A Rational Design for the Directed Helicity Change of Polyacetylene Using Dynamic Rotaxane Mobility by Means of Through-Space Chirality Transfer
作者:Fumitaka Ishiwari、Kei-ichiro Fukasawa、Takashi Sato、Kazuko Nakazono、Yasuhito Koyama、Toshikazu Takata
DOI:10.1002/chem.201101727
日期:2011.10.17
main chain for the formation of a one‐handed helix. Through‐space chirality induction in the present systems proved to be as powerful as through‐bond chirality induction for formation of a one‐handed helix, as demonstrated in an experiment using non‐rotaxane‐based polyacetylene that had an optically active binaphthyl group. The present protocol for controlling the helical structure of polyacetylene therefore
通过与置于侧链上的轮烷骨架杂交,实现了对聚乙炔动态螺旋的直接螺旋控制。通过由光学活性冠醚和仲铵盐与乙炔基苯甲酸组成的假轮烷的酯封端,以高收率合成了轮烷拴系的苯乙炔单体。单体与[RhCl(nbd)} 2 ](nbd =降冰片二烯)聚合,以高收率得到相应的聚乙炔。具有远离主链的光学活性轮组分的聚合物没有棉花效应,因此表明外消旋螺旋的形成。我们的建议是仲胺的N-酰基中和通过观察主链吸收区周围的棉花效应,当车轮组分接近主链时,侧链轮烷部分的铵部分可实现单手螺旋的不对称诱导。尽管侧链轮烷部分具有铵结构,但带有侧链轮烷的聚乙炔具有较短的车轴成分,但仍显示出棉花效应,这表明轮与主链之间的亲近对于形成单链轮非常重要。螺旋。如在使用具有旋光性双萘基的非基于轮烷的聚乙炔的实验中所证明的,在本系统中,通过空间手性诱导与通过手性手性诱导形成单螺旋结构一样强大。