The chemistry of co-ordinated ligands. Part IV. Reactivity of cycloocta-1,5-diene and its derivatives co-ordinated to palladium and platinum

Abstract

Nucleophilic addition of [CH(COMe)₂]^–(acac) to the co-ordinated double bond in the cyclo-octenyl complexes (C₈H₁₂acac)Pt(acac) and (C₈H₁₂OMe)Pt(acac) is induced by reaction of the complexes with tertiary phosphines, L. Transfer of the acetylacetone ligand from the metal to the co-ordinated cyclo-octenyl occurs and the complexes (C₈H₁₂acac₂)PtL₂ and [C₈H₁₂(acac)(OMe)]PtL₂ are produced. The detailed course of this reaction is unknown but it is possible that it takes place by an intramolecular rearrangement. With the corresponding palladium complexes the reaction is different. The co-ordinated cyclo-octenyl and O-bonded acetylacetone are replaced by triphenyl-phosphine, -arsine, or -stibine ligands to give the zero-valent complexes Pd(NR₃)₄. From the triphenylphosphine reaction the cyclic diene C₈H₁₁acac has been isolated as the organic product.