Synthesis of the chiral tetrahedral clusters RCCo2NiCp(CO)4(bmf) (R=H, Ph) and thermally promoted diphosphine ligand activation: Regiospecific P–C bond scission and X-ray diffraction structure of Co2NiCp(CO)4[μ2,η2,η1-C(H)CC(PPh2)C(O)OCH(OMe)](μ-PPh2) - Simon Bott (Journal of Organometallic Chemistry, 2006)