13C Nuclear Magnetic Resonance Spectra and the Tautomeric Equilibriums of Ketohexoses in Solution

Larry Que, Gary R. Gray

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111 Scopus citations

Abstract

The proportions of pyranose and furanose forms at equilibrium in aqueous solutions of L-sorbose, D-fructose, D-tagatose, and D-psicose have been determined by 13C nuclear magnetic resonance spectroscopy. The assignments of the 13C resonances were based on a study of configurationally related 1,5-anhydrohexitols and 1,4- and 2,5-anhydropolyols. With the exception of D-psicose, pyranose forms predominate, and the observed conformations and α,β ratios of these forms are in good agreement with values calculated from the interaction energies of nonbonded substituents. The α,β ratios of the furanose forms are determined principally by the geometry of hydroxymethyl and hydroxyl groups at C-2 and C-3. In every case, the C-2 hydroxymethyl group and the C-3 hydroxyl group are trans in the predominant furanose anomer.

Original languageEnglish (US)
Pages (from-to)146-153
Number of pages8
JournalBiochemistry
Volume13
Issue number1
DOIs
StatePublished - Jan 1 1974

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