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This review systematically compares three IPC isomers\u2014terminal carbenes, bridged carbenes, and N\u2010alkyl derivatives\u2014isolated from enzymatic systems with synthetic analogues. X\u2010ray crystal structure analysis, which reveals protein\u2010induced structural adaptations and isomer\u2010specific distortions, also facilitates M\u00f6ssbauer and electron paramagnetic resonance (EPR) spectroscopic studies. Besides ground state assignments on the bridged carbene [Fe(TPP){C\u2550C(\n                    <jats:italic>p<\/jats:italic>\n                    \u2010ClPh)\n                    <jats:sub>2<\/jats:sub>\n                    }C1] ((d\n                    <jats:italic>\n                      <jats:sub>xy<\/jats:sub>\n                    <\/jats:italic>\n                    )\n                    <jats:sup>2<\/jats:sup>\n                    (d\n                    <jats:italic>\n                      <jats:sub>xz<\/jats:sub>\n                    <\/jats:italic>\n                    ,d\n                    <jats:italic>\n                      <jats:sub>yz<\/jats:sub>\n                    <\/jats:italic>\n                    )\n                    <jats:sup>2<\/jats:sup>\n                    (d\n                    <jats:italic>\n                      <jats:sub>z<\/jats:sub>\n                    <\/jats:italic>\n                    <jats:sup>2<\/jats:sup>\n                    )\n                    <jats:sup>1<\/jats:sup>\n                    ) and the N\u2010alkyl Mb(\n                    <jats:italic>N<\/jats:italic>\n                    \u2010CH\n                    <jats:sub>2<\/jats:sub>\n                    COBzyl)(His) ((d\n                    <jats:italic>\n                      <jats:sub>xy<\/jats:sub>\n                    <\/jats:italic>\n                    )\n                    <jats:sup>2<\/jats:sup>\n                    (d\n                    <jats:italic>\n                      <jats:sub>xz<\/jats:sub>\n                    <\/jats:italic>\n                    )\n                    <jats:sup>1<\/jats:sup>\n                    (d\n                    <jats:italic>\n                      <jats:sub>yz<\/jats:sub>\n                    <\/jats:italic>\n                    )\n                    <jats:sup>1<\/jats:sup>\n                    (d\n                    <jats:italic>\n                      <jats:sub>z<\/jats:sub>\n                    <\/jats:italic>\n                    <jats:sup>2<\/jats:sup>\n                    )\n                    <jats:sup>1<\/jats:sup>\n                    (d\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    <jats:sup>2<\/jats:sup>\n                    <jats:sub>\u2212<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>y<\/jats:sub>\n                    <\/jats:italic>\n                    <jats:sup>2<\/jats:sup>\n                    )\n                    <jats:sup>1<\/jats:sup>\n                    ), M\u00f6ssbauer studies also reveal that alongside carbene fragment migration, the bridged carbene, which show shorter Fe\u2500C(R) distance than the\n                    <jats:italic>\u03c3<\/jats:italic>\n                    type Fe\u2500C(sp\n                    <jats:sup>2<\/jats:sup>\n                    \/sp\n                    <jats:sup>3<\/jats:sup>\n                    ) bond, retains strong \u03c0 acceptor capability, in contrast to the stronger\n                    <jats:italic>\u03c3<\/jats:italic>\n                    donor and \u03c0 acceptor capability of the terminal carbene and the N\u2010alky derivative which nearly loses the bonding to iron. Accordingly, very large tetragonalities (|\u0394\/\u03bb|\u00a0&gt;\u00a016) are observed for the bridged carbene Mb(CHCO\n                    <jats:sub>2<\/jats:sub>\n                    Et)(NMH) ((d\n                    <jats:italic>\n                      <jats:sub>xy<\/jats:sub>\n                    <\/jats:italic>\n                    )\n                    <jats:sup>2<\/jats:sup>\n                    (d\n                    <jats:italic>\n                      <jats:sub>xz<\/jats:sub>\n                    <\/jats:italic>\n                    ,d\n                    <jats:italic>\n                      <jats:sub>yz<\/jats:sub>\n                    <\/jats:italic>\n                    )\n                    <jats:sup>3<\/jats:sup>\n                    ) which exhibited rhombic EPR pattern under the near parallel ligand orientation. This work establishes critical connections between synthetic porphyrin and enzymatic systems, highlighting the adjustable scaffolds of engineered proteins in stabilizing various intermediates and advancing the mechanistic understanding of carbene transfer reactions.\n                  <\/jats:p>","DOI":"10.1002\/anie.202513862","type":"journal-article","created":{"date-parts":[[2025,10,8]],"date-time":"2025-10-08T08:24:22Z","timestamp":1759911862000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Stereoelectronic Insight Into Heme Carbene Catalysis: Bridging Enzymatic and Synthetic Systems"],"prefix":"10.1002","volume":"64","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4876-8970","authenticated-orcid":false,"given":"Jianfeng","family":"Li","sequence":"first","affiliation":[{"name":"College of Materials Science and Optoelectronic Technology Center of Materials Science and Optoelectronics Engineering and CAS 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