S. Hirano, N. Kashimura, N. Kosaka
May 1, 1972
Citations
0
Influential Citations
9
Citations
Journal
Polymer
Abstract
Abstract Phosphorus pentoxide-dimethyl sulphoxide (P 4 O 10 -DMSO) was found predominantly to catalyse the polymerization reaction of carbohydrates at below 35°C and the oxidation reaction at 60–65°C. A series of new synthetic polysaccharides were prepared from mono- and oligo-saccharides including 2-acetamido-2-deoxy- d -glucose and hexuronic acids in up to 48% yield by the action of P 4 O 10 -DMSO at 10–25°C. These synthetic polysaccharides showed s 20,w 0.68–1.34S, and the degree of polymerization fell in 15.3–4.7 monosaccharide units per polysaccharide chain on the basis of reducing end-group assay. A structural analysis by the methylation of the synthetic glucan (2) revealed α-1,4- and α-1,6-glucosidic linkages as main chains with various branchings. The synthetic polysaccharides contained 1.3–15.9% phosphorus, but the linkages are unknown.