1-Alkenyl chlorides, bromides or iodides can be obtained with very high cis selectivities through Wittig reaction employing α-chloro, α-bromo α-iodo ylids derivefrom tris(2-methoxymethoxyphenyl)phospine. The corresponding α-methoxy substituted ylid produces enethers with again remarkably high cis/trans ratios. Palladium(II) catalyzed coupling of (Z)-1-iodo-1-heptene with ethyl acrylate affords ethyl
Cis-6-undecene-1-chloride and a method for the preparation thereof
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:EP0032396A1
公开(公告)日:1981-07-22
A novel compound cis-6-undecene-1-chloride is prepared by reacting cis-3-octene-1-chloride with metallic magnesium to give a Grignard reagent of the chloride and then reacting the Grignard reagent with 1-bromo-3-chloropropane in the presence of a lithium copper chloride as a catalyst. The inventive compound is a useful intermediate compound for the synthetic preparation of several kinds of so-called sexual pheromone compounds of noxious insects. As an example of such sexual pheromone compounds. the synthetic preparation of cis-9-tetradecenyl acetate is described.