Reaktion des hydridodicobalt-kations [(C5H5Co)2(μ-PMe2)2(μ-H)]+ mit C2(CO2Me)2: Bildung und kristallstruktur eines zweikernkomplexes mit O=C(OMe)CH=C(CO2Me)PMe2 als 6-elektronen-donorligand

[(C₅H₅Co)₂(μ-PMe₂)₂(μ-H)]BF₄ ([II]BF₄) reacts with C₂(CO₂Me)₂ to give the products III and IV. The ionic compound III which formally is a $\text{1}\text{1}$ adduct of [II]BF₄ and C₂(CO₂Me)₂ has been characterized by X-ray structure analysis. III contains the group O=C(OMe)CH=C(CO₂Me)PMe₂ as a 6-electron donor ligand chelated to a cobalt atom and π-bonded to the other cobalt atom. Complex IV is a neutral compound which also can be obtained from [C₅H₅Co(μ-PMe₂)]₂ (I) and C₂(CO₂Me)₂.