Synthesis and chiroptical properties of helical polyallenes bearing chiral cholesteryl pendant groups
Synthesis and chiroptical properties of helical polyallenes bearing chiral cholesteryl pendant groups
复制标题
带有手性胆固醇侧基的螺旋聚丙二烯的合成和手性光学性质
DOI：
10.1002/pola.28609
复制
发表时间：
2017
影响因子：
--
通讯作者：
Wu Zong-Quan
中科院分区：
文献类型：
--
作者：
Yu Zhi-Peng;Liu Na;Lin Ya-Lan;Huang Jian;Wang Hui-Qing;Wu Zong-Quan
设计并合成了一种带有手性胆甾醇侧基的胆甾醇氧基丙二烯（1）。该单体与烯丙基镍络合物作为催化剂的活性聚合以高产率得到具有可控分子量和窄分子量分布的聚（胆固醇氧基丙二烯）（poly-1 ms）。发现这些聚合物具有动态螺旋构象，具有优选的手性正己烷，如通过圆二色性和吸收光谱以及光学比所证实的。螺旋构象的聚合物被揭示为稳定的重复单元的数目增加，直到聚合度达到100。通过改变溶液的温度可以控制poly-1100的螺旋构象。© 2017 Wiley Periodicals，Inc. J.波利姆科学，A部分：聚合物化学2017，55，2227-2233
A cholesteryloxyallene (1) bearing chiral cholesteryl pendant group was designed and synthesized. Living polymerization of this monomer with an allylnickel complex as a catalyst give poly(cholesteryloxyallene)s (poly‐1ms) in high yields with controllable molecular weights and narrow molecular weight distributions. These polymers were found to possess a dynamic helical conformation with a preferred handedness inn‐hexane as confirmed by circular dichroism and absorption spectra as well as optical ratios. The helical conformation of the polymers was revealed to stabilize as the number of repeat units increased until the degree of polymerization reached 100. The helical conformation of poly‐1100could be controlled by altering the temperature of solutions. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem.2017,55, 2227–2233