Dynamic stereochemistry of imines and derivatives. Part 16. Conformation and stereodynamics of oxaziridines, nitrones, and imines containing the N-(1-mesitylethyl) or (1-pentamethylphenylethyl) group; a nuclear magnetic resonance and X-ray crystallographic investigation
作者:Derek R. Boyd、Kenneth M. McCombe、Thomas A. Hamor、W. Brian Jennings、Valerie E. Wilson
DOI:10.1039/p29840000095
日期:——
barriers(8–17 kcal mol–1)were evaluated by lineshape analysis and compared with that in 1-mesitylethylamine. The conformation of 3,3-diphenyl-2-(1-mesitylethyl)oxaziridine (1), which shows abnormal ortho-methyl signal positions and a high rotational barrier, has been determined in the solid state by X-ray crystallography.
在环境温度或低于环境温度下观察到的八个标题化合物中的邻甲基的1 H nmr化学位移非等价性被指定为绕芳基-CHMe键缓慢旋转。通过线形分析评估了旋转势垒(8–17 kcal mol –1),并将其与1-甲基间乙胺进行了比较。已经通过X射线晶体学测定了处于固态的3,3-二苯基-2-(1-间甲苯基乙基)恶二丙啶(1)的构型,该构型显示出异常的邻甲基信号位置和高的旋转势垒。