作者:Kaoru Tsuboyama、Sei Tsuboyama、Masaya Yanagita
DOI:10.1246/bcsj.40.2954
日期:1967.12
Poly-(R)-2-ethylaziridine (I) was obtained by three different procedures: (A) the polymerization of (R)-2-ethylaziridine (II) by boron trifluoride-etherate, (B) the polymerization of the aziridine in the presence of ammonium chloride in liquid ammonia, and (C) the reaction of (R)-2-amino-l-bromobutane hydrobromide (III) with caustic alkali. The stereoregularity of the polymer I may be assumed to be fairly high as a result of comparing the specific rotations of the above polymers. In order to evaluate this assumption, the addition reaction of the aziridine and diethylamine was carried out as a model experiment under experimental conditions similar to those of the polymerization (A). On the basis of the data as analyzed by gas chromatography, it is concluded that the ring opening at the primary carbon takes place over 99.4%. This implies that the ring cleavage at the primary carbon in the polymerization occurs over 180 units successively. Considering the molecular weight of the polymer I (3500–5000, 50–70 monomer units), one can assume that the configuration of the polymers obtained here perfectly retains that of the monomer and that the polymer is “isotactic.”
聚-(R)-2-乙基腈 (I) 通过三种不同的程序获得:(A) 在氟化硼乙醚的作用下聚合 (R)-2-乙基腈 (II),(B) 在氨液中存在氯化铵的情况下聚合腈,(C) 将(R)-2-氨基-1-溴丁烷溴化氢 (III) 与强碱反应。比较上述聚合物的比旋光度,可以假设聚合物 I 的立构规则性相当高。为了评估这一假设,进行了腈与二乙胺的加成反应作为模型实验,实验条件与聚合 (A) 相似。根据气相色谱分析的数据,得出初级碳的开环反应发生率超过99.4%。这意味着在聚合过程中,初级碳的环断裂连续发生超过180个单元。考虑到聚合物 I 的分子量 (3500–5000,50–70个单体单位),可以假设此处获得的聚合物的构型完美保留了单体的构型,因此该聚合物为“各向同性”。