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

Yong CuiQingchun XiaJinjing HuangYan LiuChunxia TanYong Cui
Published in: Journal of the American Chemical Society (2017)
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.
Keyphrases
  • ionic liquid
  • heavy metals
  • high resolution
  • health risk
  • health risk assessment
  • risk assessment
  • solid state
  • data analysis
  • electron microscopy
  • crystal structure
  • visible light
  • water quality