作者:F.G. Riddell、M.H. Berry、E.S. Turner
DOI:10.1016/0040-4020(78)88341-0
日期:1978.1
A conformational study of some tetrahydro-1,4,2-dioxazines by use of 1H and 13C NMR spectroscopy is reported. The conformational characteristics of this ring are compared to those of the related systems, tetrahydro-1,2- and 1,3-oxazine. A study of model compounds allows the assignment of ring and nitrogen inversion processes in the variable temperature NMR spectra. Ring inversion is found to be a lower
报道了通过1 H和13 C NMR光谱对一些四氢-1,4,2-二恶嗪的构象研究。将该环的构象特征与相关体系的构象特征进行比较,四氢-1,2-和1,3-恶嗪。对模型化合物的研究允许在可变温度NMR光谱中分配环和氮的转化过程。发现环转化比氮转化具有更低的能量过程。这些过程的障碍是通过几种衍生物测量的,并指出了该结果对其他6-元环中氮转化研究的影响。测量和讨论了N-Me和N-Et基团的构象自由能差。将N-Et组轴向放置比N-Me(约.0.25 kcal摩尔-1)。它似乎比在C-6处的Et基团比在Me处更容易轴向发生。