Silver tungstate: a single-component bifunctional catalyst for carboxylation of terminal alkynes with CO<sub>2</sub> in ambient conditions
作者:Chun-Xiang Guo、Bing Yu、Jia-Ning Xie、Liang-Nian He
DOI:10.1039/c4gc01638f
日期:——
The ligand-free carboxylation of various terminal alkynes promoted by Ag2WO4 was conducted at room temperature and verified with 13CO2.
各种末端炔烃的无配体羧化反应在室温下由Ag2WO4促进,并通过13CO2验证。
Copper(0) Nanoparticles Supported on Al2O3 as Catalyst for Carboxylation of Terminal Alkynes
作者:Grigoriy N. Bondarenko、Ekaterina G. Dvurechenskaya、Eldar Sh. Magommedov、Irina P. Beletskaya
DOI:10.1007/s10562-017-2127-0
日期:2017.10
The copper particles, supported on Al2O3 were for the first time used as heterogeneous, highly active, easily available, and recyclable coppercatalyst of direct carboxylation of various terminal alkynes with CO2 (2 bar) in the presence of cesium carbonate, allowing for the synthesis of alkyl 2-alkynoates. The catalyst contains large-scale CuNPs covered by oxide layer and less prone to erosion, resulting
Carboxylation of terminal alkynes at ambient CO2 pressure in ethylene carbonate
作者:Bing Yu、Zhen-Feng Diao、Chun-Xiang Guo、Chun-Lai Zhong、Liang-Nian He、Ya-Nan Zhao、Qing-Wen Song、An-Hua Liu、Jin-Quan Wang
DOI:10.1039/c3gc40896e
日期:——
The CuI-catalyzed carboxylation of terminal alkynes with CO2 and alkyl halides using ethylene carbonate as the solvent under mild conditions was studied. DFT calculations reveal that the energy barrier for CO2 insertion into the sp-hybridized Cu–C bond could be reduced by employing ethylene carbonate as the solvent. Notably, the procedure was conducted under ambient CO2 pressure without any external ligands. A broad range of substrates with electron-withdrawing groups or electron-donating groups gave the corresponding products in reasonable yields.
An efficient coupling of terminal alkynes and CO2 in the presence of alkyl halides can be achieved under ambient conditions using a copper/phosphine catalyst system, providing facile access to a variety of functionalised alkyl 2-alkynoates.
Copper(I)-based ionic liquid-catalyzed carboxylation of terminal alkynes with CO2 at atmospheric pressure
作者:Jia-Ning Xie、Bing Yu、Zhi-Hua Zhou、Hong-Chen Fu、Ning Wang、Liang-Nian He
DOI:10.1016/j.tetlet.2015.11.028
日期:2015.12
An ionic liquid containing copper(I) proved to be an effective homogeneous catalyst for the carboxylation of terminal alkynes with ambient CO2. This developed procedure needs no external ligands and terminal alkynes with various groups proceeded smoothly at atmospheric CO2 pressure and room temperature. Interestingly, the ILs containing copper(I) in both the anion and the cation showed much higher