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Herein, we develop two novel formylating reagents that overcome this limitation by generating an ambiphilic masked formyl radical, enabling the masked formylation of both activated and unactivated alkenes. The reaction initiates from the N\u2500O bond homolysis of (benzoyloxy)\u2010(methylsulfonyl)methyl oxime ester reagents under the photocatalytic energy\u2010transfer strategy, releasing CO\n                    <jats:sub>2<\/jats:sub>\n                    to form a persistent iminyl radical and a transient ambiphilic (benzoyloxy)\u2010(methylsulfonyl)methyl radical as the masked formyl radical. Consequently, the aminoformylation, heteroarylformylation, and hydroformylation of alkenes can be achieved by adding the masked formyl radicals to olefins, followed by quenching of the formed carbon\u2010radicals by iminyl radicals, heteroarenes, and solvents, respectively. The resulting masked aldehydes are readily deprotected under mild basic or acidic conditions, affording simple or functionalized free aldehydes. Density functional theory (DFT) calculations confirm that the (benzoyloxy)\u2010(methylsulfonyl)methyl radical has superior electrophilicity (\n                    <jats:italic>\u03c9<\/jats:italic>\n                    = 1.82\u00a0eV) compared to conventional formyl radical equivalents.\n                  <\/jats:p>","DOI":"10.1002\/anie.6695860","type":"journal-article","created":{"date-parts":[[2026,7,10]],"date-time":"2026-07-10T10:03:34Z","timestamp":1783677814000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Conversion of Alkenes Into Simple or Functionalized Aldehydes by Reaction With an Ambiphilic Masked Formyl Radical"],"prefix":"10.1002","volume":"65","author":[{"given":"Sheng\u2010Qiang","family":"Lai","sequence":"first","affiliation":[{"name":"State Key Laboratory of Natural Product Chemistry College of Chemistry and Chemical Engineering Lanzhou University  Lanzhou 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Natural Product Chemistry College of Chemistry and Chemical Engineering Lanzhou University  Lanzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lin\u2010Yuan","family":"Zhu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Natural Product Chemistry College of Chemistry and Chemical Engineering Lanzhou University  Lanzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0507-9742","authenticated-orcid":false,"given":"Bing","family":"Han","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Natural Product Chemistry College of Chemistry and Chemical Engineering Lanzhou University  Lanzhou 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