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
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
Effect of hydrogen bond of hydroxyl-functionalized ammonium ionic liquids on cycloaddition of CO2
作者:Weiguo Cheng、Benneng Xiao、Jian Sun、Kun Dong、Peng Zhang、Suojiang Zhang、Flora T.T. Ng
DOI:10.1016/j.tetlet.2015.01.174
日期:2015.3
synergistic effect of the hydrogen bond on the cycloaddition of CO2 and epoxides to form cyclic carbonates was investigated through experimental study and characterization. A highly effective homogeneous system of hydroxyl-functionalized quaternary ammonium ionic liquids with a different number of the hydroxyl group in the cation was developed for the fixation of CO2 to form cyclic carbonates. A mechanism via
Synthesis, Characterization and Catalytic Application of Pyridine-Bridged N-Heterocyclic Carbene-Ruthenium Complexes in the Hydrogenation of Carbonates
作者:Jiangbo Chen、Haibo Zhu、Jinjin Chen、Zhang-Gao Le、Tao Tu
DOI:10.1002/asia.201701303
日期:2017.11.2
synthesized; these exhibited very high catalytic activity in the hydrogenation of cyclic and linear carbonates under mild reaction conditions. In the presence of catalytic amounts of a weakbase, a broad range of substrates with different ring size and steric bulk were well tolerated, providing methanol and the corresponding diols in excellent yields with a catalyst loading as low as 0.5 mol %.
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