Stereospecific Replacement of the Boranato Group of Phosphine–Boranes by Oxygen or Sulfur. Synthesis of Optically Active, P -Chiral Phosphine Oxides, Phosphine Sulfides, Phosphinates, and Phosphinothioates

Optically active, P-chiral phosphine–boranes were oxidized by m-chloroperbenzoic acid to give phosphine oxides or phosphinates with almost complete retention of configuration. The oxidation of the same phosphine–boranes with iodine in the presence of