Shielding effect of carbonyl group and its application to the conformational analysis of 1,1,10,10-tetramethyl[3.3]metacyclophane-2,11-dione
作者:Yoshimasa Fukazawa、Yanyan Yang、Tatsuhiko Hayashibara、Shuji Usui
DOI:10.1016/0040-4020(96)00006-3
日期:1996.2
The conformational analysis of the title compound (2) using X-ray crystallographic analysis, molecular mechanics calculations, and chemical shift simulation method is presented. Temperature dependent signal behavior of 2 in its 1H NMR spectrum showed that a single anti conformer plays a significant role in its conformational dynamic equilibrium with very small contribution of syn structures. The structure
介绍了使用X射线晶体分析,分子力学计算和化学位移模拟方法对标题化合物(2)进行的构象分析。2在其1 H NMR光谱中与温度相关的信号行为表明,单个反构象异构体在其构象动态平衡中起着重要作用,而同构结构的贡献很小。通过我们新开发的技术使用化学位移模拟分析了抗构象异构体的结构。因此,在溶液中明确地确定了抗构象异构体的结构,并且与在结晶状态下发现的结构相同。