Abstract
AbstractC−H oxidation is catalyzed by a high‐spin ferrous dimer, [(L1)2Fe2(CH3CN)2](PF6)4 (1), that offers two identical functional sites, separated by > 7 Å. The complex provides a unique contrast to both mononuclear and binuclear non‐heme enzyme active sites as well as biomimetic complexes. The oxidative activity of 1 was examined using a range of substrates (cyclohexene, 9,10‐dihydroanthracene, xanthene, triphenylmethane, triphenylphosphine, and cyclohexane) and PhIO as an oxidant. The studies establish the O‐atom transfer and H‐atom abstraction ability of the diiron complex. We further probe the energetics of cyclohexene oxidation by 1 and derive putative mechanisms for the pathways of allylic alcohol and epoxide formation using density functional theory (DFT) calculations. The DFT calculations indicate that the oxidation reactions proceed via a FeIV=O species in the triplet state, and that both iron centers can act independently of each other. The combined results provide insight into hydrocarbon oxidation by non‐coupled binuclear systems.
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