| 摘要 |
A process for the preparation of a styrylcyclopropane-1-carboxylic acid ester of the formula <IMAGE> in which R is C1-4-alkyl or an alcohol radical customary in pyrethroids, R1 is alkoxy or alkylthio, either of which may be optionally substituted by halogen, R2 is hydrogen or alkoxy, or R1 and R2 together are optionally halogen-substituted alkylenedioxy, and R3 is hydrogen or chlorine, comprising reacting an ester of the formula <IMAGE> in which Hal is chlorine or bromine, with a base. The compounds are insecticidally active. Numerous syntheses of the starting materials, some involving new intermediates, are also shown. |
