Frustrated Lewis pairs in situ formation in B-based porous aromatic frameworks for efficient o-phenylenediamine cyclization  

作　　者：Anqi Dai Shulin Li Tienan Wang Yuting Yang Yuyang Tian Xiaofei Jing Guangshan Zhu 

机构地区：[1]Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education,Faculty of Chemistry,Northeast Normal University,Changchun 130024,China

出　　处：《Chinese Chemical Letters》2023年第5期567-570,共4页中国化学快报（英文版）

基　　金：the financial support by the Fundamental Research Funds for the Central Universities(No.2412019FZ008);the National Natural Science Foundation of China(Nos.22131004 and U21A20330);the"111 Project(No.B18012)。

摘　　要：Benzimidazoles are very important chemical materials in the pharmaceutical industry,and the most common synthetic route is cyclization of o-phenylenediamine with carbon sources,in which utilization of inexpensive and abundant CO_(2)as C1 source is very impressive.Porous aromatic frameworks(PAFs)with highly desired skeletons have attracted great attentions in gas capture and catalysis.Herein,B-based PAF-165 and PAF-166 are designed and synthesized via Friedel-Crafts alkylation reaction,which present high surface areas as well as high stability.Benefiting from the abundant electron-deficient B centers,both PAFs exhibit excellent selective CO_(2)adsorption abilities.The presence of sterically hindered B units in PAFs can act as Lewis acid active sites for the frustrated Lewis pairs(FLPs)in situ formation with ophenylenediamine,thus promoting the synthesis of benzimidazole.The optimal reaction conditions for o-phenylenediamine cyclization with PAF catalysts are explored,and the reaction mechanism is also proposed.This work provides feasible ideas for incorporating FLPs within porous materials as reusable heterogeneous catalysts for CO_(2)capture and conversion.

关 键 词：Porous aromatic frameworks(PAFs) CO_(2)capture and conversion Gas sorption Frustrated lewis pairs(FLPs) Heterogeneous catalysis 

分 类 号：O626.23[理学—有机化学]