−78 °C followed by treatment with aq. HCl gave monocyclic PH phosphoranes 2–4 bearing an apical hydrogen atom in good yields. Particularly in the case of 4, an isomer 4a with intramolccular hydrogen bonding and an isomer 4b with intermolecular hydrogen bonding with a solvent molecule could be separately isolated. Monocyclic phosphoranes 2–4 cyclized intramolecularly with elimination of H2 to form spirophosphoranes
螺
磷硼烷1与3当量的RLi(R = Me,n- Bu,t -Bu)在-78°C下于Et 2 O中反应,然后用
碳酸氢钠水溶液处理。HCl以良好的收率得到了带有顶部氢原子的单环PH
磷烷2-4。特别是在4的情况下,可以单独分离具有分子内氢键的异构体4a和具有与溶剂分子的分子间氢键的异构体4b。单环膦烷2–4在分子内环化并消除H 2形成螺
磷戊烷5–7加热时。环化反应的动力学研究表明它们通过涉及六配位
磷的四元环跃迁态进行。