Syntheses of Ru-η6-C6H6-diphosphine complexes and their catalytic properties for hydrogenation of benzene

Six complexes were synthesized and used as catalysts for the hydrogenation of benzene. The study demonstrated that the complexes 1, 2 and 3 were homogeneous and complexes 4, 5 and 6 were simultaneously homogeneous and heterogeneous. The addition of extra phosphine ligand was favorable to stabilize the complex in the catalytic process.