Covalent triazine framework catalytic oxidative cleavage of lignin models and organosolv lignin,Green Chemistry

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Covalent triazine framework catalytic oxidative cleavage of lignin models and organosolv lignin
Green Chemistry ( IF 9.3 ) Pub Date : 2018-02-05 00:00:00 , DOI: 10.1039/c8gc00268a
Li Zhao _{1,

2,

3,

4,

5} , Song Shi _{1,

2,

3,

4,

5} , Meng Liu _{1,

2,

3,

4,

5} , Guozhi Zhu _{1,

2,

3,

4,

5} , Min Wang _{1,

2,

3,

4,

5} , Wenqiang Du _{1,

2,

3,

4,

5} , Jin Gao _{1,

2,

3,

4,

5} , Jie Xu _{1,

2,

3,

4,

5}

Affiliation

Covalent triazine frameworks (CTFs) were reported to be effective in the oxidative cleavage of the lignin model compound 2-phenoxyacetophenone, as metal-free catalysts with O₂, producing phenol, benzoic acid, methyl benzoate and methyl benzoylformate as the major products. Combining the detailed characterizations with the reaction results, the triazine structure with unique properties of CTFs contributes to their superior catalytic performance. Mechanism investigation, including isotope-labeling, radical trapping and intermediate verification experiments, was carried out. CTFs promoted the decomposition of peroxide and cleavage of both the C–C bond and C–O bond occurred. The catalyst was reusable and very stable under the present reaction conditions. When CTFs were applied to the catalytic oxidative cleavage of organosolv lignin, nearly 80% of β-O-4 ketone bonds of the oxidized lignin were converted, suggesting the potential of CTFs in lignin depolymerization.

中文翻译：

木质素模型和有机溶剂木质素的共价三嗪骨架催化氧化裂解

据报道，共价三嗪骨架（CTF）可有效地氧化木质素模型化合物2-苯氧基苯乙酮作为具有O ₂的无金属催化剂，进行氧化裂解。主要生产苯酚，苯甲酸，苯甲酸甲酯和苯甲酰甲酸甲酯。将详细的表征与反应结果相结合，具有CTFs独特性能的三嗪结构有助于其优异的催化性能。进行了机理研究，包括同位素标记，自由基捕获和中间验证实验。CTF促进了过氧化物的分解，并发生了C–C键和C–O键的断裂。该催化剂在当前反应条件下是可重复使用的并且非常稳定。当将CTF用于有机溶剂木质素的催化氧化裂解时，氧化的木质素的近80％的β-O-4酮键被转化，表明CTF在木质素解聚中的潜力。

更新日期：2018-03-20

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