Tartrate-based ionic liquids: unified synthesis and characterisation
摘要:
本文介绍了一种制备酒石酸衍生有机盐与大块非配位阳离子的方便而通用的方法。该方法基于酒石酸与阳离子氢氧化物在水溶液中的中和反应。通过系统地改变半酒石酸阴离子或双酒石酸阴离子以及有机阳离子的性质,制备出一系列 24 种酒石酸盐。此外,还将阴离子的手性作为结构改造的载体进行了探索。我们还进行了包括 X 射线晶体学在内的全面表征。通过对这些盐的理化性质进行比较研究,发现了一些有用的趋势,有助于设计适当的酒石酸手性离子液体。
Parallel Microwave-Assisted Synthesis of Ionic Liquids and Screening for Denitrogenation of Straight-Run Diesel Feed by Liquid-Liquid Extraction
作者:Miguel A. Ceron、Diego J. Guzman-Lucero、Jorge F. Palomeque、Rafael Martinez-Palou
DOI:10.2174/138620712800194477
日期:2012.4.1
Fifty-six ionicliquids were efficiently synthesized in parallel format under one-pot, solvent-freemicrowave-assisted synthesis. These compounds were evaluated as extracting agents of nitrogen-containing compounds from a real Diesel feed before being submitted to the hydrodesulfurization process to obtain ultralow sulfur Diesel. Our results showed that halogenated ionicliquids are an excellent alternative
A series of calix[4]arene semitubes (4a–c) having alkyl bridging spacers of different lengths and flexibilities on their lower rim was synthesised and characterised in solution and in the solid state by 1H NMR spectroscopy and X-ray crystallography. The binding properties of these novel ditopic hosts toward a series of N-alkylpyridinium ion pairs were investigated in low polar media by 1H NMR and UV-vis
合成了一系列杯状[4]芳烃半管(4a–c),其下边缘具有不同长度和柔性的烷基桥接间隔基,并通过1 H NMR光谱和X射线晶体学对其进行了溶液化和固态表征。通过1 H NMR和UV-vis光谱在低极性介质中研究了这些新颖的双位宿主对一系列N-烷基吡啶鎓离子对的结合特性,并与相应的杯[4]芳烃单位宿主5进行了比较。这些研究表明,在低极性溶剂中,杯[4]芳烃半管表现为同位宿主,随氮的增加而增加。-烷基吡啶鎓离子对与主客体化学计量比为1:2的超分子加合物。
IONIC ADDITIVE FOR CATALYSIS IN BIPHASIC REACTION SYSTEMS
申请人:Cole-Hamilton David
公开号:US20090318734A1
公开(公告)日:2009-12-24
An additive for improving the rate of catalysis in biphasic reaction systems is disclosed. The additive is an ionic molecule comprising an organic cation such as a heterocyclic compound or a quaternary ammonium or phosphonium cation, and an anion which may be organic or inorganic. A process for improved catalysis in an aqueous biphasic system wherein the catalyst is substantially dissolved in the aqueous phase and the substrate is substantially contained in the non-aqueous phase is also described. A suitable additive is 1-octyl-3-methylimidazolium halide. Examples of suitable catalytic reactions include the hydrogenation, hydrosilation, hydroboration, hydrovinylation, hydroformylation, oxidation and hydroxycarbonylation of alkenes, and Heck, Suzuki, Stille, and Sonigashira coupling.
Aqueous-biphasic hydroformylation of alkenes promoted by “weak” surfactants
作者:Simon L. Desset、Simon W. Reader、David J. Cole-Hamilton
DOI:10.1039/b822139a
日期:——
The aqueous-biphasic hydroformylation of higher alkenes catalyzed by Rh/TPPTS has been carried out in the presence of imidazolium, pyridinium and triethylammonium salts. High reaction rates are achieved with imidazolium and triethylammonium salts provided that their alkyl âtailâ is â¥C8. Fast and complete phase separation, and good retention of the metal in the aqueous phase could be achieved with an octyl âtailâ. Imidazolium salts were found to give the highest rate enhancement. The nature of the anion showed a moderate influence on the reaction. Evidence suggests that the additive can act as weak surfactant allowing emulsions to be formed and broken by simply switching the stirring on and off.
Does alkyl chain length really matter? Structure–property relationships in thermochemistry of ionic liquids
作者:Sergey P. Verevkin、Dzmitry H. Zaitsau、Vladimir N. Emel’yanenko、Ricardas V. Ralys、Andrei V. Yermalayeu、Christoph Schick
DOI:10.1016/j.tca.2013.04.003
日期:2013.6
Abstract DSC was used for determination of reaction enthalpies of synthesis of ionic liquids [Cnmim][Cl]. A combination of DSC with quantum chemical calculations presents an indirect way to study thermodynamics of ionic liquids. The indirect procedure for vaporization enthalpy was validated with the direct experimental measurements by using thermogravimetry. First-principles calculations of the enthalpy