Restricted Rotation Involving the Tetrahedral Carbon. XXXIX. 9-(2-Methoxy-1-methylethyl)triptycene Derivatives
作者:Masahiko Suzuki、Gaku Yamamoto、Hiromi Kikuchi、Michinori Oki
DOI:10.1246/bcsj.54.2383
日期:1981.8
benzynes to examine the feasibility of isolating rotational isomers of 9-isopropyltriptycene derivatives at room temperature. They afforded crystalline ap forms which underwent internal rotation with activation energies of ca. 23 kcal/mol. 9-(2-Acetoxy-1-methylethyl)-1,2,3,4-tetrachlorotriptycene gave similar results. Based on the results, the barrier to rotation of 9-isopropyl-1,2,3,4-tetrabromotriptycene
从 9-(2-甲氧基-1-甲基乙基) 蒽和相应的苄制备 9-(2-甲氧基-1-甲基乙基)triptycenes 以检查在室温下分离 9-isopropyltriptycene 衍生物的旋转异构体的可行性。他们提供了结晶 ap 形式,该形式经历了内部旋转,活化能约为。23 大卡/摩尔。9-(2-乙酰氧基-1-甲基乙基)-1,2,3,4-四氯三苯产生类似的结果。根据结果,重新检查了 9-异丙基-1,2,3,4-四溴三苯环烯的旋转障碍,表明它必须在 175 °C 下校正为 23.5 kcal/mol。