TWO CONSECUTIVE GEAR MOTIONS IN CONFORMATIONAL INTERCONVERSION IN 9-(2-METHYLBENZYL)TRIPTYCENE DERIVATIVES
作者:Gaku Yamamoto、Michinori Oki
DOI:10.1246/cl.1979.1255
日期:1979.10.5
The conformationalinterconversion among ±sc and ap forms of 9-(2-methylbenzyl)triptycenes is found to occur by two consecutive gear motions: methyl-inside conformers formed by the synchronous rotation about the CH2–Ar and CH2–C9 bonds of the methyl-outside conformers are so unstable that another synchronous rotation takes place in succession to afford methyl-outside conformers. The change in 1H-nmr