Add time:07/27/2019         Source:sciencedirect.com

The rate of oxidation of α-methylstyrene catalyzed by cobaltous or manganous acetylacetonates was much higher than that catalyzed by cobaltous decanoate or cobalt phthalocyanine, and the reactions have shown excellent half order relations with respect to metal acetylacetonates over wide range of concentration and a first order dependence on α-methylstyrene concentration. The effect of metal acetylacetonates was remarkably suppressed in the basic solvents pyridine or ethanol. It was concluded that cobaltous and manganous acetylacetonates initiate the chain of autoxidation of α-methylstyrene by activating the oxygen molecule, although they are also effective decomposers of hydroperoxide and so are effective catalysts in the autoxidation of cumene. When 50% of cobaltous acetylacetonate was replaced by manganous acetylacetonate, the metals showed a strong antagonistic effect and the rate of oxidation coincided with the rate catalyzed by cobaltous decanoate.

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