the formation of resonance signals in the phosphorane region but these phosphoranes are usually unstable. However both enantiomers of the 2-phenyl-1,3,2-oxazaphospholidine give chiral bicyclic spirophosphoranes which have been characterized by 31P and 1H NMR and high resolution mass speetroscopies.
已经研究了2-羟基-5-硝基-苄基卤化物与三种手性五或六元氧杂
磷杂环烷基的反应。在每种情况下,31 P NMR分析均表明在
磷烷区域中形成了共振信号,但这些
磷烷通常不稳定。然而,2-苯基-1,3,2-氧杂氮
磷吡啶的两种对映体均具有手性双环螺正膦,其特征在于31 P和1 H NMR和高分辨率质谱。