A general synthesis of 4-benzophosphonia-pyrans, a new series of phosphorus and oxygen heterocycles is described. The phosphonium nature of the cations is demonstrated. Their physical properties (UV, 31P-NMR) are compared with those of previously-studied 4-phosphonia-pyrans, as a function of substituents. An exaltation of the phenomena in the present series is pointed out.
描述了4-
苯并膦-
吡喃的一般合成,一系列新的
磷和
氧杂环。证明了阳离子的nature性质。根据取代基的功能,将它们的物理性质(UV,31 P-NMR)与先前研究的4-膦-
吡喃比较。指出了本系列中的现象的一种提升。