Chiral Covalent Organic Frameworks with High Chemical Stability for Heterogeneous Asymmetric Catalysis. 2017

Xing Han, and Qingchun Xia, and Jinjing Huang, and Yan Liu, and Chunxia Tan, and Yong Cui
School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , Shanghai 200240, China.

Covalent organic frameworks (COFs) featuring chirality, stability, and function are of both fundamental and practical interest, but are yet challenging to achieve. Here we reported the metal-directed synthesis of two chiral COFs (CCOFs) by imine-condensations of enantiopure 1,2-diaminocyclohexane with C3-symmetric trisalicylaldehydes having one or zero 3-tert-butyl group. Powder X-ray diffraction and modeling studies, together with pore size distribution analysis demonstrate that the Zn(salen)-based CCOFs possess a two-dimensional hexagonal grid network with AA stacking. Dramatic enhancement in the chemical stability toward acidic (1 M HCl) and basic (9 M NaOH) conditions was observed for the COF incorporated with tert-butyl groups on the pore walls compared to the nonalkylated analog. The Zn(salen) modules in the CCOFs allow for installing multivariate metals into the frameworks by postsynthetic metal exchange. The exchanged CCOFs maintain high crystallinity and porosity and can serve as efficient and recyclable heterogeneous catalysts for asymmetric cyanation of aldehydes, Diels-Alder reaction, alkene epoxidation, epoxide ring-opening, and related sequential reactions with up to 97% ee.

UI MeSH Term Description Entries

Related Publications

Xing Han, and Qingchun Xia, and Jinjing Huang, and Yan Liu, and Chunxia Tan, and Yong Cui
June 2022, Angewandte Chemie (International ed. in English),
Xing Han, and Qingchun Xia, and Jinjing Huang, and Yan Liu, and Chunxia Tan, and Yong Cui
June 2017, Journal of the American Chemical Society,
Xing Han, and Qingchun Xia, and Jinjing Huang, and Yan Liu, and Chunxia Tan, and Yong Cui
October 2020, Journal of the American Chemical Society,
Xing Han, and Qingchun Xia, and Jinjing Huang, and Yan Liu, and Chunxia Tan, and Yong Cui
September 2016, Journal of the American Chemical Society,
Xing Han, and Qingchun Xia, and Jinjing Huang, and Yan Liu, and Chunxia Tan, and Yong Cui
June 2021, Small (Weinheim an der Bergstrasse, Germany),
Xing Han, and Qingchun Xia, and Jinjing Huang, and Yan Liu, and Chunxia Tan, and Yong Cui
November 2020, Chemistry (Weinheim an der Bergstrasse, Germany),
Xing Han, and Qingchun Xia, and Jinjing Huang, and Yan Liu, and Chunxia Tan, and Yong Cui
December 2014, Chemical communications (Cambridge, England),
Xing Han, and Qingchun Xia, and Jinjing Huang, and Yan Liu, and Chunxia Tan, and Yong Cui
April 2024, Angewandte Chemie (International ed. in English),
Xing Han, and Qingchun Xia, and Jinjing Huang, and Yan Liu, and Chunxia Tan, and Yong Cui
February 2012, Chemical reviews,
Xing Han, and Qingchun Xia, and Jinjing Huang, and Yan Liu, and Chunxia Tan, and Yong Cui
October 2010, Journal of the American Chemical Society,
Copied contents to your clipboard!