Dioxygen dioxygenase” type mechanism

Mechanisms have rarely been elucidated unambiguously, especially for easily oxidizable ligands, where alternative explanations are difficult to rule out. In fact, closer examination of some of these so-called transfer reactions has revealed that free hydrogen peroxide is the oxidant (55). Moreover, this type of reaction is restricted to the heavier transition metals which form Jt-type peroxo complexes (7) with dioxygen and are therefore scarcely models for the iron- and copper-containing dioxygenases. 

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