Synthesis and Characterization of Ruthenium−Osmium Complexes Containing μ-Bisalkenyl, μ-Alkenylvinylidene, and μ-Alkenylcarbene Bridge Ligands

The metaloalkyne complex Ru{( E )-CH CH−(CH 2 ) 4 -C⋮CH}Cl(CO)(P i Pr 3 ) 2 reacts with OsHCl(CO)(P i Pr 3 ) 2 to give the heterodinuclear-μ-bisalkenyl derivative (P i Pr 3 ) 2 (CO)ClRu{( E )-CH CH−(CH 2 ) 4 -CH CH-( E )}OsCl(CO)(P i Pr 3 ) 2 via the hydrido-vinylidene intermediate (P i Pr 3 ) 2 (CO)ClRu{( E )-CH CH−(CH 2 ) 4 -CH C}OsHCl(CO)(P i Pr 3 ) 2 . The reaction of the heterodinuclear-μ-bisalkenyl complex with HCl selectively affords (P i Pr 3 ) 2 (CO)ClRu{( E )-CH CH−(CH 2 ) 5 −CH}OsCl 2 (CO)(P i Pr 3 ) 2 .