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However, the catalytic carboxylation of abundant allylic C(sp\n                    <jats:sup>3<\/jats:sup>\n                    )\u2500H bonds with CO\n                    <jats:sub>2<\/jats:sub>\n                    , which presents a unique opportunity to synthesize structurally diverse 3\u2010butenoic acids, still remains challenging. Herein, we report the first copper metallaphotoredox\u2010catalyzed formal allylic C(sp\n                    <jats:sup>3<\/jats:sup>\n                    )\u2500H carboxylation with CO\n                    <jats:sub>2<\/jats:sub>\n                    , enabling efficient and selective synthesis of 3\u2010butenoic acids under mild and redox\u2010neutral conditions. This strategy lies in combining highly reducing photocatalysts to generate alkene radical anion intermediates with copper catalysis to orchestrate regioselective elimination, providing a distinct pathway from traditional allylic C(sp\n                    <jats:sup>3<\/jats:sup>\n                    )\u2500H functionalization via forming allyl\u2010metal intermediates. This method features high atom and step economy, broad substrate scope, good functional group tolerance, facile scalability, and easy access to valuable compounds, including diverse bioactive molecules, natural products, and\n                    <jats:sup>13<\/jats:sup>\n                    C\u2010labeled anti\u2010inflammatory drug sulindac.\n                  <\/jats:p>","DOI":"10.1002\/anie.5979629","type":"journal-article","created":{"date-parts":[[2026,4,11]],"date-time":"2026-04-11T17:30:05Z","timestamp":1775928605000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Formal Allylic C(sp\n                    <sup>3<\/sup>\n                    )\u2212H Carboxylation With CO\n                    <sub>2<\/sub>\n                    via Copper Metallaphotoredox Catalysis"],"prefix":"10.1002","volume":"65","author":[{"given":"Jun\u2010Ping","family":"Yue","sequence":"first","affiliation":[{"name":"Key Laboratory of Green Chemistry &amp; Technology of Ministry of Education College of Chemistry Sichuan University  Chengdu P. 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