For polysaccharide synthescs,ring open-ing polymerizatlon of 1,6-,1,4-,1,3-,and 1,2-anhydro sngars,and polycondensation of cya-noethylidene trityl ether sugars are described.

对的合成主了1，6-、1，4-、1，3-、1，2-缩水内醚的离子合制备均，及用原酸酯衍生物通过缩反应制备。