Herbicidal halogenomethyl--pyridyloxy-phenoxy-alkanecarboxylic acids and derivatives, and processes of controlling unwanted plants therewith
申请人:IMPERIAL CHEMICAL INDUSTRIES PLC
公开号:EP0001473A2
公开(公告)日:1979-04-18
Herbicidal pyridine compounds of the formula
wherein 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 formula
with Y = hydrogen or chlorine.
式中的除草吡啶化合物
其中 Z 和 Y 分别代表氟、氯、溴、碘、氢原子或三氟甲基、二氟甲基或氯二氟甲基基。条件是 Z 和 Y 中至少有一个是卤代甲基基;R1 代表氢或 1 至 4 个碳原子的烷基;R2 是氰基;羧基;指定范围的羧酰胺基或烷氧基羰基之一;任选被一个或多个卤原子或甲基基取代的环己氧羰基;烯氧羰基,其中烯基含有 3 至 6 个碳原子; 苯氧羰基,可选择带有一个或多个卤素或甲基取代基;或苄氧羰基,其中苯基可选择带有一个或多个卤素或甲基取代基;以及 R2 为羧基的化合物的盐。这些化合物可用作阔叶作物禾本科杂草的选择性除草剂,其中间体式为
其中 Y = 氢或氯。