Evidence for a precursor complex in C-H hydrogen atom transfer reactions mediated by a manganese(IV) oxo complex

Abstract

HAT trick: [MnIV(OH)2(H,MePytacn)] 2+ (A) and [MnIV(O)(OH)(H,MePytacn)] + (B) differ in their reactions with C-H bonds: compound A engages in typical single-step hydrogen atom transfer (HAT) reactions, whereas B first forms a substrate-B encounter complex (C; see scheme). This equilibrium alters the relative C-H reactivity from that expected from C-H bond dissociation energies. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.