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Keywords:

  • biomass conversion;
  • glucose isomerization;
  • NMR spectroscopy;
  • solid Lewis acids;
  • zeolites
Thumbnail image of graphical abstract

Other way round: 1H and 13C NMR spectroscopy on isotopically labeled glucose reveals that in the presence of tin-containing zeolite Sn-Beta, the isomerization reaction of glucose in water proceeds by way of an intramolecular hydride shift (see scheme) rather than proton transfer. This is the first mechanistic demonstration of Sn-Beta acting as a Lewis acid in a purely aqueous environment.