文献类型：期刊文献

英文题名：Efficient cycloaddition of CO2 and epoxides to cyclic carbonates using salen-based covalent organic framework as a heterogeneous catalyst

作者：Tong, Yutao[1];Cheng, Ruihua[1,2];Dong, Huan[1];Liu, Boping[3]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Meilong Rd 130, Shanghai 200237, Peoples R China;[2]Guangdong Univ Technol, Sch Biomed & Pharmaceut Sci, Guangzhou 510006, Peoples R China;[3]South China Agr Univ, Coll Mat & Energy, Guangzhou 510642, Peoples R China

年份：2022

卷号：29

期号：4

起止页码：1253

外文期刊名：JOURNAL OF POROUS MATERIALS

收录：;EI(收录号：20221812065126);WOS:【SCI-EXPANDED(收录号:WOS:000795223800001)】；

基金：This work was supported by the Pujiang Talent Projects (16PJD016) funding.

语种：英文

外文关键词：CO2 cycloadditions; Epoxides; Cyclic carbonate; Salen; COF

摘要：Salen-based covalent organic framework (COF), constructed by salen skeleton, has great potential applications as the heterogeneous catalyst due to its unique salen-functionalized structure and uniform porous microenvironment. In this study, the mesoporous crystalline salen-COF was facile synthesized via heating salicylaldehyde and ethylenediamine in the air and characterized by fourier transform infrared, powder X-ray diffractometer, Brunauer-Emmett-Teller, and inductively coupled plasma atomic emission spectrometer. The deliberately selected macromonomer endowed salen-COF with a large pore size (2.06 nm). After metalation with cobalt, the obtained salen-COF-Co exhibited high Co(salen) crystallinity as well as the well-retained COF structure. Under the optimized reaction conditions (0.25 mol% salen-COF-Co, 120 degrees C, and 2.0 MPa CO2), the salen-COF-Co exhibited high reactivity and > 99% selectivity for the CO2 cycloaddition with varieties of epoxides (12 examples) to afford multifunctional cyclic carbonates. Noting that the cyclic bis- and tris-carbonates were successfully obtained with high conversions and > 99% selectivities. Moreover, the unsubstituted trimethylene oxide and hydroxyl-functionalized substituted 3-ethyl-3-methyloloxetane were successfully converted to the corresponding six-membered cyclic carbonates with moderate conversions and > 99% selectivities. In addition, during at least five recycle tests, the robust heterogeneous salen-COF-Co exhibited excellent recyclability and reusability, maintaining high crystallinity and ordered porous structure with stable reactivity. This study provides a potential heterogeneous porous catalyst for selective CO2 cycloaddition with epoxides and oxetanes.