Diphenylseleninic anhydride (1) reacts with phenols under neutral conditions to give 0-and phydroxylation, whereas with phenolate anions only o-hydroxylation is observed.
SW7 2AY)Su~zmnry Phenols, including examples with an unblocked para-position, are oxidised to the corresponding orthoquinones using diphenylseleninic anhydride.
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