Double‐Coupling of Dibromo Arenes with Aryltriolborates for Synthesis of Diaryl‐Substituted Planar Frameworks.

Abstract A new method for simple and practical synthesis of diaryl-substituted arenes using potassium aryltriolborates was developed. Double-cross-coupling of dibromo arenes with aryltriolborates was carried out in the presence of a palladium catalyst, such as Pd(OAc) 2 , Pd(PPh 3 ) 4 or Pd(OAc) 2 /BIPHEP. The use of CuCl (40 mol %) with a palladium catalyst was found to be highly effective to give diaryl-substituted aromatic compounds in good yields.