66675-43-2Relevant articles and documents
Synthesis of cyclic carbonate from carbon dioxide and epoxide using amino acid ionic liquid under 1atm pressure
Gong, Qing,Luo, Huadong,Cao, Jin,Shang, Yuhan,Zhang, Haibo,Wang, Wenjing,Zhou, Xiaohai
, p. 381 - 386 (2012)
Herein, we report an effective synthesis of cyclic carbonates by cycloaddition of carbon dioxide to epoxide using a modified amino acid ionic liquid as catalyst under 1atm pressure. With triethylamine as co-catalyst, the catalytic activity of the l-proline based ionic liquid was greatly enhanced, and up to 97% isolated yield of cyclic carbonate was achieved at 90C under atmospheric pressure without organic solvent and metal component.
Diethylene Glycol/NaBr Catalyzed CO2 Insertion into Terminal Epoxides: From Batch to Continuous Flow
Rigo, Davide,Calmanti, Roberto,Perosa, Alvise,Selva, Maurizio,Fiorani, Giulia
, p. 2005 - 2016 (2021/02/27)
CO2 insertion reactions on terminal epoxides (styrene oxide, 1,2-epoxyhexane and butyl glycidyl ether) were performed in a binary homogeneous mixture comprising NaBr as the nucleophilic catalyst and diethylene glycol (DEG) as both solvent and catalyst activator (cation coordinating agent). The reaction protocol was initially studied under batch conditions either in autoclaves and glass reactors: quantitative formation of the cyclic organic carbonate products (COCs) were achieved at T=100 °C and p0(CO2)=1–40 bar. The process was then transferred to continuous-flow (CF) mode. The effects of the reaction parameters (T, p(CO2), catalyst loading, and flow rates) were studied using microfluidic reactors of capacities variable from 7.85 ? 10?2 to 0.157 cm3. Albeit the CF reaction took place at T=220 °C and 120 bar, CF improved the productivity and allowed catalyst recycle through a semi-continuous extraction procedure. For the model case of 1,2-epoxyhexane, the (non-optimized) rate of formation of the corresponding carbonate, 4-butyl-1,3-dioxolan-2-one, was increased up to 27.6 mmol h?1 equiv.?1, a value 2.5 higher than in the batch mode. Moreover, the NaBr/DEG mixture was reusable without loss of performance for at least 4 subsequent CF-tests.
Metalated-bipyridine-based porous hybrid polymers with POSS-derived Si-OH groups for synergistic catalytic CO2fixation
Zhang, Yadong,Luo, Niu,Xu, Jingyu,Liu, Ke,Zhang, Shengqi,Xu, Qinglin,Huang, Rui,Long, Zhouyang,Tong, Minman,Chen, Guojian
, p. 11300 - 11309 (2020/09/02)
Herein, we construct a new series of N-heterocyclic ligand bipyridine-based porous hybrid polymers (denoted Bpy-PHPs) from the Heck reaction of a rigid building unit octavinylsilsesquioxane (VPOSS) and 5,5′-dibromo-2,2′-bipyridine. Surprisingly, the typical sample Bpy-PHP-4 was found to be a metal-/halogen-free heterogeneous catalyst in the cycloaddition reaction of CO2 with a few epoxides under atmospheric pressure. After coordination with ZnBr2, the resultant ZnBr2@Bpy-PHP-4 afforded largely enhanced heterogeneous catalytic activities upon the conversion of carbon dioxide (CO2) and various epoxides into cyclic carbonates without using any co-catalysts under mild conditions. The moderate catalytic activities of Bpy-PHP-4 may be due to the presence of hydrogen bond donors (HBDs), i.e., polyhedral oligomeric silsesquioxane (POSS)-derived Si-OH groups and N active sites from Bpy linkers. In comparison, the high catalytic efficiency of ZnBr2@Bpy-PHP-4 should be attributed to the synergistic catalysis of Si-OH groups, N active atoms, and Bpy-coordinated ZnBr2. Moreover, the catalyst ZnBr2@Bpy-PHP-4 can be easily recovered and reused ten times without any significant loss of catalytic activities. This work affords an efficient metal-based porous hybrid polymer heterogeneous catalyst for the cycloaddition reaction of CO2 and epoxides under mild and co-catalyst-free conditions.
Method for chemically fixing carbon dioxide to synthesize cyclic carbonate under normal temperature and normal pressure condition of eutectic ionic liquid (by machine translation)
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Paragraph 0030; 0039; 0041, (2019/07/16)
The method uses carbon dioxide and different substituent epoxy compounds as raw materials, adopts quaternary phosphonium bromide salt, aminophenol according to molar ratio ?timetime?: 3, the reaction pressure of 5%~10% and the reaction temperature of 12~24 unitunitz ?, and the 1:2~1 reaction time ranges hours to synthesize the corresponding cyclic carbonate . the method comprises the following steps: preparing a catalyst, and synthesizing 0.1 mpa the cyclic carbonate by 25 °C using the novel eutectic ionic liquid in a molar ratio of carbon dioxide and different substituted base epoxy compounds. The novel eutectic ionic liquid is simple and efficient in preparation, cheap and accessible in raw materials, excellent in catalytic performance, and capable of realizing high-selectivity synthesis of cyclic carbonate under normal temperature, normal pressure and the like. , The invention avoids the use, the catalyst and the product of the toxic transition metal, the volatile organic solvent and the cocatalyst, and belongs to an environment-friendly catalyst. (by machine translation)
