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Complexation of amino sugars with cobalt(III)bis(phenanthroline)

Authors
Journal
Carbohydrate Research
0008-6215
Publisher
Elsevier
Publication Date
Volume
312
Issue
4
Identifiers
DOI: 10.1016/s0008-6215(98)00242-0

Abstract

Abstract Complexes of Co(III)bis(phenanthroline) with β- d-mannosamine and α- d-galactosamine can be isolated as the triiodide salts. The complex with d-mannosamine has the Δ-configuration at Co(III). Complexation with d-galactoamine gives the Δ- in excess over the Λ- complex, and the Δ-complex can be isolated chromatographically. Complexation involves cis-1-OH and 2-NH 2 groups, eq, ax respectively with β-mannosamine and ax, eq respectively, with α-galactosamine, as with α-glucosamine, based on 1H NMR spectra. Galactosamine complexes in aqueous solution decompose to the free sugar, but the mannosamine complex is much more stable.

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