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The reaction is carried out in the absence of metal catalysts or other additives, and its stereoselectivity can be tuned by selecting appropriate solvent mixtures. The reaction\u2018s scope and tolerance towards functional groups, including light\u2010sensitive halogens, free acids and alcohols, were studied, providing reliable access to a wide variety of <jats:italic>\u03b2<\/jats:italic>,<jats:italic>\u03b3<\/jats:italic>\u2010unsaturated ketones. This methodology details the deconjugation of a wide range of unsaturated ketones and, when combined with olefin metathesis, provides an efficient process for either dehomologation or one\u2010carbon double\u2010bond migration of terminal alkenes.<\/jats:p>","DOI":"10.1002\/chem.202200634","type":"journal-article","created":{"date-parts":[[2022,3,24]],"date-time":"2022-03-24T18:48:48Z","timestamp":1648147728000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Metal\u2010Free Photochemical Olefin Isomerization of Unsaturated Ketones via 1,5\u2010Hydrogen Atom Transfer"],"prefix":"10.1002","volume":"28","author":[{"given":"Rajendran","family":"Manikandan","sequence":"first","affiliation":[{"name":"Department of Chemistry Ben-Gurion University of the Negev  Beer-Sheva 8410501 Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ravindra S.","family":"Phatake","sequence":"additional","affiliation":[{"name":"Department of Chemistry Ben-Gurion University of the Negev  Beer-Sheva 8410501 Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1254-1149","authenticated-orcid":false,"given":"N. 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