Pyridine-bridged bifunctional organocatalysts for the synthesis of cyclic carbonates from carbon dioxide
作者:Quan-Yao Liu、Lei Shi、Ning Liu
DOI:10.1177/1747519819858710
日期:2019.7
halides are used as efficient bifunctionalorganocatalysts for the synthesis of cyclic carbonates from CO2 and epoxides under mild reaction conditions. Control experiments suggest that the cycloaddition reaction is realized by the combination of the nucleophilic halide anions with hydroxyl and carboxyl groups as hydrogen bond donors. Moreover, the bifunctionalorganocatalysts can be easily recycled five
羟基和羧基官能化的咪唑鎓卤化物用作有效的双功能有机催化剂,用于在温和的反应条件下由 CO2 和环氧化物合成环状碳酸酯。对照实验表明,环加成反应是通过亲核卤化物阴离子与羟基和羧基作为氢键供体的结合来实现的。此外,双功能有机催化剂可以通过简单的过滤轻松回收5次;然而,观察到活性丧失。
An in situ formed Ca<sup>2+</sup>–crown ether complex and its use in CO<sub>2</sub>-fixation reactions with terminal and internal epoxides
作者:J. Steinbauer、A. Spannenberg、T. Werner
DOI:10.1039/c7gc01114h
日期:——
Calcium punched beyond its weight: An in situ formed Ca2+–crown ether complex showed unprecedented efficiency in cyclic carbonate synthesis.
钙超出了其重量范围:一种原位形成的Ca2+–冠醚复合物在环状碳酸酯合成中表现出前所未有的效率。
Polystyrene-supported bifunctional resorcinarenes as cheap, metal-free and recyclable catalysts for epoxide/CO<sub>2</sub> coupling reactions
作者:T. Jose、S. Cañellas、M. A. Pericàs、A. W. Kleij
DOI:10.1039/c7gc02856c
日期:——
We here report the synthesis of bifunctional catalysts that can be assembled using simple, cheap and accessible building blocks based on resorcinarenes, and their application as efficient, one-component homogeneouscatalysts in the coupling of both terminal and internal epoxides with carbondioxide affording their cyclic carbonate products. Furthermore, a heterogeneous version was also prepared that
Computer-aided rational design of Fe(<scp>iii</scp>)-catalysts for the selective formation of cyclic carbonates from CO<sub>2</sub> and internal epoxides
were derived and first tested using computer models based on density functional theory. The most promising candidate that was identified in the computer model was then prepared and found to display significantly enhanced reactivity towards forming the cyclic carbonates, supporting the validity of the mechanistic insights deduced from the computer simulations. We propose that the cyclic carbonate is formed