申请人:Kuraray Co., Ltd.
公开号:US04458090A1
公开(公告)日:1984-07-03
Novel .gamma.-lactone derivatives are provided. These lactone derivatives, when reacted with hydrogen halide in alcohol, yield .gamma.-halogeno-.delta.-unsaturated carboxylic acid esters. This ring-opening process is useful for the purpose of increasing the yield of pyrethrin analogs which are of value as insecticides and agricultural chemicals. Thus, the .gamma.-lactone derivatives by-produced in the production process for dihalogenovinyl chrysanthemumates are caused to undergo ring-opening reaction to yield the corresponding .gamma.-halogeno-.delta.-unsaturated carboxylic acid esters which are important intermediates for said pyrethrin analogs.
提供了新型的.gamma.-内酯衍生物。这些内酯衍生物在醇中与氢卤酸反应时,会产生.gamma.-卤代-.delta.-不饱和羧酸酯。这种环开放反应对于增加作为杀虫剂和农业化学品有价值的拟除虫菊酯类似物的产量非常有用。因此,通过生产双卤代乙烯基菊酯的过程中产生的.gamma.-内酯衍生物会发生环开放反应,产生相应的.gamma.-卤代-.delta.-不饱和羧酸酯,这些酯是制备拟除虫菊酯类似物的重要中间体。