Abstract
The rate accelerating effect of even minute amounts of some metal ion derivatives such as Ti(IV), V(V), Mo(VI) and W(VI) on the oxidation of organic and inorganic substrates by hydrogen peroxide[1,2] has been known and synthetically exploited for a long time since the pioneering work of Milas.[3–51 However, only in the last twenty years such a catalytic effect has been satisfactorily rationalized as arising from the in situ formation of peroxometal species which are, by far, more effective oxidants than hydrogen peroxide itself.[1,2,6] Indeed, the rate of reaction (2) carried out by 1, Scheme 1, may be in some cases several orders of magnitude larger than that of reaction (1). To account for the catalytic behavior it is, of course, necessary that, after the oxidation of the substrate, 1 be reformed upon addition of H2O2 to LZM=0.
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