1. Lignin C–C bond cleavage induced by consecutive two-photon excitation of a metal-free photocatalyst.
- Author
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Li, Pengju, Liu, Rong, Zhao, Zijian, Niu, Fushuang, and Hu, Ke
- Subjects
SCISSION (Chemistry) ,ELECTRON donors ,ABSTRACTION reactions ,LIGNINS ,BENZOIC acid ,PRECIOUS metals - Abstract
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 –Cβ 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 Cα –Cβ bond cleavage was induced by the potent oxidant,2 PTH˙+ *, that was derived from consecutive two-photon excitation of PTH. [ABSTRACT FROM AUTHOR]- Published
- 2023
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