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Ajay Jha, Dr. Kashinath R. Patil and Dr. Chandrashekhar V. Rode Mixed Co–Mn Oxide-Catalysed Selective Aerobic Oxidation of Vanillyl Alcohol to Vanillin in Base-Free Conditions ChemPlusChem 78

Article first published online: 14 OCT 2013 | DOI: 10.1002/cplu.201300247

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It takes two: Mn in the MnCo mixed oxide (MO) forms a metal hydroperoxo complex simultaneously giving the phenolate ion of vanillyl alcohol under base-free conditions, which undergoes smooth air oxidation to give vanillin with >83 % selectivity (see scheme). The high catalytic activity of the MnCo-MO results from a synergic effect of the MO phases, which is absent in single Mn or Co oxides.

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