Ionic Liquids-New "Solutions" for Transition Metal Catalysis.
Peter Wasserscheid,Wilhelm Keim +1 more
5.7K
TL;DR: There are indications that switching from a normal organic solvent to an ionic liquid can lead to novel and unusual chemical reactivity, which opens up a wide field for future investigations into this new class of solvents in catalytic applications.
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Abstract: Ionic liquids are salts that are liquid at low temperature (<100 degrees C) which represent a new class of solvents with nonmolecular, ionic character. Even though the first representative has been known since 1914, ionic liquids have only been investigated as solvents for transition metal catalysis in the past ten years. Publications to date show that replacing an organic solvent by an ionic liquid can lead to remarkable improvements in well-known processes. Ionic liquids form biphasic systems with many organic product mixtures. This gives rise to the possibility of a multiphase reaction procedure with easy isolation and recovery of homogeneous catalysts. In addition, ionic liquids have practically no vapor pressure which facilitates product separation by distillation. There are also indications that switching from a normal organic solvent to an ionic liquid can lead to novel and unusual chemical reactivity. This opens up a wide field for future investigations into this new class of solvents in catalytic applications.
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Citations
Fifteen Years of Supported Ionic Liquid Phase-Catalyzed Hydroformylation: Material and Process Developments
TL;DR: In this article, the development of supported ionic liquid phase (SILP) materials as novel hydroformylation catalysts is described, where the solid SILP catalysts have been improved with respect to activity, selectivity and stability.
81
Diamino protic ionic liquids for CO2 capture
TL;DR: A series of multifunctional protic ionic liquids (PILs), some of which are based on a combination of primary and tertiary amines in the same moiety coupled with a carboxylic acid, have been synthesised and employed for CO2 capture, yielding absorption capacities comparable to standard absorbents.
80
Self-associated, "distillable" ionic media.
TL;DR: Liquid or low melting association products of carbon dioxide and a secondary amine, both neutral molecules that may be gaseous, are recognised as "distillable" ionic media.
Liquid Crystalline Phases Self-Organized from a Surfactant-like Ionic Liquid C16mimCl in Ethylammonium Nitrate
TL;DR: Both the imidazolium ring structure and alkyl chain of C(16)mimCl molecule are proved to play important roles for the LC phase formation, and the obtained intuitive three-dimensional (3D) models can help to understand the self-assembled structures.
80
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Room temperature ionic liquids as novel media for ‘clean’ liquid–liquid extraction
Jonathan G. Huddleston,Heather D. Willauer,Richard P. Swatloski,Ann E. Visser,Robin D. Rogers +4 more
TL;DR: The partitioning of simple substituted-benzene derivatives between water and the room temperature ionic liquid, butylmethylimidazolium hexafluorophosphate, is based on the solutes' charged state or relative hydrophobicity as discussed by the authors.
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