Aromatic hydroxylation: the direct oxidation of C–Pd into C–OPd

Abstract
The C–Pd bond in cyclopalladated azobenzenes [(1) and (3)] is converted into the C–OPd function [(2) and (5)] in good yield by stoicheiometric reactions with m-chloroperbenzoic acid; in effect azobenzene is successively oxidised to 2-hydroxyazobenzene and 2,2′-hydroxyazobenzene.

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