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

合成了一种C_1和C_4‘羟基是自由的，其余的都是由苯基保护的纤维二糖衍生物。它被环合在C1和C4‘羟基之间，得到了一种新的环状二糖衍生物，它的脱水作用桥接在一个双糖中的不同糖残基上。以五氟化氢为引发剂，对环状纤维二糖衍生物进行阳离子聚合，得到数均相对分子质量为1.4×104的聚合物。目前，由于转化率低，所得聚合物的化学结构尚不清楚。本工作提供了一种独特的环二糖开环聚合合成多糖类的新方法，将重复糖基延长了两个单位。

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.