某些含氮杂环化合物,其中包括研究得较详的斯德酮类(Sydnones),它们的芳香性格系来自两性离子型的分子结构。已有不少的工作支持这种概括性的意见。例如,Hill和Sutton发现了一些芳基和烷基斯德酮的6.6D左右的偶极矩及其负极指向;deStevens根据红外光谱的测定结果,较前人更为中肯地提出了某些吡唑酮类化合物的两性离子型结构的论点。 Certain nitrogen-containing heterocyclic compounds, including the more well-researched Sydnones, whose aromatic character is derived from zwitterionic molecular structures. Much work has been done to support this general idea. For example, Hill and Sutton found some dipole moments of 6.6D around aryl and alkyl ketones and their negative orientation. According to the results of infrared spectroscopy, deStevens proposed some pyrazoles more moderately than the predecessors The zwitterionic structure of ketones.