OBSERVATION OF RESTRICTED ROTATION ABOUT C–O BONDS BY NMR SPECTROSCOPY IN 9-(2-ALKYLPHENOXY)TRIPTYCENES, A GEAR ROTATION SYSTEM
作者:Gaku Yamamoto、Michinori Oki
DOI:10.1246/cl.1984.97
日期:1984.1.5
4-dimethyltriptycenes revealed that, when the o-alkyl group is methyl or isopropyl, two conformers, ap and ±sc, are separately observed at room temperature and that the interconversion between them occurs by gear rotation with an energy barrier of ca. 18 kcal mol−1
9-(2-烷基苯氧基)-1,4-二甲基三萜烯的动态核磁共振研究表明,当邻烷基为甲基或异丙基时,在室温下分别观察到两个构象异构体 ap 和 ±sc,并且它们通过具有约能量势垒的齿轮旋转发生。18 kcal mol−1