The reactions of 2,2'-bipyridine N.N'-dioxides with POCl3 and SO2Cl2 have been investigated, and the products shown to be synthetically useful halogenated derivatives. The presence of substituents in the 4 position favours an intramolecular cyclisation to form dipyrido[1,2-b:2,3-d]-isoxazolinium salts, which have been characterised for the first time.
已经研究了2,2'-联
吡啶N.N'-二氧化物与POCl 3和SO 2 Cl 2的反应,并且该产物显示出是合成上有用的卤代衍
生物。在4位的取代基的存在有利于分子内环化以形成二
吡啶并[1,2-b:2,3-d]-
异恶唑啉鎓盐,这是首次被表征。