作者:J.C. Jochims、J. Lambrecht、U. Burkert✠、L. Zsolnai、G. Huttner
DOI:10.1016/s0040-4020(01)91479-6
日期:1984.1
Barriers to racemization of the o-mono and O'-disubstituted N-phenyl ketenimines la–j were measured by dynamic NMR spectroscopy. The structures of the ketenimines 1k, 1were established by X-ray diffraction analysis. According to the experimental results and ab initio calculations (STO-3G basis set) N-aryl ketenimines and N-aryl imines in general invert their configurations by a coupled mechanism: a
通过动态NMR光谱测量了O-单取代和O'-二取代的N-苯基烯酮亚胺la–j外消旋化的障碍。通过X射线衍射分析确定酮亚胺1k,1的结构。根据实验结果和从头算(STO-3G基集),N-芳基烯酮亚胺和N-芳基亚胺通常通过偶联机理反转其构型:围绕N-芳基键的旋转耦合至氮的反转。在氮气反演的过渡状态下的ARELπ系统缀合至p孤电子对的氮; 然而,在基态下,芳基系统和C = N双键之间的共轭在电子上是优选的,但在空间上可能是受阻的。