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Many of these proposed intermediates resemble highly reactive organometallic compounds. However, conditions of their formation are generally not tolerated by their isolated organometallic versions and often a different reactivity is observed. Our investigations on their nature and reactivity under commonly used photocatalytic conditions demonstrate that these intermediates are indeed best described as free, superbasic carbanions capable of deprotonating common polar solvents usually assumed to be inert such as acetonitrile, dimethylformamide, and dimethylsulfoxide. Their basicity not only towards solvents but also towards electrophiles, such as aldehydes, ketones, and esters, is comparable to the reactivity of isolated carbanions in the gas\u2010phase. Previously unsuccessful transformations thought to result from a lack of reactivity are explained by their high reactivity towards the solvent and weakly acidic protons of reaction partners. An intuitive explanation for the mode of action of photocatalytically generated carbanions is provided, which enables methods to verify reaction mechanisms proposed to involve an RRPCO step and to identify the reasons for the limitations of current methods.<\/jats:p>","DOI":"10.1002\/anie.202400815","type":"journal-article","created":{"date-parts":[[2024,2,26]],"date-time":"2024-02-26T14:05:06Z","timestamp":1708956306000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Reactivity of Superbasic Carbanions Generated via Reductive Radical\u2010Polar Crossover in the Context of Photoredox Catalysis"],"prefix":"10.1002","volume":"63","author":[{"given":"Sascha","family":"Grotjahn","sequence":"first","affiliation":[{"name":"Faculty of Chemistry and Pharmacy, Institute of Organic Chemistry University of Regensburg  Universit\u00e4tsstra\u00dfe 31 93053 Regensburg 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