Cyclopentadienyl-Ruthenium and-Osmium Chemistry. XXII Synthesis, X-Ray Structure and Some Reactions of RuCl(PPh₃)(η¹-Ph₂PCH₂PPh₂)(η-C5H₅), Containing a Monodentate CH₂(PPh₂)₂Ligand

Stoichiometric amounts of RuCl(PPh₃)₂(η-C₅H₅) and dppm react in refluxing C₆H₆ to give RuCl-(PPh3)(η¹-dppm)(η-C₅H₅), which has been fully characterized by an X-ray study (triclinic, space group P 1, a 22 377(6), b 9 913(2), c 9 826(3)Å, α 70 46(2), β 78 72(2), γ 80 40(2)°, Z 2) in which 3299 data [I > 3σ(I)] were refined to R 0 046, R’ 0 052. Structural parameters are similar to those of other RuX(PR₃)₂(η-C₅H₅) complexes. The chloro complex was converted into [Ru(PPh₃)(η²-dppm)(η-C₅H₅)]⁺ salts; the other PPh₃ ligand can be replaced by a second dppm ligand to give [Ru(dppm)2(η-C₅H₅)]⁺, which contains both mono- and bidentate dppm ligands. Alkylation of the uncoordinated phosphorus with Mel is accompanied by halogen exchange to give [RuI(PPh₃)-(PPh₂CH₂PMePh₂)(η-C₅H₅)] I, while reactions with a variety of transition metal complexes result in abstraction of PPh₃and formation of RuCl(dppm)(η-C₅H₅).