Rotation of Aryl Groups in 9,10-Diarylphenanthrenes: Does the Rotational Barrier Become Lower as the Backbone Becomes More Crowded?

A series of 9,10-diarylphenanthrenes
was prepared, and their structures
and dynamic behaviors were both theoretically and experimentally investigated.
A more twisted and crowded phenanthrene backbone was associated with
a lower barrier to the rotation of an aryl group.

一系列9,10-二芳基菲结构化合物被合成，其结构及其动态行为从理论和实验两方面进行了深入研究。更为扭曲且拥挤的菲核结构与其上芳基旋转的较低能垒相关。