The liquid-phase oxidation of aldehydes with metal tetra(p-tolyl)porphyrins.

The effects of the kind of metal of metal porphyrins and the substituent of the phenyl group of porphynato plane were discussed, using them as catalysts in the autoxidation of aldehydes. The effect of the solvent and the additive on the above-mentioned catalytic activity of the porphyrins was put into order by means of their pKa(BH+) and pKa(BH+) values; the increased pKa(BH+), namely, the electron-donating power of solvents, seemed to lead to their strong coordination, followed by the initiation of the coordination of oxygen. On the other hand, the oxygen which had been activated on the porphyrins was estimated to react with or be stabilized by a solvent with a low pKa(H+); it could not initiate the autoxidation with ease.

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