Formation of platinum(II) compounds containing isomeric σ-vinylic and σ-allylic six-membered chelate rings by deprotonation of the co-ordinated isopropenyl group: X-ray structure of the σ-vinylic complex di-µ-acetato-bis[o-isopropenylphenyl(diphenyl)arsineplatinum(II)]

Abstract

The o-isopropenylphenyl(diphenyl)arsine (ipa) compounds PtCl₂(ipa) and [Pt(acac)(ipa)][BF₄](Hacac = acetylacetone) react with metal acetates to give, respectively, [[graphic omitted]t(O₂CMe)]₂(I), shown from X-ray analysis to have the deprotonated olefin bonded to the platinum atom as a σ-vinyl group, and [graphic omitted]t(acac)(II) in which the ligand is bonded as a σ-allylic group.