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associates. Good peak symmetry and system efficiency for analysis of basic compounds are also achieved by use of mobile phases containing organic amines as silanol blockers. To suppress free silanol groups, an addition of ionic liquids (ILs) to mobile
in aqueous solutions of non-ionic surfactants [ 22 ]. Recently, the use of room temperature ionic liquids (ILs) as alternatives to surfactants or organic solvents has been reported in CPE [ 23 ] methods. ILs are less toxic than organic
Abstract
Transformed from heterogeneous to homogeneous state, an ionic liquid (IL)-based Suzuki coupling reaction was successfully implemented in a continuous microflow system. Triethylamine (Et3N) was introduced as the base, and N-methylpyrrolidinone (NMP) was used as the solvent of boronic acid, which brought about the first improvement on the reaction performance. Then, the implementation of this reaction in a continuous microflow system brought about further improvement on the reaction yield and selectivity due to better mixing condition. The combination of IL as the reaction medium and the continuous microflow system as the reactor in this work exhibited great potential for efficient Suzuki coupling reactions.
Abstract
We investigated the features of the glass transition relaxation of two room temperature ionic liquids using DSC. An important observation was that the heat capacity jump, that is the signature of the glass transition relaxation, shows a particularly strong value in this type of new and promising materials, candidates for a range of applications. This suggests a high degree of molecular mobility in the supercooled liquid state. The study of the influence of the heating rate on the temperature location of the glass transition signal, allowed the determination of the activation energy at the glass transition temperature, and the calculation of the fragility index of these two ionic glass-formers. It was concluded that this kind of materials belong to the class of relatively strong glass-forming systems.
Introduction Ionic liquids have received considerable attention recently for their wide range of applications, which are invariably possible due to attractive physical and chemical properties of these materials [ 1 – 5 ]. These
Introduction As green solvents, ionic liquids especially air and water stable ionic liquids have gained great attention [ 1 – 3 ]. In recent decades, the study of ionic liquids is focused on the chemical reaction and separation
alternative solvents for separations, chemical synthesis, electrochemistry and catalysis. Generally, they are nonvolatile, non-explosive, recyclable, easy to handle and thermally robust. The work on deep desulfurization by ionic liquids was well summarized in
Introduction Ionic liquids (ILs) have a widespread use in many areas of chemistry due to features of first-rate chemical and thermal stabilities, good electronic and ionic conductivities and ability to dissolve a great variety
and 43% ee% for α-methylstyrene. It would be of interest if we could shorten the reaction time and improve the enantioselectivity of the asymmetric reaction without the use of volatile organic solvent. Room temperature ionic liquids (RTILs) are
