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CeCl_(3)-Promoted Simultaneous Photocatalytic Cleavage and Amination of C_(α)–C_(β)Bond in Lignin Model Compounds and Native Lignin

查看全文 作　　者：Yinling [1]Wang;Jianghua [1]He;Yuetao [1]Zhang 高影响力作者 机构地区：[1]State Key Laboratory of Supramolecular Structure and Materials,College of Chemistry,Jilin University,Changchun,Jilin 130012高影响力机构 出　　处：《CCS Chemistry》索引2020年第2卷第3期,共11页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(grant nos.21975102,21871107,and 21774042). 摘　　要：It remains challenging to achievevaluableplatformchemicals from lignin because of itscomplicated polymeric structure and inherent inert chemical activities.So far,only a fewexamples have been reported for the selective cleavage of C–C bonds in lignin due to their intrinsic inertness and ubiquity.Here,we present a simple and commercially available cerium(Ⅲ)chloride(CeCl_(3))-promoted photocatalytic depolymerization strategy to realize the simultaneous cleavage and amination ofC_(α)–C_(β)bond in a variety of lignin model compounds at room temperature.This procedure does not require any pretreatments and breakdown of C–O bonds or loss ofγ-CH_(2)OHgroup to generate aldehydes(up to 97%)and N-containing products(up to 95%)in good to excellent yields.Additionally,this CeCl_(3)-based photocatalyst system could maintain excellent catalytic performance even after 10 sequential cycles with newstarting materials.Moreover,this approach realizes the precise control over the reaction via switching the external light stimuli on/off.Further,this method is effective for the depolymerization of real lignin,thus affording the corresponding cleavage and amination products of C_(α)–C_(β)bonds. 关 键 词：AMINATION C–C bond cleavage CeCl_(3) lignin depolymerization photocatalytic strategy
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