Carboxylate-Assisted Formation of Alkylcarbonate Species from CO<sub>2</sub>and Tetramethylammonium Salts with a<i>β</i>-Amino Acid Anion
作者:Sung Yun Hong、Youngeun Cheon、Seung Hoon Shin、Hyunjoo Lee、Minserk Cheong、Hoon Sik Kim
DOI:10.1002/cssc.201200971
日期:2013.5
Tetramethylammonium‐based molten salts bearing a β‐amino acid anion (TMAAs) are synthesized through Michael addition reactions of amines with methyl acrylate followed by hydrolysis and subsequent neutralization by using aqueous tetramethylammonium hydroxide. The CO2 capture performances of the TMAAs are evaluated and are shown to interact with CO2 in a 1:1 mode in both water and alcohol. FTIR and 13C NMR
通过胺与丙烯酸甲酯的迈克尔加成反应,然后水解并随后通过使用氢氧化四甲铵水溶液进行中和,可以合成带有β-氨基酸阴离子(TMAAs)的基于四甲铵的熔融盐。评估了TMAA的CO 2捕集性能,并显示它们在水和酒精中均以1:1模式与CO 2相互作用。FTIR和13个上TMAAs与CO的相互作用C NMR光谱研究2表明,CO的类型2加合物随所用溶剂的不同而不同。当使用水作为溶剂时,会生成碳酸氢根物质,而在乙二醇和甲醇中分别生成碳酸羟乙酯和碳酸甲酯。计算结果表明,TMAA的羧基通过与氨基氢原子的氢键相互作用,有助于1:1 CO 2加合物的形成和稳定化。
Epoxidation of Alkenes with Aqueous Hydrogen Peroxide and Quaternary Ammonium Bicarbonate Catalysts
作者:Jerrik Mielby、Søren Kegnæs
DOI:10.1007/s10562-013-1088-1
日期:2013.11
AbstractA range of solid and liquid catalysts containing bicarbonate anions were synthesised and tested for the epoxidation of alkenes with aqueoushydrogenperoxide. The combination of bicarbonate anions and quaternary ammonium cations opens up for new catalytic systems that can help to overcome challenges with catalyst separation and reuse. Graphical Abstract
Process for the manufacture of alkylene carbonates
申请人:Montedison S.p.A.
公开号:US04226778A1
公开(公告)日:1980-10-07
A new process is disclosed for the synthesis of alkylene carbonates having from 2 to 4 carbon atoms in the chain, starting from a corresponding halohydrin having the formula: ##STR1## wherein R.sub.a, R.sub.b, R.sub.c and R.sub.d are independently hydrogen or alkyl, aryl, alkylaryl or arylalkyl radicals and where X is a halogen, characterized in that said halohydrin is reacted with a bicarbonate of a quaternary -onium compound, where "-onium" means ammonium, phosphonium, arsonium or stibonium, preferably using an organic solvent as diluent and operating in the presence of carbon dioxide.
Synthesis, Structure, and Spectral Properties of Mixed Uranyl Hydroxonitrate Complexes [(CH3)4N]2[(UO2)2(NO3)4(OH)2] and (HMeIm)2[(UO2)2(NO3)4(OH)2] (MeIm = 1-Methylimidazole)
作者:A. A. Shiryaev、A. M. Fedoseev、M. S. Grigor’ev、A. A. Averin
DOI:10.1134/s1066362218050053
日期:2018.9
The structure and spectroscopic properties of two mixed-ligand uranyl complexes, [(CH3)4N]2· [(UO2)2(NO3)4(OH)2] and [(UO2)2(NO3)4(H2O)2]·2Im (Im = imidazole), were studied by single crystal X-ray diffraction and by vibrational and photoluminescence spectroscopy. The previously made assumption that the latter compound contains electrically neutral complexes [(UO2)2(NO3)4(H2O)2] was found to be erroneous;
Anion Effect on the Current Efficiency During the Preparation of Tetramethylammonium Hydroxide Solution by Electrolysis
作者:Osamu Yagi、Shumpei Shimizu
DOI:10.1246/cl.1994.1683
日期:1994.9
Tetramethylammonium hydroxide (TMAH) of high quality without corrosive ions were prepared by the electrolysis of the solution containing tetramethylammonium hydrogencarbonate (TMAC). Currentefficiency varies by the anion of the tetramethylammonium salts and best with hydrogencarbonate among sulfate, chloride, and formate salts.