Nucleophilic Attack of Carbonyl-Stabilized Phosphorus Ylides on 1,5-Cyclooctadiene Complexes of Palladium and Platinum

Carbonyl-stabilized phosphorus ylides R 3 P CHC(O)R‘ (R = Ph, Tol- p; R‘ = OEt, OMe, NMe 2 ) react with the 1,5-cyclooctadiene complexes [MCl 2 (cod)] (M = Pt, Pd; cod = C 8 H 12 = 1,5-cyclooctadiene) to give the monomeric cyclooctenyl complexes [MCl 2 {C 8 H 12 {CH(PR 3 )C(O)R‘}}]. The ylides attack in an exo fashion to give complexes which can be regarded as metalated phosphonium salts. Reactions involving the replacement of one or both chloro ligands with a neutral ligand are discussed. The crystal structures of complexes [PtCl 2 {C 8 H 12 {CH(PPh 3 )CO 2 Me}}] and [Pt{C 8 H 12 {CH(PPh 3 )CO 2 Me}}(py) 2 ](CF 3 SO 3 ) 2 are reported.