Conformational Analysis of trans-2,11-Dithia-4e,5,6,7e,8,9-hexahydro[3.3]paracyclophane Using VT-NMR
作者:Ya-Chen Yang、Chen-Huei Lin、Lee-Huei Lin、Shaw-Tao Lin
DOI:10.1002/jccs.201100514
日期:2012.3
The conformation of trans‐2,11‐dithia‐4e,5,6,7e,8,9‐hexahydro[3.3]paracyclophanes (5, tDTHHPCP) was investigated by using 1H NMR analysis under variable‐temperature condition. Based on the dynamic 1H NMR behavior along with a structure obtained from simulation using the MM2 method, it has been deduced that 5 occurs preferentially in conformer 5a in CD2Cl2 solution, which the two sulfur atoms are situated
在可变温度条件下,使用1 H NMR分析了反式-2,11-二硫代-4 e,5,6,7 e,8,9-六氢[3.3]对环环烷(5,t DTHHPCP)的构象。根据动态1 H NMR行为以及通过使用MM2方法进行模拟获得的结构,可以推断出5在CD 2 Cl 2溶液中优先出现在构象异构体5a中,两个硫原子分别作为椅子形式存在,并且环己醇单元为扭曲的船形。桥倒置的能垒(ΔG‡)(-CH 2SCH 2-)估计为11.6 kcal mol -1(600 MHz,Tc = -30°C)。根据在‐70°C下获得的光谱为各个氢分配质子化学位移。