Highly Active and Robust Metalloporphyrin Catalysts for the Synthesis of Cyclic Carbonates from a Broad Range of Epoxides and Carbon Dioxide
作者:Chihiro Maeda、Junta Shimonishi、Ray Miyazaki、Jun-ya Hasegawa、Tadashi Ema
DOI:10.1002/chem.201600164
日期:2016.5.4
metalloporphyrins with quaternary ammonium bromides (nucleophiles) at the meta, para, or ortho positions of meso‐phenyl groups were synthesized as catalysts for the formation of cycliccarbonatesfromepoxides and carbondioxide under solvent‐free conditions. The meta‐substituted catalysts exhibited high catalytic performance, whereas the para‐ and ortho‐substituted catalysts showed moderate and low activity
Synthesis of Cyclic Carbonates from Epoxides and Carbon Dioxide by Using Bifunctional One-Component Phosphorus-Based Organocatalysts
作者:Hendrik Büttner、Johannes Steinbauer、Thomas Werner
DOI:10.1002/cssc.201500612
日期:2015.8.24
Numerous bifunctionalorganocatalysts were synthesized and tested for the atom‐efficient addition of carbondioxide and epoxides to produce cyclic carbonates. These catalysts are based on phosphonium salts containing an alcohol moiety in the side chain for substrate activation through hydrogen bonding. In the model reaction, converting 1,2‐butylene oxide with CO2, 19 catalysts were tested to determine
Transfer hydrogenation of cyclic carbonates and polycarbonate to methanol and diols by iron pincer catalysts
作者:Xin Liu、Johannes G. de Vries、Thomas Werner
DOI:10.1039/c9gc02052g
日期:——
as the catalyst for the transfer hydrogenation of cycliccarbonates to methanol and diols. The advantage of this method is the use of isopropanol as the hydrogen source, thus avoiding the handling of flammable hydrogen under high pressure. The reaction offers an indirect route for the reduction of CO2 to methanol. In addition, poly(propylenecarbonate) was converted to methanol and propylene glycol
Two birds with one stone: The simultaneous production of two important bulk chemicals, methanol and ethylene glycol, from CO2 and ethylene oxide has been achieved under mild conditions by the highly efficient homogeneous catalytichydrogenation of ethylene carbonate in the presence of a (PNP)RuII catalyst (see scheme).
Cooperative Multifunctional Organocatalysts for Ambient Conversion of Carbon Dioxide into Cyclic Carbonates
作者:Ning Liu、Ya-Fei Xie、Chuan Wang、Shi-Jun Li、Donghui Wei、Min Li、Bin Dai
DOI:10.1021/acscatal.8b01925
日期:2018.11.2
N-heterocyclic carbene precursor and a carboxyl group as proton transfer agent were synthesized and used as organocatalysts for the cycloaddition of epoxides with CO2. In this context, we have demonstrated the high activity of these one-component organocatalysts in the CO2 transformation to cyclic carbonates under ambient conditions (room temperature, 1 bar of CO2). The catalytic potential of these multifunctional
合成了一系列具有N杂环卡宾前体和羧基作为质子转移剂的钳型化合物,并将其用作有机催化剂,用于环氧化物与CO 2的环加成反应。在这种情况下,我们已经证明了这些单组分有机催化剂在环境条件(室温,1 bar CO 2)下从CO 2转化为环状碳酸酯的高活性。这些多功能有机催化剂在具有挑战性的内部环氧化物上的催化潜力特别值得一提,因为能够介导内部环氧化物与CO 2的环加成反应的有机催化剂在温和的条件下仍然稀缺。通过控制实验和DFT计算阐明了分子内的协同激活机制。