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Oxidation of polyalkylated aromatics. I. Influence of 3,5-dimethylbenzaldehyde on oxidation of mesitylene

M. Hronec and V. Vesel√Ĺ

Department of Chemistry and Technology of Petroleum, Slovak Technical University, 880 37 Bratislava

 

Abstract:  It has been shown that the oxidation of mesitylene to aromatic acids with oxygen in acetic acid at 90°C catalyzed by Co(II) and bromine salts is manifested on the absorption curves of oxygen by an inflection due to a rapid oxidation of 3,5-dimethylbenzaldehyde, the content of which in the mixture is approximately 26 mole %. Under these reaction conditions the oxidation of 3,5-dimethylbenzaldehyde is influenced mainly by the presence of mesitylene and organic bromides formed during the oxidation. In the initial stage of oxidation, 3,5-dimethylbenzaldehyde added to mesitylene does not markedly accelerate the reaction rate; when added after the rapid oxidation period associated with the inflection on the absorption curve, 3,5-dimethylbenzaldehyde accelerates the reaction several times.

Full paper in Portable Document Format: 271a94.pdf

 

Chemical Papers 27 (1) 94–100 (1973)

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