Novel intermediate in the preparation of cyclopropylcarboxylate esters and process for its manufacture
申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0002556A1
公开(公告)日:1979-06-27
3-Acetoxymethyl-2,2- dimethylcyclopropanecarbaldehy- de dimethyl acetal, especially in the same stereoisomeric form as that of the cyclopropane ring in (+)-3-carene, is a novel intermediate useful in the manufacture of pyrethroid insecticides. It may be manufactured by a process characterised in that 2-(3-acetoxy-methyl-2,2- dimethylcyclopropy-Dvinyl acetate is subjected to ozonolysis and the ozonolysis product so formed is subjected to reduction in the presence of methanol and an acetalizing catalyst.
3-乙酰氧甲基-2,2-二甲基环丙烷-甲醛-二甲缩醛,尤其是与(+)-3-蒈烯中环丙烷环的立体异构体形式相同的立体异构体,是一种新型中间体,可用于生产拟除虫菊酯类杀虫剂。其生产工艺的特点是将 2-(3-乙酰氧基甲基-2,2-二甲基环丙基)乙酸乙烯酯进行臭氧分解,然后在甲醇和缩醛催化剂的作用下将臭氧分解产物还原。