Unusual chemical reactivity in the reactions of Re2(CO)8(μ-H)(μ-η1,η2-CHCHBu) with 2,3-bis(diphenylphosphino)maleic anhydride (bma) and Re2(CO)8(bma) with Ni(cod)2: X-ray diffraction structures of Re2(CO)8(bma), zwitterionic Re(CO)4[Re(CO)4(bma)], and the phosphido-bridged complex Re2(CO)8[μ-η1,η1-(O)](μ-PPh2) - Simon Bott (Journal of Organometallic Chemistry, 2004)