Neue herbicide Mittel

摘要

Thiazole derivatives of the general formula wherein R is cyclopropyl which may be substituted by one to three substituents selected from methyl, chloro-, methoxy or methyl thio, and X is Cl, Br or I, may be obtained by halogenation (by conventional means) of a 2-acylamino-thiazole compound of the formula where Z is hydrogen or a group -HgCl or -HgO.CO.CH3. They may also be obtained by acylation of a 2-amino-5-halogenothiazole of the formula by treatment with a compound of general formula (III) R.CO.Y where Y is halogen, hydroxy, alkoxy, alkylthio or a group R.CO.O-. Compounds of Formula II wherein Z is hydrogen may be obtained by reacting 2-amino-thiazole with a compound of Formula III; compounds of Formula II wherein Z is -HgCl or-Hg.O.CO.CH3 may be obtained by reacting the corresponding compound of Formula II wherein Z is hydrogen with mercuric chloride in water, mercuric acetate in water followed by treatment with an alkali metal chloride, or with mercuric acetate in acetic acid. Compounds of Formula IV may be obtained by hydrolysis of the corresponding 2-acetamido-5-halogenothiazole. Examples of compounds of Formula I are those wherein R is cyclopropyl-, 1-methyl-cyclopropyl- and 1-methoxy-cyclopropyl.ALSO:A herbicidal composition comprises a thiazole derivative of the formula: wherein R is a cyclopropyl which may be substituted by one to three substituents selected from methyl, chloro, methoxy and methylthio, and x is chlorine, bromine or iodine. The composition may also include a diluent or carrier which may be a liquid or solid, a surface active agent, e.g. a wetting, dispersing or emulsifying agent, and other conventional additives, e.g. adhesives, colouring agents and corrosion inhibitors. The compositions may also contain other herbicidally active compounds, e.g. phenoxyalkanoic acids, benzoic acid derivatives, halogenated aliphatic acids, carbamates, amides, urea derivatives, diazines, triazines, substituted phenols, quaternary ammonium derivatives, benzonitrile derivatives, triazoles and benzene sulphonyl carbamates; they may also be used to exercise a desiccant or defloliant effect on crops.