Cationic Platinum(II) - or Palladium(II)-carbonyl complexes and unsaturated substrates: a facile way to C-C bond formation

Article abstract of DOI:10.1016/0022-328X(94)05294-L

Alkenes, alkynes, 1,2- and 1,3-dienes react with ⁺ (M = Pt or Pd; R = hydrocarbyl group; N-N = bidentate nitrogen ligand) to give R-substituted derivatives.The organic fragment is generally retained within the metal environment in η¹ or η³ coordination, except in the reaction of alkenes with Pd^(II) complexes.In this case, a free R-substituted alkene is produced via a relatively fast β-elimination process from a Pd-alkyl intermediate.Different regiochemistries are detected in the reaction between monosubstituted olefins (propene or styrene) and homologous Pt and Pd complexes.The Pt-C bond is always formed with the terminal unsubstituted alkene carbon, while a preference toward the internal carbon, particularly if phenyl-substituted, is observed with Pd species.Neutral are markedly less reactive.In this case, when M = Pt, the unsaturated organic substrate generally adds to the metal affording fairly stable tbp five-coordinate complexes. Keywords: Platinum; Palladium; Synthesis; C-C bond formation