Nucleophilic attack of carbonyl-stabilized phosphorus ylides on 1,5-cyclooctadiene complexes of palladium and platinum

Carbonyl-stabilized phosphorus ylides R3P=CHC(O)R' (R = Ph, Tol-p; R' = OEt , OMe NMe2) react with the 1,5-cyclooctadiene complexes [MCl2(cod)] (M = Pt , Pd; cod = C8H12 = 1,5-cyclooctadiene) to give the monomeric cyclooctenyl complexes [MCl2{C8H12{CH(PR3)C(O)R'}}]. The ylides attack in an exo fashion to give complexes which can be regarded as metalated phosphonium salts. Re actions involving the replacement of one or both chloro ligands with a neut ral ligand are discussed. The crystal structures of complexes [PtCl2{C8H12{ CH(PPh3)CO2Me}}] and [Pt{C8H12{CH(PPh3)CO2Me}}(py)(2)](CF2SO3)(2) are repor ted.