Preparation and Characterization of Trimethylsilylpyridylacetylene Bridged,Dicobalt Carbonyl Complexes Containing Bis(diphenylphosphino)methylene or Bis(diphenylphosphino)ethylene Ligand

Reaction of an alkyne‐bridged dicobalt complex, [Co₂(CO)₆(μ‐Me₃SiC=Cpy)] 4 , with bis(diphenylphosphino)methylene (DPPM) or bis(diphenylphosphino)ethylene (DPPE) in THF at 55 °C yielded a DPPM or DPPE doubly bridged dicobalt compound, [{μ‐P,P‐PPh₂CH₂PPh₂}Co₂(CO)₄(μ‐Me₃SiC=Cpy)] 5 or [{μ‐P,P‐PPh₂CH₂CH₂PPh₂}Co₂(CO)₄(μ‐Me₃SiC≡Cpy)] 6 . Compound 5 and 6 were characterized by spectroscopic means as well as X‐ray crystal structure determination.