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.