The oxidative addition of allylic halides to bis(cyclo-octa-1,5-diene)-platinum; dynamic behaviour of σ- and 1–3-η-allyl(cyclo-octa-1,5-diene) platinum complexes

Abstract

Addition of [Pt(cod)₂](cod = cyclo-octa-1,5-diene) to an excess of an allylic halide affords crystalline compounds [Ptx(σ-allyl)(cod)](X = Cl or Br; allyl = C₃H₅, 2-MeC₃H₄, 3-MeC₃H₄, or 3-PhC₃H₄). Halide-anion abstraction with silver tetrafluoroborate yields the cationic complexes [Pt(η³-allyl)(cod)][BF₄]. The variable-temperature ¹H and ¹³C n.m.r. spectra are reported, and discussed in terms of a dynamic process involving reversible co-ordination of a donor solvent molecule.