Synthesis of Polysaccharides Elongating Main Chain by Two Repeating Units by Means of Ring-Opening Polymerization

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A cellobiose derivative whose C1 and C4' hydroxyl groups are freeand others are protected with benzyl groups was synthesized. It was cyclized between the C1 and C4' hydroxyl groups to give a new cyclic disaccharide derivative bearing an anhydroring bridged over different sugar residues in one disaccharide. The cyclic cellobiosederivative was polymerized cationically with pentafluoride as an initiator to give a polymer with a number-average molecular weight of 1.4×10^4. Currently, chemical structure of the resulting polymer is still unclear because of low conversion. This work provided a new synthetic method of polysaccharides by ring-opening polymerization of unique cyclicdisaccharides, which elongates the repeating sugar residue by two units.