Bifunctional One-Component Catalysts for the Addition of Carbon Dioxide to Epoxides
作者:Hendrik Büttner、Kornelia Lau、Anke Spannenberg、Thomas Werner
DOI:10.1002/cctc.201402816
日期:2015.2
Several bifunctional ammonium salts were synthesized and employed as one‐component catalysts for the conversion of CO2 and epoxides to produce cyclic carbonates. These catalysts show superior activities compared to their monofunctional analogs. A turnover number of up to 693 and a turnover frequency of up 392 h−1 could be achieved for the best catalyst. Moreover, the effect of various solvents has
合成了几种双功能铵盐,并将其用作单组分催化剂,用于将CO 2和环氧化物转化为环状碳酸酯。与它们的单官能类似物相比,这些催化剂显示出优异的活性。周转次数最多为693,周转频率最多为392 h -1可以达到最佳催化剂的效果。此外,已经研究了各种溶剂的作用。所有使用的溶剂和形成的产物对底物转化率都有负面影响。对于两种常规反应方案,分别在45和90°C下仔细研究了反应的范围和限制。在超过20个示例中,过滤后的分离产率为90%。此外,我们提出了环己烯基天然存在的环状碳酸酯的首次有机催化合成,其分子结构由XRD确定。此外,我们证明了该反应甚至可以在数克范围内进行,并且可以通过原位FTIR光谱进行监测。
Microwave-Assisted Synthesis of Tris-Anderson Polyoxometalates for Facile CO<sub>2</sub> Cycloaddition
作者:Wei-Dong Yu、Yin Zhang、Yu-Yang Han、Bin Li、Sai Shao、Le-Ping Zhang、Hong-Ke Xie、Jun Yan
DOI:10.1021/acs.inorgchem.1c00019
日期:2021.3.15
(NH4)4[ZnMo6O18(C4H8NO3)(OH)3]·4H2O (1), (NH4)4[CuMo6O18(C4H8NO3)(OH)3]·4H2O (2), (TBA)3(NH4)[ZnMo6O17(C5H9O3)2(OH)]·10H2O (3) (TBA = n-C16H36N), and (NH4)4[CuMo6O18(C5H9O3)2]·16H2O (4), were synthesized by a microwave-assisted method. Single-crystal X-ray diffraction revealed that 1 and 2 contained a tris (trihydroxyl organic compounds) ligand grafted on one side, while two tris ligands were grafted on two sides to
四个新的tris-Anderson多金属氧酸盐(POMs)(NH 4)4 [ZnMo 6 O 18(C 4 H 8 NO 3)(OH)3 ]·4H 2 O(1),(NH 4)4 [CuMo 6 O 18(C 4 H 8 NO 3)(OH)3 ]·4H 2 O(2),(TBA)3(NH 4)[ZnMo 6 O 17(C 5 H 9 O 3)2(OH)]·10H 2 O(3)(TBA = n -C 16 H 36 N)和(NH 4)4 [CuMo 6 O 18(C 5 H 9 O 3)2 ]·16H 2 O (4)是通过微波辅助法合成的。X射线单晶衍射表明,1和2的一侧接有一个tris(三羟基有机化合物)配体,而两侧的两个tris配体接枝了,在3和3中形成χ/δ和δ/δ异构体。分别为4。首次获得χ/δ异构体3的1 H和13 C NMR光谱,其中6个亚甲基在1 H NMR光谱中显示6个峰,在13
Post-modified porphyrin imine gels with improved chemical stability and efficient heterogeneous activity in CO<sub>2</sub> transformation
Gel catalysts have been developed based on dynamic covalent chemistry and post-modification methods for improved chemical stability and catalytic activity.
已经开发出基于动态共价化学和后修饰方法的凝胶催化剂,以改善化学稳定性和催化活性。
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
Niobium(<scp>v</scp>) chloride and imidazolium bromides as efficient dual catalyst systems for the cycloaddition of carbon dioxide and propylene oxide
作者:Michael E. Wilhelm、Michael H. Anthofer、Robert M. Reich、Valerio D'Elia、Jean-Marie Basset、Wolfgang A. Herrmann、Mirza Cokoja、Fritz E. Kühn
DOI:10.1039/c3cy01057k
日期:——
The application of niobium(V) chloride and several imidazolium bromides as catalyst systems for the cycloaddition of propyleneoxide (PO) with carbon dioxide to propylene carbonate (PC) is reported. A set of 31 different imidazolium bromides has been synthesized with varying substituents at all five imidazolium ring atoms, of which 17 have not been reported before. The impact of different substitution