Optically active polyacrylamides bearing an oxazoline pendant: Influence of stereoregularity on both chiroptical properties and chiral recognition
作者:Wei Lu、Liping Lou、Fangyu Hu、LiMing Jiang、Zhiquan Shen
DOI:10.1002/pola.24346
日期:2010.12.1
radically polymerized in the presence of rare earth metal trifluoromethanesulfonates (Ln(OTf)3, Ln = La, Nd, Sm, and Y) to yield corresponding optically active polymers. Among these Lewis acids, Y(OTf)3 was found to be most effective for increasing the isotactic specificity during the radical polymerizations when using n‐butanol as solvent. Also, the effect of the Lewis acids was significantly influenced
对映体纯丙烯酰胺衍生物,N- [邻-(4-甲基-4,5-二氢-1,3-恶唑-2-基)苯基]丙烯酰胺(MeOPAM),N- [邻-(4-异丙基-4,5 -二氢-1,3-恶唑-2-基)苯基]丙烯酰胺(Pr i OPAM)和N- [邻-(4-苯基-4,5-二氢-1,3-恶唑-2-基)苯基合成丙烯酰胺(PhOPAM),并在稀土金属三氟甲磺酸盐(Ln(OTf)3,Ln = La,Nd,Sm和Y)存在下进行自由基聚合,得到相应的旋光聚合物。在这些路易斯酸中,发现使用Y(OTf)3对于提高自由基聚合过程中的全同立构专一性最为有效。正丁醇为溶剂。而且,路易斯酸的作用受到Ln(OTf)3与单体的比率的显着影响。然后,通过诸如NMR,荧光和圆二色性的光谱技术,对具有各种立构规整度的所得聚合物检查了手性和手性与立体规则性之间的关系。结果表明,等规度较高的聚合物表现出良好的对1,1'-bi-2-萘酚的对映选择性,如1所示。1