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      Photoinduced Intermolecular Radical Hydroalkylation of Olefins via Ligated Boryl Radicals-Mediated Halogen Atom Transfer

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          Abstract

          Light-mediated Halogen-Atom Transfer (XAT) has become a significant methodology in contemporary synthesis. Unlike α-aminoalkyl and silyl radicals, ligated boryl radicals (LBRs) have not been extensively explored as halogen atom abstractors. In this study, we introduce NHC-ligated boranes as optimal radical chain carriers for the intermolecular reductive radical hydroalkylation and hydroarylation of electron-deficient olefins by using direct UV-A light irradiation. DFT analysis allowed us to rationalize the critical role of the NHC ligand in facilitating efficient chain propagation.

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          Most cited references42

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          Characterizing chain processes in visible light photoredox catalysis † †Electronic supplementary information (ESI) available: Quantum yield measurements, luminescence quenching experiments, “light/dark” experiments, and time course data. See DOI: 10.1039/c5sc02185e

          The combination of quantum yield and luminescence quenching measurements provides a method to rapidly characterize the occurrence of chain processes in a variety of photoredox reactions.
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            Silyl Radical Activation of Alkyl Halides in Metallaphotoredox Catalysis: A Unique Pathway for Cross-Electrophile Coupling.

            A strategy for cross-electrophile coupling has been developed via the merger of photoredox and transition metal catalysis. In this report, we demonstrate the use of commercially available tris(trimethylsilyl)silane with metallaphotoredox catalysis to efficiently couple alkyl bromides with aryl or heteroaryl bromides in excellent yields. We hypothesize that a photocatalytically generated silyl radical species can perform halogen-atom abstraction to activate alkyl halides as nucleophilic cross-coupling partners. This protocol allows the use of mild yet robust conditions to construct Csp(3)-Csp(2) bonds generically via a unique cross-coupling pathway.
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              Formation of CC Bonds by Addition of Free Radicals to Alkenes

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                Author and article information

                Journal
                Org Lett
                Org Lett
                ol
                orlef7
                Organic Letters
                American Chemical Society
                1523-7060
                1523-7052
                01 July 2024
                12 July 2024
                : 26
                : 27
                : 5839-5843
                Affiliations
                []Flow Chemistry Group, van’t Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam , 1098 XH Amsterdam, The Netherlands
                []The Research Center of Chiral Drugs, Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine , Shanghai 201203, China
                [§ ]PhotoGreen Lab, Department of Chemistry, University of Pavia , 27100 Pavia, Italy
                []SynCat Lab, Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma , 43124 Parma, Italy
                Author notes
                Author information
                https://orcid.org/0000-0003-2201-4828
                https://orcid.org/0000-0001-7114-267X
                Article
                10.1021/acs.orglett.4c02034
                11250028
                38950385
                6d751934-d0cd-4d08-989b-e1ee6f82e7b5
                © 2024 The Authors. Published by American Chemical Society

                Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained ( https://creativecommons.org/licenses/by/4.0/).

                History
                : 03 June 2024
                : 26 June 2024
                : 21 June 2024
                Funding
                Funded by: Narodowe Centrum Nauki, doi 10.13039/501100004281;
                Award ID: 2019/32/T/ST4/00426
                Funded by: Ministero dell''Università e della Ricerca, doi 10.13039/501100021856;
                Award ID: NA
                Funded by: China Scholarship Council, doi 10.13039/501100004543;
                Award ID: NA
                Categories
                Letter
                Custom metadata
                ol4c02034
                ol4c02034

                Organic & Biomolecular chemistry
                Organic & Biomolecular chemistry

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