Aryl-Aryl Coupling Reaction Using a Novel and Highly Active Palladium Reagent Prepared from Pd(OAc)2, 1,3-Bis[diphenylphosphino]propane (DPPP), and Bu3P.

A palladium-assisted coupling reaction of aryl triflate with arene was investigated, and a novel Pd reagent prepared from equimolar Pd(OAc)2, 1,3-Bis[diphenylphosphino]propane (DPPP), and Bu3P was developed. This method is useful for intramolecular biaryl coupling reactions, not only between aryl triflate and arene (triflate-amide), but also between aryl halide and arene (halo-amide).