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Herein, we report photocatalytic addition reactions of ketene silyl acetals with alkenes that proceed through formation of \u03b1\u2010carbonyl radicals. In the presence of an appropriate protic additive, the reactions proceeded smoothly under blue\u2010light irradiation to afford the desired products in moderate to high yields.<\/jats:p>","DOI":"10.1002\/asia.202200647","type":"journal-article","created":{"date-parts":[[2022,7,25]],"date-time":"2022-07-25T15:34:05Z","timestamp":1658763245000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Photocatalytic Addition Reactions of Ketene Silyl Acetals with Alkenes through Formation of \u03b1\u2010Carbonyl Radicals"],"prefix":"10.1002","volume":"17","author":[{"given":"Tsubasa","family":"Hirata","sequence":"first","affiliation":[{"name":"Department of Chemistry School of Science The University of Tokyo, Hongo  Bunkyo-ku 113-0033 Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshihiro","family":"Ogasawara","sequence":"additional","affiliation":[{"name":"Department of Chemistry School of Science The University of Tokyo, Hongo  Bunkyo-ku 113-0033 Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8235-4368","authenticated-orcid":false,"given":"Sh\u016b","family":"Kobayashi","sequence":"additional","affiliation":[{"name":"Department of Chemistry School of Science The University of Tokyo, Hongo  Bunkyo-ku 113-0033 Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7127-0313","authenticated-orcid":false,"given":"Yasuhiro","family":"Yamashita","sequence":"additional","affiliation":[{"name":"Department of Chemistry School of Science The University of Tokyo, Hongo  Bunkyo-ku 113-0033 Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2022,9,2]]},"reference":[{"key":"e_1_2_8_1_1","unstructured":"\u00a0"},{"key":"e_1_2_8_2_2","doi-asserted-by":"publisher","DOI":"10.1055\/s-1977-24284"},{"key":"e_1_2_8_3_2","doi-asserted-by":"publisher","DOI":"10.1039\/cs9811000083"},{"key":"e_1_2_8_4_2","doi-asserted-by":"publisher","DOI":"10.1055\/s-1983-30204"},{"key":"e_1_2_8_5_2","doi-asserted-by":"publisher","DOI":"10.1055\/s-1983-30234"},{"key":"e_1_2_8_6_2","first-page":"317","volume":"4","author":"Kobayashi S.","year":"2002","journal-title":"Product Subclass 16: Silyl Enol Ethers, Sci. Synth."},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.197708171"},{"key":"e_1_2_8_8_1","first-page":"1","volume":"62","author":"Chi B.-C.","year":"2003","journal-title":"Org. React."},{"key":"e_1_2_8_9_1","first-page":"1","volume":"72","author":"Ciganek E.","year":"2009","journal-title":"Org. React."},{"key":"e_1_2_8_10_1","first-page":"2","volume-title":"Comprehensive Organic Synthesis","author":"Davis B. 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