Substituted pentane (or pentene) carboxylic acids and their derivatives, process for their preparation and their use for the preparation of 3-(arylvinyl)-2,2-dimethyl-cyclopropane-1-carboxylates

摘要

The present invention relates to a new process for the preparation of 3- (arylvinyl) -2,2-dimethyl-cyclopropane-1-carboxylic acid esters of the formula (I) IMAGE in which Ar, R and R 1 have the meaning given in the description, characterized in that compounds of the general formula (II) (process 1a), (III) (process 1b) or (IV) (process 1c) IMAGE are reacted with one, two or three equivalents of base and new intermediates for carrying them out Process and method for producing these intermediates.