Dsm Fine Chemicals Austria Nfg Gmbh & Co. Kg

Walther Jary

Peter Poechlauer

Thorsten Ganglberger

A process for catalytically oxidizing alkylaromatic compounds of the formula (I)Ar&#x2014;CH&#x2014;Rwhere Ar is an optionally substituted, aromatic or heteroaromatic 5-membered or 6-membered ring or a ring system having up to 20 carbon atoms where Ar may optionally be fused to a C-C-alkyl group in which up to 2 carbon atoms may be replaced by a heteroatom, and R is hydrogen, phenyl, benzyl or heteroaryl, where the phenyl, benzyl or heteroaryl radicals may also be joined to Ar by a bridge, or R together with Ar forms an optionally substituted ring system which may contain one or more optionally substituted heteroatoms, to the corresponding aromatic or heteroaromatic carboxylic acids in a solvent with ozone in the presence of a transition metal catalyst and optionally in the presence of an acid at a temperature between &#x2212;70&#xb0; C. and 110&#xb0; C. to the corresponding carboxylic acid.

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Steinbach a. Attersee, Austria

Walther Jary