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Despite this, iron-based catalyst systems are somewhat limited with very little mechanistic understanding of these systems developed. Here we show that an iron metalloborane complex [{(\n                    <jats:sup>\n                      <jats:italic>i<\/jats:italic>\n                      Pr\n                    <\/jats:sup>\n                    DPB\n                    <jats:sup>Ph<\/jats:sup>\n                    )Fe}\n                    <jats:sub>2<\/jats:sub>\n                    (\u03bc\u22121,2-N\n                    <jats:sub>2<\/jats:sub>\n                    )] (\n                    <jats:bold>A<\/jats:bold>\n                    ) is an efficient pre-catalyst for hydroboration of ketones, cyclic esters and CO\n                    <jats:sub>2<\/jats:sub>\n                    with mild conditions. Mechanistic insights reveal a previously unreported direct iron(0)-mediated ligand-to-ligand hydride transfer (LLHT) process is in operation with B\u2013H bond breaking being rate determining, indicating the importance of mechanistic studies on well-known transformations. An iron(I)-benzophenone ketyl radical with a unique\n                    <jats:italic>S<\/jats:italic>\n                    \u2009=\u20091 antiferromagnetic ground state has been isolated and fully characterized.\n                  <\/jats:p>","DOI":"10.1038\/s41467-026-69500-2","type":"journal-article","created":{"date-parts":[[2026,2,19]],"date-time":"2026-02-19T06:07:39Z","timestamp":1771481259000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Iron-borane catalyzed carbonyl hydroboration and isolation of an iron(I)-ketyl radical"],"prefix":"10.1038","volume":"17","author":[{"given":"Laura A.","family":"Grose","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryan J.","family":"Schwamm","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adam","family":"Brookfield","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2760-7163","authenticated-orcid":false,"given":"David","family":"Robinson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1396-7734","authenticated-orcid":false,"given":"Darren","family":"Willcox","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,2,19]]},"reference":[{"key":"69500_CR1","doi-asserted-by":"publisher","first-page":"8915","DOI":"10.1021\/acs.jmedchem.9b00179","volume":"62","author":"J Cramer","year":"2019","unstructured":"Cramer, J., Sager, C. 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