Rational selection of the cation of an ionic liquid to control the reaction outcome of a substitution reaction

2018 ◽  
Vol 54 (18) ◽  
pp. 2296-2299 ◽  
Author(s):  
Rebecca R. Hawker ◽  
Ronald S. Haines ◽  
Jason B. Harper
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Rate Constant ◽  
Substitution Reaction ◽  
Rational Selection ◽  
Substitution Process ◽  
Selection Of

Rational selection of ionic liquids to get the rate constant you want in a substitution process.

Effect of Modifying the Anion of an Ionic Liquid on the Outcome of an SN2 Process

2015 ◽  
Vol 68 (1) ◽  
pp. 31 ◽  
Author(s):  
Sinead T. Keaveney ◽  
Dominic V. Francis ◽  
Winnie Cao ◽  
Ronald S. Haines ◽  
Jason B. Harper
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Rate Constant ◽  
Kinetic Data ◽  
Activation Parameters ◽  
Temperature Dependent ◽  
Substitution Process

The effect of a series of ionic liquids containing different anions (bis(trifluoromethanesulfonyl)imide, dicyanimide, hexafluorophosphate, tetrafluoroborate, and bromide) on the rate constant of a bimolecular substitution process was investigated. A general ionic liquid effect was noted, with increases in the rate constant observed in all ionic liquids used when compared with that in acetonitrile. Temperature-dependent kinetic data allowed calculation of activation parameters in each of the reaction mixtures considered; these parameters showed that the microscopic origins of the rate enhancements observed were not the same for all of the ionic liquids used, demonstrating the importance of the nature of the anion.

Understanding the effects of ionic liquids on a unimolecular substitution process: correlating solvent parameters with reaction outcome

2019 ◽  
Vol 17 (3) ◽  
pp. 675-682 ◽  
Author(s):  
Alyssa Gilbert ◽  
Ronald S. Haines ◽  
Jason B. Harper
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Rate Constant ◽  
Solvent Parameters ◽  
Substitution Process

The polarisability of an ionic liquid is key in determining the rate constant of a unimolecular substitution process.

Rapid relaxation NMR measurements to predict rate coefficients in ionic liquid mixtures. An examination of reaction outcome changes in a homologous series of ionic liquids

2021 ◽  
Author(s):  
Daniel C Morris ◽  
Stuart W Prescott ◽  
Jason B Harper
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Homologous Series ◽  
Rate Coefficient ◽  
Liquid Mixtures ◽  
Solvent Mixture ◽  
Rate Coefficients ◽  
Substitution Process

A series of ionic liquids based on the 1-alkyl-3-methylimidazolium cations were examined as components of the solvent mixture for a bimolecular substitution process. The effects on both the rate coefficient...

Controlling the reactions of 1-bromogalactose acetate in methanol using ionic liquids as co-solvents

2020 ◽  
Vol 18 (28) ◽  
pp. 5442-5452 ◽  
Author(s):  
Alyssa Gilbert ◽  
Ronald S. Haines ◽  
Jason B. Harper
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Rate Constant ◽  
Solvent Mixture ◽  
Solvent Composition ◽  
Composition Changes

Using an ionic liquid in the solvent mixture for the reaction of a galactose substrate leads to changes in both the rate constant and the products as the solvent composition changes.

scholarly journals Experimental investigations on electrorheological properties of lubricating oils containing ionic liquid. Part. 1. Investigations with modified Brookfield DV-III Ultra Viscosimeter

2019 ◽  
Vol 68 (3) ◽  
pp. 35-63
Author(s):  
Jarosław Juda ◽  
Tomasz Jan Kałdoński ◽  
Tadeusz Kałdoński
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Electric Fields ◽  
Experimental Investigations ◽  
Lubricating Oils ◽  
Liquid Part ◽  
Special Stand ◽  
Electrorheological Properties ◽  
Selection Of

The results of experimental investigations on electrorheological (ER) properties of lubricating oils which contain ionic liquids, are presented in this article. The investigations were carried out on the special stand which was projected for this aim. On this stand there was used the modified Brookfield viscosimeter. Electrorheological properties of two mixtures were tested, i.e., silicone damping liquid GP-1 which is polimethylsiloksane mixture containing 2% (v/v) of ionic liquid CJ 001, i.e., tetrafluoroboran 1-methyl-3-octyloxymethylimidazolium as well as base polialfaolefine oil PAO-6 which contains 2% (v/v) of ionic liquid CJ 008, i.e., trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide. Selection of components of both mixtures was based on the results of investigations of miscible and on evaluation of basic phys-chem properties. The investigations showed that the made mixtures have generated the ER effect, but it was short-lived effect, suggesting the changes of inner structure of these mixtures. Therefore, we have planned the next investigations, among others dielectric spectroscopy and microscope observations in situ of these mixtures in external electric fields. The aim of those investigations will be to record the fading ER effect and to understand this mechanism. Keywords: electrorheological effect, homogenous mixtures, lubricants, ionic liquids

Preliminary Assessment of the Sorption of some Alkyl Imidazolium Cations as used in Ionic Liquids to Soils and Sediments

2005 ◽  
Vol 58 (3) ◽  
pp. 170 ◽  
Author(s):  
Piotr Stepnowski
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Environmental Fate ◽  
Hydrophobic Interactions ◽  
Preliminary Assessment ◽  
Imidazolium Ionic Liquid ◽  
Imidazolium Cations ◽  
Soils And Sediments ◽  
Essential Parameter ◽  
Selection Of

The growing interest in the use of ionic liquids may soon result in their presence in the environment. In any evaluation of the environmental fate of these compounds, their sorption on soil is an essential parameter. This paper reports data on the sorption of ionic liquids on selected soils and marine sediments. Batch-equilibrium adsorption tests were conducted on a selection of imidazolium ionic liquid entities. All the compounds were strongly sorbed on all the soils under study. It seems that, regardless of the hydrophobic interaction with organic matter, non-hydrophobic interactions contribute to the sorption of these compounds to soils and sediments, which usually tends to occur with highly polar ionized groups such as quaternary moieties.

Correlating ionic liquid solvent effects with solvent parameters for a reaction that proceeds through a xanthylium intermediate

2019 ◽  
Vol 17 (42) ◽  
pp. 9336-9342 ◽  
Author(s):  
Alyssa Gilbert ◽  
Götz Bucher ◽  
Ronald S. Haines ◽  
Jason B. Harper
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Rate Constant ◽  
Solvent Effects ◽  
Solvent Parameters

The effects of ionic liquids on the rate constant of an SN1 process with a xanthylium intermediate differ from those observed for other SN1 reactions. These effects can be correlated to solvent parameters of the ionic liquids allowing predictability.

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