以L—丝氨酸为原料,合成了旋光纯度很高的4(S)—2—甲基—4—甲氧羰基—2—噁唑啉单体。该化合物在对甲基苯磺酸、硫酸二甲酯等引发剂作用下进行正离子开环聚合,获得了具有光学活性的聚合物。结构分析表明,产物具有两种类型的结构,反应温度以及引发剂用量对这两种结构成份的相对含量有影响。对开环聚合机理进行了初步探讨。 Starting from L-serine, 4 (S) -2-methyl-4-methoxycarbonyl-2-oxazoline monomer with high optical purity was synthesized. The compound is subjected to positive ion ring-opening polymerization under the action of an initiator such as p-toluenesulfonic acid and dimethyl sulfate to obtain an optically active polymer. Structural analysis showed that the product has two types of structure, the reaction temperature and the amount of initiator on the relative content of these two structural components have an impact. The ring-opening polymerization mechanism was discussed.