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Therefore, lowering the bond dissociation energy (BDE) has emerged as a viable strategy for achieving mild yet highly effective cleavage of bonds. In this study, a photocatalytic semi\u2010hydrogenation\/reduction strategy utilizing CsPbBr<jats:sub>3<\/jats:sub> quantum dots (CPB\u2010QDs) and Hantzsch ester (HEH<jats:sub>2<\/jats:sub>) as a synergistic catalytic system was introduced to reduce the BDE of C<jats:sub>\u03b2<\/jats:sub>\u2212O\u2212Ar, achieving effective cleavage of the C<jats:sub>\u03b2<\/jats:sub>\u2212O\u2212Ar bond. This strategy offers a wide substrate scope encompassing various <jats:italic>\u03b2<\/jats:italic>\u2010O\u20104 model lignin dimers, preoxidized \u03b2\u2010O\u20104 polymers, and native oxidized lignin, resulting in the production of corresponding ketones and phenols. Notably, this approach attained a turnover frequency (TOF) that is 17\u2005times higher than that of the reported Ir\u2010catalytic system in the photocatalytic depolymerization of the lignin model dimers. It has been observed via meticulous experimentation that HEH<jats:sub>2<\/jats:sub> can be activated by CPB\u2010QDs via single electron transfer (SET), generating HEH<jats:sub>2<\/jats:sub>\u22c5<jats:sup>+<\/jats:sup> as a hydrogen donor while also serving as a hole quencher. Moreover, HEH<jats:sub>2<\/jats:sub>\u22c5<jats:sup>+<\/jats:sup> readily forms an active transition state with the substrates via hydrogen bonding. Subsequently, the proton\u2010coupled electron transfer (PCET) from HEH<jats:sub>2<\/jats:sub>\u22c5<jats:sup>+<\/jats:sup> to the carbonyl group of the substrate generates a C<jats:sub>\u03b1<\/jats:sub>\u22c5 intermediate.<\/jats:p>","DOI":"10.1002\/anie.202318850","type":"journal-article","created":{"date-parts":[[2024,1,3]],"date-time":"2024-01-03T07:38:36Z","timestamp":1704267516000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["CsPbBr<sub>3<\/sub> Quantum Dots Promoted Depolymerization of Oxidized Lignin via Photocatalytic Semi\u2010Hydrogenation\/Reduction Strategy"],"prefix":"10.1002","volume":"63","author":[{"given":"Huating","family":"Jiang","sequence":"first","affiliation":[{"name":"The Education Ministry Key Lab of Resource Chemistry Shanghai Key Laboratory of Rare Earth Functional Materials Shanghai Frontiers Science Center of Biomimetic Catalysis Shanghai Normal University  Shanghai 200234 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