Rapid conversion of phenols to p-benzoquinones under acidic conditions with lead dioxide

[摘要]：Treatment of 4-unsubstituted and 4-halogenated phenols with PbO2 aad 70% HClO4 in AcOH afforded the corresponding p-benzoquinones in fair to high yields. The oxidation of 4-substituted 2,6-di-tert-butylphenols 6 with PbO2 and 70% HClO4 in acetone gave 2,6-di-tert-butyl-p-benzoquinone (2).

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