申请人:Sumitomo Chemical Company, Limited
公开号:US04740612A1
公开(公告)日:1988-04-26
A novel process for producing a .beta.-dihalogenoethenylcyclopropane derivative of the formula, ##STR1## wherein R.sub.1 is a hydrogen atom or an alkyl group, R.sub.3 is a hydrogen atom, lower alkyl, acyl, carboxyl or alkoxycarbonyl group and R is a hydrogen atom or a lower alkyl group and each of Y.sub.1 and Y.sub.2 is a fluorine, chlorine or bromine atom respectively, which is an acidic moiety of the useful synthetic insecticides of the pyrethrin type, which process comprises a combination of a series of sequential steps starting from alkyl 3-butenyl ketone derivative of the formula (I), which may be shown according to the following reaction scheme: ##STR2## According to this process, objective compound of the formula (VI) having any cis/trans ratio can be produced by selecting the reaction condition of the Stages II-1, II-2, and IV-2.
一种生产β-二卤乙烯基环丙烷衍生物的新工艺,其化学式为:##STR1## 其中R.sub.1为氢原子或烷基,R.sub.3为氢原子、低烷基、酰基、羧基或烷氧羰基基团,R为氢原子或低烷基,Y.sub.1和Y.sub.2分别为氟、氯或溴原子,是拟除虫菊酯类有用合成杀虫剂的酸性基团。该工艺包括从化学式(I)的烷基3-丁烯酮衍生物开始的一系列顺序步骤组合,可以根据以下反应方程式来表示:##STR2## 根据该工艺,通过选择阶段II-1、II-2和IV-2的反应条件,可以生产具有任何顺反异构比的化合物(VI)。