| 摘要 |
1. Process for the preparation of styrylcyclopropanecarboxylic acid esters of the formula I : see diagramm : EP0017952,P11,F1 in which : R represents C1-4 -alkyl or an alcohol radical customary in pyrethroids, R**1 represents alkoxy or alkylthio, optionally substituted by halogen, R**2 represents hydrogen or alkoxy or, together with R**1, represents optionally halogen substituted alkylenedioxy, and R**3 represents hydrogen or chlorine, characterized in that 1-aryl-4-methylpenta-1,3-dienes of the formula II : see diagramm : EP0017952,P11,F2 in which : R**1, R**2 and R**3 have the meaning indicated above, are reacted with diazoacetic acid esters of the formula III : N2 CH-COO-R in which : has the meaning indicated above, in the presence of copper or copper compounds at temperatures between 50 and 200 degrees C. |
