Reactions of Ru3(μ-dppm) (CO)10 with unsaturated hydrocarbons Cycloocta-1,3,5,7-tetraene X-ray structures of Ru3(μ-dppm)(μ-C8H8)(CO)6

Article abstract of DOI:10.1016/S0022-328X(96)06519-9

Reactions between Ru₃(μ-dppm)(CO)₁₀ and cycloocta-1,3,5,7-tetraene (cot) in refluxing thf afford the four complexes Ru₃(μ-dppm)(μ-C₈H₈XCO)₆ (2), Ru₃(μ₃-PPhCH₂PPh₂)(μ₃-C₈H₈)(Ph)(CO)₅ (3), Ru₃{μ₃-PPhCH₂PPh(C₆H₄)}(μ-C₈H₈)(μ-CO)(CO)₄ (4) and Ru₃(μ-H){μ₃-PPh₂CHPPh(C₆H₄)}(μ-C₈H₉)(μ-CO)(CO)₄ (5) which have been structurally characterised by means of X-ray crystallography. Complex 3 is the first example of an Ru₃ cluster containing a cot ligand capping the Ru3 face. In 2 and 4, the cot ligand is found bridging an Ru-Ru edge; in 2, only one Ru of this edge is bonded to a P atom. In 3, a P-C bond of the dppm ligand has oxidatively added to one Ru atom to give an unusual example of a cluster-bonded σ-phenyl group. Complex 5 contains a C₈H₉ ligand and dppm unusually dimetallated at the methylene carbon and at a phenyl group.