Synthesis and chiroptical properties of helical poly(phenylacetylene) bearing optically active chiral oxazoline Pendants
作者:Poompat Rattanatraicharoen、Keiko Shintaku、Kazuhiro Yamabuki、Tsutomu Oishi、Kenjiro Onimura
DOI:10.1016/j.polymer.2012.04.026
日期:2012.6
active (S)-4-benzyl-2-(ethynylphenyl)-oxazoline (BnEPhOx) was successfully prepared and polymerized using rhodium catalyst ([Rh(nbd)Cl]2) to obtain the moderate molecular weight poly(phenylacetylene)s bearing chiral oxazoline derivatives with high yields (≥90%). The 1H NMR spectra demonstrated that the resulting polymers had high stereoregular structures. Moreover, the poly(phenylacetylene)s bearing
成功地制备了新型旋光性(S)-4-苄基-2-(乙炔基苯基)-恶唑啉(BnEPhOx),并使用铑催化剂([Rh(nbd)Cl] 2)进行了聚合,得到了中等分子量的聚苯乙炔具有高收率(≥90%)的手性恶唑啉衍生物。在11 H NMR光谱表明,所得聚合物具有高的立体规则结构。此外,带有手性恶唑啉的聚(苯乙炔)比聚(苯乙炔)表现出更好的热稳定性。所得聚合物显示出比单体更高的旋光度绝对值。聚合物在氯仿溶液中的共轭聚乙炔骨架的π-π*带区域也显示出强烈的CD信号。比旋光度和CD光谱的结果表明,所有聚合物均采用高阶结构,主要是单手的螺丝感。此外,所得聚合物在紫外线照射下发出荧光。