From Sergeants and Soldiers to Chiral Conflict Effects in Helical Polymers by Acting on the Conformational Composition of the Comonomers
作者:Katherine Cobos、Rafael Rodríguez、Emilio Quiñoá、Ricardo Riguera、Félix Freire
DOI:10.1002/anie.202009215
日期:2020.12.21
switched within a copolymer by acting on the conformational composition of the components and their chirality. Thus, a sergeant and soldiers effect is produced in two diastereomeric copolymer series, poly[(S)‐1r‐co‐(S)‐2(1−r)] and poly[(R)‐1r‐co‐(S)‐2(1−r)], owing to the presence in chloroform of a preferred conformation in (S)‐2, and a conformational equilibrium in 1, where a P helix is induced independently
通过作用于组分的构象组成及其手性,可以在共聚物内切换不同的通讯机制。因此,在两个非对映异构共聚物系列中,产生了中士和士兵效应,即poly [(S)-1 r- co-(S)-2 (1-r) ]和poly [(R)-1 r- co-( S)-2 (1-r) ],因为在(S)-2中存在氯仿中优选的构象,而在1中存在构象平衡,其中P螺旋线的产生与士兵的绝对配置无关。在THF中,两个组分的侧基之间存在构象平衡,通过两种单体的共聚产生相互的手性增强作用,而在DMF中,由于存在单个构象体,产生了第三种手性至手性的通信转换在两个组成部分的侧链上。在这种情况下,取决于两个组分是引起相同还是相反的螺旋感,就会产生手性冲突或手性一致效应。