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This catalyst system generates highly nucleophilic, electron\u2010rich allylchromium(III) species directly from unactivated alkenes, demonstrating broad applicability to various ketones, including aromatic, aliphatic, and multifunctional ketones. The reaction proceeds under mild conditions with high functional group tolerance. The modular design of the IP\u2010HAT catalysts allows precise tuning of redox potential and HAT activity, with the enhanced reduction potential of the reduced <jats:italic>N<\/jats:italic>\u2010heteroaromatics catalyst playing a pivotal role in efficiently regenerating the electron\u2010rich chromocene(II) catalyst.<\/jats:p>","DOI":"10.1002\/anie.202503249","type":"journal-article","created":{"date-parts":[[2025,3,11]],"date-time":"2025-03-11T12:25:41Z","timestamp":1741695941000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Ion\u2010Pair Hydrogen Atom Transfer Catalysis Enables Cr\u2010Catalyzed Allylation of Ketones Using Hydrocarbon Alkenes"],"prefix":"10.1002","volume":"64","author":[{"given":"Suguru","family":"Arii","sequence":"first","affiliation":[{"name":"Graduate School of Pharmaceutical Sciences The University of Tokyo  7\u20103\u20101 Hongo Bunkyo\u2010ku Tokyo 113\u20100033 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