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A multinuclear NMR spectroscopy study of the tungstate and molybdate complexes of d-fructose and l-sorbose

✍ Scribed by Jean-Paul Sauvage; Jean-François Verchère; Stella Chapelle

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
486 KB
Volume
286
Category
Article
ISSN
0008-6215

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✦ Synopsis

The formation of dinuclear tungstate and molybdate complexes of D-fructose and L-sorbose was studied in aqueous solution by I H, ~3C, and ~83W NMR spectroscopy. These ketoses react only in acyclic forms, because HO-3,4 are trans in the cyclic lbrms. With tungstate, both sugars form a major complex of the same type in which the hydrated ketose is bound through the O-1,2,4 site of chelation. The ligands are tetradentate, since both 0-2 atoms bridge the metal atoms. Complexes of the same type prevail in the molybdate systems, but are accompanied by one (sorbose) or two (fructose) minor complexes formed by the acyclic keto forms in which the sites of chelation are the 0-3,4,5,6 systems. Multinuclear NMR data are provided for the identification of the various types of complexes.

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