申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0016504A2
公开(公告)日:1980-10-01
Process for the preparation of novel trihalomethyl carbonates of the general formula:
wherein R1 represents an optionally-substituted cyclopropyl or an optionally-substituted alkyl group, R1 a methyl group or a hydrogen atom or R1 and R2, together with the carbon atom to which they are attached jointly form a cycloalkyl group, each Hal is a chlorine or bromine atom and M represents an alkali metal atom, wherein a carbonyl compound of the general formula:
wherein R1 and R have the same meaning as in formula I, is reacted under substantially anhydrous conditions with a trihaloacetate of the general formula:
wherein Hal and M have the above-mentioned meaning, in the presence of a highly polar, aprotic inert solvent. The trihalomethyl carbonates are useful as intermediates in the manufacture of pyrethroid insecticides.
通式如下的新型三卤甲基碳酸盐的制备工艺
其中 R1 代表任选取代的环丙基或任选取代的烷基,R1 代表甲基或氢原子,或 R1 和 R2 连同它们所连接的碳原子共同形成环烷基,每个 Hal 代表氯原子或溴原子,M 代表碱金属原子,其中通式如下的羰基化合物
式中 R1 和 R 的含义与式 I 相同,在基本无水条件下与通式为
其中 Hal 和 M 具有上述含义,在高极性、钝性惰性溶剂存在下进行反应。三卤甲基碳酸盐可用作生产拟除虫菊酯杀虫剂的中间体。