Restricted Rotation Involving the Tetrahedral Carbon. LXIII. Endeavor toward Enhancing the Rotational Barrier in 9-<b><i>s</i></b>-Alkyltriptycenes
作者:Michinori Oki、Taizo Fukuda、Mitsuhiro Asakura、Shinji Toyota
DOI:10.1246/bcsj.69.3267
日期:1996.11
In order to enhance barriers to rotation about the C9-substituent bond in 9-s-alkyltritpycenes, the secondary alkyl group was modified as well as the peri-substituent. The barrier was slightly enhanced by modifying the substituents but the extent was rather limited. This limitation was attributed to the limitation of the ways of preparation of 9-s-alkyltriptycenes that should give three stable rotamers