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The reaction products and kinetics of the oxidation of several substituted toluenes by Co111 acetate in acetic acid solution were determined. Under anaerobic conditions the substituted toluenes were first converted into benzyl acetate and subsequently into benzaldehyde. Under anaerobic and aerobic conditions the same rate equation and rate constant were found for the oxidation, but the product distribution differed strongly. The main products of the aerobic oxidation are benzaldehyde and benzoic acid, derived from the substituted toluenes used. Regeneration of Co111 acetate occurs in aerobic solutions, which leads to stationary values for the concentration ratios Coni/Co" and RCHO/RCH3. A reaction mechanism is proposed to explain the results obtained.

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Optical and ion migration experiments were carried out with acetic acid solutions of Co" and Co"' acetate. The results indicate a mononuclear structure with six ligands. The largest amount of these complexes is uncharged.