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. Author manuscript; available in PMC: 2016 Nov 2.
Published in final edited form as: Inorg Chem. 2015 Oct 20;54(21):10269–10280. doi: 10.1021/acs.inorgchem.5b01576

Scheme 1.

Scheme 1

Proposed Oxygen Activation Pathway for the H200C-HPCD Variant That Involves Conversion of a Ferric Superoxo Intermediate to a Distal-Protonated Hydroperoxo, Semiquinone Radical Intermediate via Inner-Sphere PCET. a In the ES complex and superoxo intermediate the substrate is protonated at OC1 (red superscript H).