in almost quantitative yields. NMR spectra of these compounds show a remarkable dependence upon temperature associated with a low configurational stability around the carbon-nitrogen double bond. An x-ray crystallographic analysis has been performed, showing an unusually short carbon-nitrogen double bond, which might be expected to be longer to explain the mechanism of the facile thermal isomerization
在N-芳基
碳酰亚胺基二
氯化物的存在下,二芳基1,2-二
酮的选择性阴极还原可产生2-芳基-4,5-二芳基-1,3-二
氧杂
环戊二烯,这是一种鲜为人知的
杂环化合物,几乎可以定量收率。这些化合物的NMR光谱显示出对温度的显着依赖性,以及围绕
碳-
氮双键的低构型稳定性。已经进行了X射线晶体学分析,显示出异常短的
碳-
氮双键,可以预期更长的时间来解释通过失去双键特性的极性过渡态的容易的热异构化的机理。