Process for the preparation of styryl-cyclopropanecarboxylic acid esters and new intermediate products for this process

Abstract

A process for the preparation of a styryl-cyclopropane-carboxylic acid ester of the formula ##STR1## in which R is C.sub.1-4 -alkyl or an alcohol radical customary in pyrethroids, R.sup.1 is alkoxy or alkylthio, either of which may be optionally substituted by halogen, R.sup.2 is hydrogen or alkoxy, or R.sup.1 and R.sup.2 together are optionally halogen-substituted alkylenedioxy, and R.sup.3 is hydrogen or chlorine, comprising reacting a compound of the formula ##STR2## with, respectively, one, two or three equivalents of a base at a temperature below 60.degree. C. The products are insecticidally active when R is the residue of a pyrethroid-type alcohol. Various syntheses are given for the starting materials which are new.

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