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    • Visible-Light-Driven Chlorine-Atom-Mediated Efficient and Selective Cleavage of C–C Bond in Lignin Models

    Pengju Li,Rong Liu,Zijian Zhao, Weijian Yang,Fushuang Niu,Limei Tian,Ke Hu

    ACS SUSTAINABLE CHEMISTRY & ENGINEERING（2023）

    Fudan Univ

    Cited 7|Views12
    Abstract
    Lignin valorization to aromatic fine chemicals requires selective cleavage of a high-energy C-C bond under mild conditions. Herein, we report the efficient and selective C-C bond cleavage of lignin model substrates through a chlorine (Cl) atom as the hydrogen atom transfer agent generated by visible-light excitation of the metal-free photocatalyst perylene diimide. With the assistance of the Cl atom, the overall yield of C-C bond cleavage products in model substrate beta-O-4 linkages reached 82.5% under visible-light excitation. This work makes use of metal-free photocatalysts and ubiquitous chloride as an alternative sustainable method for lignin depolymerization.
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    Perylene Diimide Photocatalyst,Chloride Oxidation,HAT Agent,C-C BondCleavage,BiomassValorization
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    【要点】：该论文报道了一种利用可见光驱动、氯原子介导的高效选择性断裂木质素模型中的C-C键的新方法，实现了木质素的高值转化。
    

    【方法】：研究采用无金属光催化剂芘二亚胺，在可见光激发下产生氯原子作为氢原子转移剂，实现木质素模型底物中C-C键的选择性断裂。
    

    【实验】：实验在可见光照射下，以木质素模型β-O-4连接为对象，使用氯化钠作为氯源，成功将C-C键断裂产物的总产率提高至82.5%，实验所使用的数据集为木质素模型底物。