Phenylacetic acid derivatives, preparation thereof and intermediates therefor, and compositions containing them

摘要

Phenylacetic acid derivatives of the formula I where the substituents and the index have the following meanings: X is oxygen or sulfur; R is hydrogen or alkyl; R1 is hydrogen or alkyl; R2 is cyano, nitro, trifluoromethyl, halogen, alkyl or alkoxy; m is 0, 1 or 2, it being possible for the R2 radicals to be different if m is 2; and their salts, processes and intermediates for their preparation, and their use are described.