CO substitution in PhCCo3(CO)(9) by 4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (bpcd). Ligand fluxionality, kinetics, and X-ray structures of PhCCo3(CO)(7)(bpcd) and Co-3(CO)(6)[mu(2)-eta(2),eta(1)-C(Ph)C=C(PPh2)C(O)CH2C(O)]-(mu(2)-PPh2) - Simon Bott (Structural Chemistry, 2001)