Remarkable enhancement of aerobic epoxidation reactivity for olefins catalyzed by μ-oxo-bisiron(III) porphyrins under ambient conditions

With mu-oxo dimeric iron(III) porphyrins [((FeTPP)-T-III)(2)O] as a catalyst, isobutylaldehyde as co-reductant, and dioxygen as oxidant, an efficient model system for epoxidation of olefins has been developed Compared with mono-metalloporphyrins as catalyst, a remarkable enhancement of reactivity was obtained for the present olefin epoxidation system. in which the turnover number (TON) of the catalyst has doubled from about 700 million to 1400 million Moreover. a plausible mechanism involving both binuclear and mono-nuclear intermediate has been proposed (C) 2009 Elsevier Ltd All rights reserved I