申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0016505A1
公开(公告)日:1980-10-01
Process for the preparation of a dihalovinyl compounds of the general formula:
wherein R' represents an optionally-substituted cyclopropyl group or an optionally-substituted alkyl group, R2 a methyl group or a hydrogen atom or R' and R2, together with the carbon atom to which they are attached jointly form a cycloalkyl group, and each Hal stands for a chlorine or bromine atom, characterised in that a trihalomethyl compound of the general formula:
wherein R', R2 and Hal have the same meaning as in formula I and X represents a group -PQ2, -CO-OR or-SO2-R4 wherein Q represents a halogen atom and R3 and R4 both represent an optionally-substituted alkyl group, is contacted with zinc and an alkanoic acid with up to 5 carbon atoms per molecule: The dihalovinyl compounds are intermediates in the manufacture of pyrethroid insecticides.
通式如下的二卤乙烯基化合物的制备工艺
其中 R'代表任选取代的环丙基或任选取代的烷基,R2 代表甲基或氢原子或 R'和 R2 与它们所连接的碳原子共同形成环烷基,每个 Hal 代表一个氯原子或溴原子,其特征在于通式的三卤甲基化合物
其中 R'、R2 和 Hal 的含义与式 I 相同,X 代表基团-PQ2、-CO-OR 或-SO2-R4,其中 Q 代表卤素原子,R3 和 R4 均代表任选取代的烷基:二卤乙烯基化合物是生产拟除虫菊酯杀虫剂的中间体。