Shape-Persistent and Shape-Adaptable
Macrocycles Based on Restricted Rotation: Studies Building
Toward ‘Macromolecular Playdough’
作者:Ken Shimizu、Yong Chong
DOI:10.1055/s-2002-32539
日期:——
A rigid 48-membered macrocycle 1 was synthesized and studied that comprises two atropisomeric N,N′-diarylnaphthalenediimide building blocks that adopt stable syn and anti conformations due to restricted rotation about two Caryl-Nimide bonds. The resulting macrocycle maintains three distinct conformations: anti/anti, syn/anti and syn/syn conformers that are stable and separable at room temperatures, and each with distinct shapes and sizes as measured by GPC. At elevated temperatures, macrocycle 1 was conformationally flexible and showed interconversion of the respective isomers. Conformational preferences established at higher temperatures were preserved on cooling to room temperature as the restricted rotation was reestablished and the macrocycle becomes conformationally rigid.
合成并研究了刚性的 48 元大环 1,它包含两个阻转异构体 N,N'-二芳基萘二亚胺结构单元,由于两个芳基-酰亚胺键的旋转受到限制,它们采用稳定的顺式和反式构象。 所得大环保持三种不同的构象:反/反、顺/反和顺/顺构象,它们在室温下稳定且可分离,并且通过GPC测量,每种构象都具有不同的形状和尺寸。在高温下,大环 1 具有构象柔性,并显示出各个异构体的相互转化。在冷却至室温时,随着限制旋转的重新建立并且大环变得构象刚性,在较高温度下建立的构象偏好得以保留。