Triptycene derivatives that carry C4-olefinic substituents at the 9-position, in which the olefin is connected to C(9) through an sp2 carbon, are synthesized. Their dynamic behaviors, as observed by dynamic NMR technique, are discussed on the basis of the results of MM2 calculations. The barrier to rotation of the olefinic groups is higher when there is a methyl group which directs inside relative to the triptycene skeleton, than the cases where no such a methyl group exists.
本研究合成了在 9 位带有 C4
烯烃取代基的三茂
蒽衍
生物,其中
烯烃通过一个 sp2
碳与 C(9)相连。在
MM2 计算结果的
基础上,讨论了通过动态核磁共振技术观察到的它们的动态行为。与不存在
甲基基团的情况相比,当存在
甲基基团时,
烯烃基团相对于三庚
烯骨架内部的旋转障碍更高。