and the herbicidal activity and phytotoxicity were examined. At the time of the application, the test plants were generally at the 1 to 4 leaf stage and in 3 to 25 cm height, although the growing stage of the test plants varied depending on their species. The results are shown in Table 25.

TABLE 25______________________________________ Herbicidal activityCom- Phyto- Persianpound Dosage toxicity speed- FieldNo. (g/ha) Wheat well pansy______________________________________54 500 1 10 10 125 1 10 10J 500 1 4 5 125 0 2 4______________________________________

Test Example 15

Containers (40 cm.times.35 cm bed) were filled with upland field soil, and the seeds of soybean, yellow foxtail, johnsongrass, southern crabgrass, giant foxtail, velvetleaf, slender amaranth, black nightshade and jimsonweed were sowed in 1 to 3 cm depth. A designated amount of the test compound formulated in an emulsifiable concentrate as in Formulation Example 2 was diluted with-water, and the dilution was sprayed onto the soil surface by means of a small hand sprayer at a spray volume of 430 liters per hectare. The test plants were grown outdoor for 52 days, and the herbicidal activity and phytotoxicity were examined. The results are shown in Table 26.

TABLE 26__________________________________________________________________________ Herbicidal activityCom- Phyto- Yellow Southern Giant Blackpound Dosage toxicity fox- Johnson- crab- fox- Velvet- Slender night- Jimson-No. (g/ha) Soybean tail grass grass tail leaf amaranth shade weed__________________________________________________________________________54 100 0 10 10 10 10 10 10 10 9F 100 0 0 0 0 0 0 0 0 0__________________________________________________________________________

Claims

1. An iminothiazoline compound of the formula: ##STR47## wherein R.sup.7 is a halogen atom or a halogen-substituted C.sub.1 -C.sub.2 alkyl group and R.sup.8 is a C.sub.1 -C.sub.6 alkyl group, a C.sub.1 -C.sub.6 alkyloxy group, a C.sub.1 -C.sub.6 alkyloxy group substituted with C.sub.1 -C.sub.2 alkyloxy or phenyl, a phenyl group, a phenoxy group or a halogen-subsituted C.sub.1 -C.sub.6 alkyl group.

2. The iminothiazoline compound according to claim 1, wherein R.sup.7 is selected from the group consisting of CF.sub.3, CF.sub.3 CF.sub.2, F, Cl, and Br.

3. The iminothiazoline compound according to claim 1, wherein R.sup.8 is selected from the group consisting of OC.sub.2 H.sub.5, C.sub.2 H.sub.5, OCH.sub.3, CH.sub.3, OCH.sub.2 CH.sub.2 CH.sub.3, CH.sub.2 CH.sub.2 CH.sub.3, ##STR48## and CF.sub.3.

4. The iminothiazoline compound according to claim 3, wherein R.sup.7 is selected from the group consisting of CF.sub.3, CF.sub.3 CF.sub.2, F, Cl, and Br.

5. The iminothiazoline compound according to claim 1, wherein R.sup.7 is CF.sub.3.

6. The iminothiazoline compound according to claim 5, wherein R.sup.8 is a C.sub.1 -C.sub.6 alkyloxy group, a phenyl group, or a phenoxy group.