作者:Noboru koga、Yuzo Kawada、Hiizu Iwamura
DOI:10.1016/s0040-4020(01)87584-0
日期:1986.1
appropriately labeled benzene rings, at least one on each Tp unit. To extend the concept and further demonstrate the high correlation in the torsional motions for these systems, a doubly geared molecule, 9,10-bis(3-chlorotriptycyloxy)triptycene (1), was conceived and constructed. Bis(3-chloro-9-triptycyl) 9,10-triptycenebis(peroxycarboxylate) was prepared. The meso and dl isomers of 1 were separated by HPLC
分别在二(9-三苯甲基)甲烷Tp 2 CH 2和二(9-三苯甲基)醚Tp 2 O中两个CC和C-O键周围的扭转运动对不相关的旋转和耦合扭转的障碍非常低。结果,由于适当标记的苯环之间的不同相关系而产生了新的立体异构体,每个Tp单元上至少有一个。为了扩展该概念并进一步证明这些系统在扭转运动中的高度相关性,构思并构建了双齿轮分子9,10-双(3-氯三蝶氧基)三蝶烯(1)。制备双(3-氯-9-三苯甲基)9,10-三苯并双(过氧羧酸酯)。中观和dl在微型硅胶上通过HPLC分离1的异构体。通过高分辨率的13 C-NMR光谱证实了该结构,所述13 C-NMR光谱揭示了有趣的固醇特征:中间未取代的三萜部分的一个苯环与其他两个非对映异构。在二苯甲烷溶液中测量异构化速率,以给出齿轮打滑过程的活化参数:ΔH ‡ = 42.1±1.3 kcal mol -1和ΔS ‡ = -3.2±2.3 eu讨论了分子链的动力学。