Reaction of Secondary Phosphine Selenides with Elemental Selenium:Synthesis of Bis(diorganoselenophosphoryl)selenides

摘要

It is known that secondary phosphine oxides are oxidized with oxygen to form phosphinic acids R2P(O)OH [1]. Similarly proceeds the reaction of the secondary phosphine sulfides with elemental sulfur leading to dithiophosphinic acids R2P(S)SH [2]. In the present work we first report on the reaction of the secondary phosphine selenides with elemental selenium. It turned out that the heating (80-85°C, 3 h) of bis(2-arylethyl)phosphine selenides (Ia,Ib) with one equivalent of elemental selenium in toluene does not result in the expected diselenophosphinic acids R2P(Se)SeH. Under these conditions, bis(diorgano-selenophosphoryl)selenides (IIa, IIb) were obtained in 78 and 80% yield, respectively.