Lignin C–C bond cleavage induced by consecutive two-photon excitation of a metal-free photocatalyst,Chemical Communications

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Lignin C–C bond cleavage induced by consecutive two-photon excitation of a metal-free photocatalyst
Chemical Communications ( IF 4.3 ) Pub Date : 2023-01-17 , DOI: 10.1039/d2cc06730g
Pengju Li ₁ , Rong Liu ₁ , Zijian Zhao ₁ , Fushuang Niu ₁ , Ke Hu ₁

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Photocatalytic lignin valorization has caught widespread attention; yet the reaction systems often employ noble metal complexes, hydrogen atom transfer (HAT) agents, and/or sacrificial electron donors/acceptors that do not comply with atom economy or environmental friendliness. Herein, we discovered that N-phenylphenothiazine (PTH) as a metal-free photocatalyst induced the cleavage of the lignin C_α–C_β bond under ambient conditions free of those additional agents with a high yield and selectivity toward benzoic acid. Transient spectroscopic investigations revealed that the energy-demanding C_α–C_β bond cleavage was induced by the potent oxidant, ²PTH˙⁺*, that was derived from consecutive two-photon excitation of PTH.

中文翻译：

无金属光催化剂的连续双光子激发诱导木质素 C-C 键断裂

光催化木质素增值已引起广泛关注；然而，反应系统通常使用不符合原子经济或环境友好性的贵金属络合物、氢原子转移 (HAT) 剂和/或牺牲电子供体/受体。在此，我们发现N-苯基吩噻嗪 (PTH) 作为一种不含金属的光催化剂，在环境条件下诱导木质素 C _α -C _β键的裂解，而无需那些额外的试剂，具有高产率和对苯甲酸的选择性。瞬态光谱研究表明，需要能量的 C _α –C _β键断裂是由强氧化剂² PTH˙ ^+诱导的*，这是源自 PTH 的连续双光子激发。

更新日期：2023-01-17

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