Patent ID: 6365762
Filing Date: 2002-04-02
Classification: C07B,C07C

Abstract:
A process for the oxidation of election-rich aromatic compounds, which comprises oxidizing one or more election-rich C6-C22-aryl compounds and their derivatives in a solution of an anhydride of a carboxylic acid and a carboxylic acid in the presence of a catalyst, wherein the catalyst has the formula:R1aRebOc.Ldâ€ƒâ€ƒ(I), in which and the total of a, b and c is such as to comply with the pentavalency or heptavalency of rhenium, with the proviso that c is not larger than 3Ã—b, with the exception of Re2O2, in whichR1 is absent or identical or different, and is an aliphatic hydrocarbon radical having 1 to 10 carbon atoms, an aromatic hydrocarbon radical having 6 to 10 carbon atoms or an arylalkyl radical having 7 to 9 carbon atoms, wherein the R1 radicals, where appropriate, are optionally substituted identically or differently, independently of one another, and in the case of &dgr;-bonded radicals, at least one hydrogen atom is still bonded to the carbon atom in the &agr;-position and wherein, the anhydride is of the formulaRaC(O)O(O)CRa and the carboxylic acid is of the formulaRaCOOH whereRa is an aliphatic hydrocarbon radical having 1 to 10 carbon atoms, and the mixing ratio of anhydride to carboxylic acid is from 1:10 to 10:1.