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- W2324155307 abstract "Ferric tetraamido macrocyclic ligand (TAML)-based catalysts [Fe{C6H4-1,2-(NCOCMe2NCO)2CR2}(OH2)]PPh4 [1; R = Me (a), Et (b)] are oxidized by m-chloroperoxybenzoic acid at −40 °C in acetonitrile containing trace water in two steps to form Fe(V)oxo complexes (2a,b). These uniquely authenticated FeV(O) species comproportionate with the FeIII starting materials 1a,b to give μ-oxo-(FeIV)2 dimers. The comproportionation of 1a–2a is faster and that of 1b–2b is slower than the oxidation by 2a,b of sulfides (p-XC6H4SMe) to sulfoxides, highlighting a remarkable steric control of the dynamics. Sulfide oxidation follows saturation kinetics in [p-XC6H4SMe] with electron-rich substrates (X = Me, H), but changes to linear kinetics with electron-poor substrates (X = Cl, CN) as the sulfide affinity for iron decreases. As the sulfide becomes less basic, the FeIV/FeIII ratio at the end of reaction for 2b suggests a decreasing contribution of concerted oxygen-atom transfer (FeV → FeIII) concomitant with increasing electron transfer oxidation (FeV → FeIV). FeV is more reactive toward PhSMe than FeIV by 4 orders of magnitude, a gap even larger than that known for peroxidase Compounds I and II. The findings reinforce prior work typecasting TAML activators as faithful peroxidase mimics." @default.
- W2324155307 created "2016-06-24" @default.
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- W2324155307 date "2011-10-27" @default.
- W2324155307 modified "2023-10-16" @default.
- W2324155307 title "On the Reactivity of Mononuclear Iron(V)oxo Complexes" @default.
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- W2324155307 doi "https://doi.org/10.1021/ja208007w" @default.
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