Abstract
The tautomeric equilibrium
of D-allose in aqueous solution is altered by the
presence of some cations which form complexes with the α-pyranose and the α-furanose
but not with the β-pyranose and the β-furanose forms. Determination of the proportions of the tautomeric
forms by N.M.R. allows a comparison of the complexing ability of cations.
Lanthanum, calcium, and strontium form the strongest complexes. The behaviour of D-lyxose, D-ribose, and D-glycero-D-gulo-heptose on
complexing is described.
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