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. 2023 Dec 2;14:7985. doi: 10.1038/s41467-023-43559-7

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Fig. 3 — IPC iron-porphyrin carbene complex. a Mechanism featuring Mb-cIII as dead-end byproduct. b Mechanism with Mb-cIII as off-cycle intermediate capable of re-generating IPC. c Mechanism featuring Mb-cIII formation from IPC as an alternative pathway competing with olefin cyclopropanation by IPC. d Mechanism with Mb-cIII as catalytically competent intermediate capable of mediating olefin cyclopropanation.