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- W4247917308 abstract "Cyclitols and sugars containing an axial-equatorial-axial sequence of three hydroxyl groups in a six-membered ring, or a cis-cis sequence in a five-membered ring, form 1:1 complexes with metal cations in hydroxylic solvents. At least one of the hydroxyl groups can be replaced by a methoxy group without substantially affecting complex formation. Lanthanum(III) forms the strongest complexes (K about 10 mol−11 in water), followed by calcium and strontium. Complex formation causes downfield shifts of the signals in the p.m.r. spectrum, that of the hydrogen atom vicinal to the oxygen atom central in the ax-eq-ax sequence being the largest. Complex formation will change the conformational equilibrium of methyl β-D-ribopyranoside and β-D-lyxopyranose; it will change the anomeric equilibrium of allose, gulose, ribose, and lyxose. It will also alter the equilibrium in methanol between the methyl glycosides of the above-mentioned sugars; in the presence of calcium or strontium chlorides, methyl glycosides can be synthesized which normally are only minor products of methanolysis. Complex formation makes possible the separation of some sugars by electrophoresis and on ion-exchange columns." @default.
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- W4247917308 date "1973-01-01" @default.
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- W4247917308 title "COMPLEX FORMATION BETWEEN SUGARS AND METAL IONS" @default.
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- W4247917308 doi "https://doi.org/10.1016/b978-0-408-70525-7.50005-7" @default.
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