Abstract
In this work, the Co(II)-catalyzed oxidations of toluene and p-toluic acid have been carried out under mild conditions. A synergistic effect was found by using zirconium as a cocatalyst and ketones as promoters. Carbon dioxide, an alternative diluent gas to nitrogen, has a strong activation effect on the oxidation, especially on shortening the induction period. Under certain conditions, the reaction did not work at all with N2/O2 but proceeded effectively with CO2/O2, affording high yields of benzoic acid.
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