Bis(salicylidene)ethylenediaminatocobalt(II) catalyses the oxygenation of 3-hydroxyflavones in dimethylformamide giving rise to oxidative cleavage of the heterocyclic ring of the flavones to give the corresponding depsides in excellent yield; this provides a nonenzymic model for the reaction of quercetinase.
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Nishinaga et al. (1974) studied this question.
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