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Powder-to-powder polycondensation of natural saccharides. Facile preparation of highly branched polysaccharides



Powder-to-powder polycondensation of natural saccharides. Facile preparation of highly branched polysaccharides



Organic & Biomolecular Chemistry 3(9): 1746-1750



Solid-state polycondensation of a natural saccharide was found to take place in the presence of H3PO4(5 mol%) at 110 degrees C under a N2 flow, giving a highly branched polysaccharide (conv. 11-84%, Mw = 1400-19000, Mn = 1200-3700); the reaction mixture was powdery throughout the polymerization. Interestingly, alpha- and beta-anomers showed different polymerization behaviour; the former was polymerized more slowly, however, they gave comparable molecular weight polymers. The polysaccharide product was per-O-methylated and subjected to structure analyses. The acid-hydrolysis products, the partially O-methylated monosaccharides, suggested that the polysaccharide products have highly branched structures. MALDI-TOF mass analysis revealed that intramolecular glycosylation and acetal exchange reactions are involved in the polymerization mechanism.

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Accession: 049968001

Download citation: RISBibTeXText

PMID: 15858659

DOI: 10.1039/b418723g



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