M. Maumy et P. Capdevielle, COPPER-CATALYZED ORTHO-OXIDATION OF PHENOLS BY DIOXYGEN (TYROSINASE MIMICS) DO YIELDS CATECHOLS AS PRIMARY PRODUCTS, Journal of molecular catalysis. A, Chemical, 113(1-2), 1996, pp. 159-166
Evidences are provided that catechols [as copper(II)catecholates] are
the actual primary products of copper-mediated (catalysed) ortho-selec
tive oxidation of phenols, on the contrary to a recent claim reporting
direct generation of ortho-quinones.