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(a) Quantum tunneling (wavy arrow) leads to an effective energy barrier (ΔE‡eff) 1–4 kcal/mol below TS. (b) Reactivity pattern for [FeIV(O)(TMC)(L)]z+ in HAT from alkanes (red line) and oxygen-transfer to phosphines (back line). Figure is adapted from ref (328). Copyright 2015 American Chemical Society.
