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. Author manuscript; available in PMC: 2014 Nov 19.
Published in final edited form as: Acc Chem Res. 2013 Sep 26;46(11):2725–2739. doi: 10.1021/ar400149m

FIGURE 18.

FIGURE 18

Reactivities of FeIV=O intermediates in HPPD (left) and HmaS (right), with different substrate (HPP) conformations leading to a σ TS for EAS in HPPD and a π TS for H-atom abstraction in HmaS. Formation of FeIII—O•− species at TS provides FMOs primed for reactivity.