Recently I am researching about EFFICIENT CATALYST; CARBON-DIOXIDE; CYCLIC CARBONATES; HIGHLY EFFICIENT; SOLVENT; CYCLOADDITION; CONVERSION; ENERGY; APPROXIMATION; ACTIVATION, Saw an article supported by the National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21476061, 21503069, 21676071]; Key Scientific Research Project of Colleges and Universities in Henan Province [18A150024]; Innovation and entrepreneurship Support Project for Minsheng College of He’nan University [MSCXCY2018005, MSCXCY2018006]. Published in ELSEVIER in AMSTERDAM ,Authors: Wang, TF; Ma, Y; Jiang, JM; Zhu, XR; Fan, BW; Yu, GY; Li, NN; Wang, SS; Ren, TG; Wang, L; Zhang, JL. The CAS is 67-51-6. Through research, I have a further understanding and discovery of 3,5-Dimethyl-1H-pyrazole. Quality Control of 3,5-Dimethyl-1H-pyrazole
Lots of ionic liquids have been utilized as catalyst for the coupling reaction of carbon dioxide with epoxides, however, catalyzed conditions could not be regarded as benign, especially when no co-catalyst and/or organic solvent is involved. A series of hydroxyl-functionalized pyrazolium ionic liquids are firstly synthesized. They would efficiently catalyze the cycloaddition of carbon dioxide and propylene oxide under 110 degrees C and 1.0 MPa carbon dioxide initial pressure with 1 mol% catalyst during 4 h resulting in the product yield of 91.2%. The catalytic condition is greatly refined as compared with other single-component ionic liquids with simple anion. Simultaneously, the effect of reaction temperature, amount of catalyst, carbon dioxide initial pressure, and reaction time is explored along with the reusability of catalyst For most of epoxides with terminal substituted group, HEEPzBr presents acceptable catalytic activity. The difference of HEMPzBr, HEEPzBr, and HPEPzBr is also explored by the density functional theory calculations. (C) 2019 Elsevier B.V. All rights reserved.
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Reference:
Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics