When 1-halogeno-3-alkene-2-ol is reacted with an ortho-carboxylic ester and/or a ketene acetal, a .gamma.-halogeno-.delta.-unsaturated-carboxylic ester is obtained as a main reaction product. When this intermediate is treated with a basic substance, a substituted cyclopropane-carboxylic ester is formed. This ester can be used as an insecticide or an agricultural chemical as it is or after the alcohol residue of the ester has been converted to other alcohol residue.
当1-卤代-3-烯基-2-醇与邻位
羧酸酯和/或酮
缩醛反应时,主要反应产物是γ-卤代-δ-不饱和
羧酸酯。当这种中间体与碱性物质反应时,形成取代
环丙烷羧酸酯。这种酯可以直接用作
杀虫剂或农药,也可以在将酯的醇残基转化为其他醇残基后使用。