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Herein, we overcome this challenge in the Cu-catalyzed ATRA reaction though the addition of 1,1\u2032-azobis(cyclohexanecarbonitrile), an in situ reducing agent. Under optimized conditions, the catalyst turnover is restored and challenging halides become competent coupling partners across a variety of substituted alkenes. This strategy enables the synthesis of a diverse array of biologically relevant synthetic intermediates, including \u03b1-haloboronic esters, sulfones, esters, amides, and arenes. The versatility and synthetic utility of these ATRA conditions are demonstrated in 48 examples and 13 subsequent functionalizations.<\/jats:p>","DOI":"10.1021\/acs.orglett.6c03588","type":"journal-article","created":{"date-parts":[[2026,9,19]],"date-time":"2026-09-19T15:02:45Z","timestamp":1789830165000},"page":"12413-12418","source":"Crossref","is-referenced-by-count":0,"title":["Reductive Catalyst\nRegeneration Enables the General\nCu-Catalyzed Atom Transfer Radical Addition with Primary Alkyl Halides"],"prefix":"10.1021","volume":"28","author":[{"given":"Gyeongmin K.","family":"Lee","sequence":"first","affiliation":[{"name":"University of Texas at Austin , , 105 East 24th Street , , ,","place":["Austin, Texas, United States, 78712"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tam D.","family":"Ho","sequence":"additional","affiliation":[{"name":"University of Texas at Austin , , 105 East 24th Street , , ,","place":["Austin, Texas, United States, 78712"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-7815-9157","authenticated-orcid":true,"given":"Jacob A.","family":"Utley","sequence":"additional","affiliation":[{"name":"University of Texas at Austin , , 105 East 24th Street , , ,","place":["Austin, Texas, United States, 78712"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Byung Joo","family":"Lee","sequence":"additional","affiliation":[{"name":"University of Texas at Austin , , 105 East 24th Street , , ,","place":["Austin, Texas, United States, 78712"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ngoc Q.","family":"Ngo","sequence":"additional","affiliation":[{"name":"University of Texas at Austin , , 105 East 24th Street , , ,","place":["Austin, Texas, United States, 78712"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kami L.","family":"Hull","sequence":"additional","affiliation":[{"name":"University of Texas at Austin , , 105 East 24th Street , , ,","place":["Austin, Texas, United States, 78712"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,19]]},"reference":[{"issue":"9","key":"2026100208364708600_cit1","doi-asserted-by":"publisher","first-page":"1626","DOI":"10.1021\/ja01225a517","article-title":"Addition of Derivatives of Chlorinated\nAcetic Acids to Olefins","volume":"67","author":"Kharasch","year":"1945","journal-title":"J. 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