Construction of an Asymmetric Porphyrinic Zirconium Metal–Organic Framework through Ionic Postchiral Modification
作者:Kayhaneh Berijani、Ali Morsali
DOI:10.1021/acs.inorgchem.0c02811
日期:2021.1.4
bimodal porosity with high surface area and stability. Additionally, its ability was investigated in asymmetric catalyses of prochiral substrates. Interactions between framework chiral species and prochiral substrates have large impacts on the catalytic ability and chirality induction. This chiral catalyst proceeded asymmetric epoxidation and CO2 fixation reactions at lower pressure with high enantioselectivity
Chiral ionic liquids improved the asymmetric cycloaddition of CO2 to epoxides
作者:Suling Zhang、Yongzhong Huang、Huanwang Jing、Weixuan Yao、Peng Yan
DOI:10.1039/b821513h
日期:——
The new catalyst system of chiral SalenCo(OAc)/chiral ionic liquid was developed to catalyze the asymmetric cycloaddition reaction of CO2 and epoxides yielding the chiral cyclic carbonates. The synergistic effect between them is discussed.
A series of novel chiral metal-containing ionic liquids (CMILs) consisting of the cation of crown ether-chelated potassium/sodium and the anion of chiral amino acids were designed and synthesized. These new CMILs were used to catalyze the enantioselective cycloaddition of epoxides and carbon dioxide incorporating with the salenCo(OOCCCl3) to generate corresponding chiral cyclic carbonates under mild conditions. These new catalysts can be recycled at least five times without significant loss of activity and enantioselectivity.
Bifunctional Aluminum Catalyst for CO<sub>2</sub> Fixation: Regioselective Ring Opening of Three-Membered Heterocyclic Compounds
作者:Wei-Min Ren、Ye Liu、Xiao-Bing Lu
DOI:10.1021/jo501926p
日期:2014.10.17
Regioselective ring opening of three-membered heterocyclic compounds (epoxides or N-substituted aziridines) at various temperatures was observed in coupling reactions with CO2 by the use of an aluminum–salen catalyst in conjunction with intramolecular quaternary ammonium salts as cocatalysts, affording the corresponding five-membered cyclic products with complete configuration retention at the methine
Salen(Co(<scp>iii</scp>)) imprisoned within pores of a metal–organic framework by post-synthetic modification and its asymmetric catalysis for CO<sub>2</sub> fixation at room temperature
has been demonstrated. By adsorption and then post-synthetically modified (PSM) procedures, chiral salen(Co(III)) could be imprisoned within the cages of an MOF and remained in its free form. This is the first report on the successful application of CMOFs in heterogeneous asymmetric catalysis for coupling CO2 with epoxides to obtain optically active cyclic carbonates at room temperature.