Process for the manufacture of derivatives of benzoic acid

Details Process for the manufacture of derivatives of benzoic acid Process for the manufacture of derivatives of benzoic acid

C - Chemistry, Metallurgy

07

C

260/512.1

C07C 51/255 (2006.01) C07C 51/265 (2006.01) C07C 63/00 (2006.01)

Patent

CA 1310666

ABSTRACT OF THE DISCLOSURE A process for the manufacture of benzoic acid derivatives is described. The process is based on the reaction of a toluene derivative in a liquid phase oxidation with an oxygen containing gas in the presence of a phase-transfer catalyst (a), a transition metal salt (b) and traces of a polar solvent, such as water, the molar ratio between (a) and (b) being in the range of between 0.25:1 to 1.5:1. The phase-transfer catalyst is selected from quaternary ammonium and phosphonium salts having a total carbon atoms in the range of 17 to 58, the anion bound thereto being selected from Br-, F-, Cl-, OH-, CH3COO- or HSO4-. The benzoic acid derivatives produced are characterized by their very high purity and high conversion reaching generally values of above 95%.

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