Reaction of 1-butyl imidazole with 3-bromopropylamine hydrobromide, followed by workup and anion exchange, yields a new room temperature ionic liquid incorporating a cation with an appended amine group. The new ionic liquid reacts reversibly with CO2, reversibly sequestering the gas as a carbamate salt. The new ionic liquid, which can be repeatedly recycled in this role, is comparable in efficiency for CO2 capture to commercial amine sequestering reagents, and yet is nonvolatile and does not require water to function.
The reaction of triphenylphosphine or N-butylimidazole with cyclic sultones gives zwitterions that are subsequently converted into ionic liquids by reaction with trifluoromethane sulfonic acid or p-toluenesulfonic acid. The resulting ionic liquids have cations to which are tethered alkane sulfonic acid groups. These Brønsted acidic ionic liquids are useful solvent/catalysts for several organic reactions, including Fischer esterification, alcohol dehydrodimerization and the pinacol rearrangement. The new ionic liquids combine the low volatility and ease of separation from product normally associated with solid acid catalysts, with the higher activity and yields normally found using conventional liquid acids.
Solvents
SolventsV 2000 Sweet Success: Ionic Liquids Derived from Non-Nutritive Sweeteners. -The anions of the sweeteners saccharin and acesulfame form ionic liquids when paired with a variety of organic cations. -(CARTER, E. B.; CULVER, S. L.; FOX, P. A.; GOODE, R. D.; NTAI, I.; TICKELL, M. D.; TRAYLOR, R. K.; HOFFMAN*, N. W.; DAVIS, J. H. J.; Chem.
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