The chelating ligand bis[2-(diphenylphosphino)phenyl] ether (DPEphos), in combination with palladium acetate, forms a highly active catalyst system for the coupling of anilines with aryl bromides. The bisphosphine is easily prepared in large quantity and at low cost by a known procedure. The catalyst system is effective in coupling reactions involving a variety of substrates, including electron-poor anilines or electron-rich aryl bromides. In addition, it tolerates a high degree of steric congestion at both the aniline and the aryl bromide. (C) 1998 Elsevier Science Ltd. All rights reserved.
“A highly active palladium catalyst system for the arylation of anilines”, Tet. Lett., 1998, 39(30), 5327-5330.