The Trityl?Cation Mediated Phosphine Oxides Reduction

Reduction of phosphine oxides into the corresponding phosphines using PhSiH3 as a reducing agent and Ph3C+[B(C6F5)4]? an initiator is described. The process highly efficient, broad range secondary tertiary alkyl arylphosphines, bearing various functional groups in generally good yields. reaction believed to proceed through generation silyl cation, which with oxide provides phosphonium salt, further reduced by silane afford desired along siloxanes.