2-CHLORO(OR 2,3-DICHLORO)-5-TRIFLUOROMETHYL PYRIDINE DERIVATIVES AND THEIR PREPARATION

摘要

Herbicidal pyridine compounds of the formulawherein Z and Y each represent a fluorine, chlorine, bromine, iodidine, or hydrogen atom, or a trifluoromethyl, difluoromethyl, or chlorodifluoromethyl radical. provided that at least one of Z and Y is a halogenomethyl radical; R¹ represents hydrogen or an alkyl radical of 1 to 4 carbon atoms; and R² is a cyano group; a carboxyl group; one of a specified range of carboxamide or alkoxycarbonyl groups; a cyclohexyloxycarbonyl radical optionally substituted by one or more halogen atoms or methyl radicals; an alkenyloxycarbonyl radical in which the alkenyl group contains from 3 to 6 carbon atoms; a phenoxycarbonyl radical optionally bearing one or more halogen or methyi substituents; or a benzyloxycarbonyl radical, the phenyl group of which optionally bears one or more halogen or methyl substituents; and in the case of compounds wherein R² is a carboxyl group, salts thereof. The compounds are useful as selective herbicides for grass weeds in broad-leaved crops, intermediates of formulawith Y = hydrogen or chlorine.