Studies on sulfinatodehalogenation: the addition reaction of halocarbons with olefins initiated by sodium dithionite
作者:Fan-Hong Wu、Wei-Yuan Huang
DOI:10.1016/s0022-1139(01)00400-6
日期:2001.7
Halocarbons such as carbon tetrachloride, CCl3Br, CF3CCl3, BrCF2CF2Br, BrCF2CFClBr and CF2Br2, reacted with olefins in the presence of the sulfinatodehalogenation reagent sodium dithionite under mild conditions to give the corresponding adducts. In the case of F113, CFCl2CF2CFCl2 and CF3Cl3, the polyfluoroalkylation product resulted.
Method of producing cyclopropanecarboxylic acids and esters
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.
Novel syntheses of dihalovinylcyclopropanecarboxylates, including potent insecticides, are described. The processes begin with the reaction between an alkenol and an orthoester to produce a .gamma.-unsaturated carboxylate, followed by the catalyzed addition of a carbon tetrahalide to the double bond and dehydrohalogenation to produce a cyclopropane derivative.
Method of producing gamma-halogeno-delta unsaturated carboxylic acid
申请人:Kuraray Co., Ltd.
公开号:US04468521A1
公开(公告)日:1984-08-28
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.