An investigation of benzylic oxidations with manganese dioxide supported on neutral alumina has been carried out. Isolation of intermediated products, which is possible in some cases, gives strong support for the reaction mechanism proposed. With 2,6‐di‐tert‐butyl‐4‐methylphenol, 4,4′‐dihydroxy‐3,5,3′,5′‐tetra‐tert‐butyldiphenylmethane,2,6‐di‐tert‐butylphenol and 4‐methyl‐phenol, selective formation of essentially a single product in excellent yield was obtained.
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Liu et al. (1989) studied this question.
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