Acyclic Catena-Diphosphinodiphosphonium Dications [R3p-Pr-Pr-Pr3]2+ or Bisphosphine-Diphosphenium Complexes [R3PfPR-PRrPR3]2+: Synthesis by Reductive P-P Coupling of [R3p-PRCl]+ and Phosphine Ligand Exchange

doi 10.1021/ja062972y.s004