Asymmetric polymerization of triphenylmethyl methacrylate leading to a one-handed helical polymer: mechanism of polymerization
作者:Tamaki Nakano、Yoshio Okamoto、Koichi Hatada
DOI:10.1021/ja00030a030
日期:1992.2
Asymmetric oligomerization of triphenylmethyl methacrylate (TrMA) was carried out with complexes of 9-fluorenyllithium and chiral ligands in toluene at -78 o C, and the oligomers obtained were converted into methyl esters. The resulting oligo(methyl methacrylate)s were first fractionated by gel permeation chromatography in terms of degree of polymerization and further separated into diastereomers and
甲基丙烯酸三苯甲酯 (TrMA) 与 9-芴基锂和手性配体在甲苯中的配合物在 -78 o C 下进行不对称低聚反应,并将所得低聚物转化为甲酯。所得低聚(甲基丙烯酸甲酯)首先通过凝胶渗透色谱法根据聚合度进行分馏,然后通过高效液相色谱法进一步分离为非对映异构体和旋光异构体。低聚物的分布和每个低聚物中异构体的比例提供了关于 TrMA 不对称(螺旋有义选择性)聚合机制的重要信息