Abstract
Ionic liquids were prepared via hydrothermal decarboxylation of zwitterionic imidazolium compounds derived from amino acids and carbohydrate related dicarbonyl compounds. Two of these ionic liquids were used successfully as solvents in the Heck reaction and for the dissolution of cellulose.
Highlights
Ionic liquids were prepared via hydrothermal decarboxylation of zwitterionic imidazolium compounds derived from amino acids and carbohydrate related dicarbonyl compounds
Imidazolium moieties are found in a variety of fine chemicals, and in recent years they played a prominent role within the field of ionic liquids (ILs)
We recently reported the sustainable synthesis of a small library of homosubstituted imidazolium zwitterions (IMzw) based on a modification of the Debus–Radziszewski reaction, in which amino acids are incorporated into the imidazolium ring via the amino group.[5]
Summary
Hydrothermal processes have gained interest as convenient and green methods for the processing of biomass[7] with interesting advantages as reaction media for the upgrading of cellulose[8] and fatty acids.[9] In addition, continuous processing has been recognised by fine chemical manufacturers as one of the major opportunities to improve the sustainability of industrial syntheses.[10] Microreactors enable more efficient mixing and heat transfer, thereby reducing reaction times and increasing safety They allow for working in the near- and supercritical regions, which opens up new possibilities for green synthesis, making use of the unique properties of benign solvents such as water under these conditions.[11].
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