METHOD FOR THE PRODUCTION OF ARYLOXIC ACID

摘要

In a process for the preparation of an aryloxyacetic acid by oxidation of aryloxyethanol of the formula IMAGE (I) wherein m represents 1 or 2, n represents the numeral which results from the difference (6-m) and R either individually or independently of one another represent hydrogen, alkyl, cycloalkyl, aryl, aralkyl, alkoxy, cycloalkoxy, aryloxy, hydroxyl, halogen, alkylcarbonyl, arylcarbonyl, carboxyl or nitro, or represent a benzene ring or cycloalkane ring fused to the phenyl ring, with oxygen or an oxygen-containing gas in an aqueous alkaline medium at a temperature from 0 DEG C. to the boiling point of the reaction mixture in the presence of platinum metals and/or palladium metals containing catalyst, the improvement which comprises carrying out the oxidation in the additional presence of an activator of lead and/or bismuth and/or a compound thereof and optionally in the additional presence of Cadmium and/or its compounds.