Silver-Mediated Oxidative C–H/P–H Functionalization: An Efficient Route for the Synthesis of Benzo[b]phosphole Oxides

A Ag-mediated C–H/P–H functionalization reaction of arylphosphine oxides with internal alkynes was described for the direct preparation of benzo­[b]­phosphole oxides with a high yield. An unusual aryl migration on the P-atom derived from a C–P bond cleavage and a new C–P bond formation was also observed and demonstrated to proceed via the radical process.