Cluster chemistry. LXXXIII. Reactions of Ru5(μ5-C2PPh2)(μ-PPh2)(CO)13 with olefins: Products formed by addition of an alkene to the C2 fragment. X-ray structures of Ru5(μ4-PPh)4-C2(CHCHR)CHCH2R>(μ-PPh2)(CO)12 (R = H, Me) and Ru5(μ4-PPh)(μ-PPh2)(μ-CO)(CO)105-C5H3...

Article abstract of DOI:10.1016/0022-328X(93)80206-Q

Addition of two molecules of ethene to the C2PPh2 unit of Ru5(μ₅-C2PPh2)(μ-PPh2)(CO)13 (1) produced two isomers of Ru5(μ₄-PPh)<μ₄-C2(CHCH2)CHMe>(μ-PPh2)(CO)12 (4a, 4b).The metal core consists of a wing-tip-bridged butterfly, one Ru4 face of which is capped by a carbon atom of a hydrocarbon ligand formed by addition of two molecules of ethene to one carbon of a C2 unit derived from the C2PPh2 ligand.The other Ru4 face is capped by a μ₄-PPh group.The isomers differ in the relative locations of the μ-PPh2 and CO groups.Reactions with propene and but-1-ene yielded the analogous complexes Ru5(μ₄-PPh)<μ₄-C2(CHCHR)CHCH2R>(μ-PPh2)(CO)12 .Reaction of 4a with further ethene produced Ru5(μ₄- PPh)(μ-PPh2)(μ-CO)(CO)10<η⁵-C5H3Me-1-(CH=CH2)-3> (8), in which a square pyramidal Ru5 core is capped on the square face by a μ₄-PPh ligand.One basal edge is bridged by the μ-PPh2 group and one of the other basal Ru atoms carriers the disubstituted cyclopentadienyl ligand, which has been formed by combination of the third ethene molecule with the μ₄-C2(CHCH2)CHMe ligand of 4.Complexes 4a, 5b and 8 were characterised by single-crystal X-ray studies.