化学
离子液体
激进的
木质素
芳基
磺酰
键裂
有机化学
光化学
催化作用
烷基
作者
Ying Kang,Xingmei Lü,Guangjin Zhang,Xiaoqian Yao,Jiayu Xin,Shaoqi Yang,Yongqing Yang,Junli Xu,Mi Feng,Suojiang Zhang
出处
期刊:Chemsuschem
[Wiley]
日期:2019-08-08
卷期号:12 (17): 4005-4013
被引量:41
标识
DOI:10.1002/cssc.201901796
摘要
The degradation of lignin into aromatic products is very important, but harsh conditions and metal-based catalysts are commonly needed to cleave the inert bonds. Herein, an efficient self-initiated radical photochemical degradation for lignin-derived aryl ethers through ionic liquids (ILs) induction is demonstrated. The C-C/C-O bonds can be cleaved efficiently through free-radical-mediated reaction in the binary-ILs system 1-propenyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] imide [PMim][NTf2 ] and the Brønsted acid 1-propylsulfonic-3-methylimidazolium trifluoromethanesulfonate ([PrSO3 HMim][OTf]) under ambient conditions. [PMim][NTf2 ] initiates the reaction by promoting the cleavage of the Cβ -H bond, and [PrSO3 HMim][OTf] catalyzes the subsequent C-O-C bond fragmentation. Furthermore, alkyl, hydroxyl, and peroxy radicals are detected, which suggests degradation based on a photochemical free-radical process. Additionally, alkali lignin could also be degraded in the IL system. This work sheds light on sustainable biomass utilization through a self-initiated radical photochemical strategy under metal-free and mild conditions.
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