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Updated: May 5, 2026

Separation of Aldehydes and Reactive Ketones from Mixtures Using a Bisulfite Extraction Protocol
Published on: April 2, 2018
Green chemistry: reversible nonpolar-to-polar solvent
Philip G Jessop1, David J Heldebrant, Xiaowang Li
1Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada. jessop@chem.queensu.ca
Abstract:
Imagine a smart solvent that can be switched reversibly from a liquid with one set of properties to another that has very different properties, upon command. Here we create such a system, in which a non-ionic liquid (an alcohol and an amine base) converts to an ionic liquid (a salt in liquid form) upon exposure to an atmosphere of carbon dioxide, and then reverts back to its non-ionic form when exposed to nitrogen or argon gas. Such switchable solvents should facilitate organic syntheses and separations by eliminating the need to remove and replace solvents after each reaction step.
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