Some reactions of phosphine complexes of platinum(0) and palladium(0) with acidic solvents; a phosphorus-31 nuclear magnetic resonance study

Abstract

The complexes [Pt(PPh₃)₄] and [Pt(PPh₃)₃] react quantitatively with anhydrous hydrogen chloride and bromide to give cis-dihalogenobis(triphenylphosphine)platinum(II) complexes and hydrogen. [Pd(PPh₃)₄] In liquid hydrogen chloride reacts to give trans-dichlorobis(triphenylphosphine)palladium(II) and hydrogen but the reaction proceeds with further replacement of triphenylphosphine at the metal, since trans-[PdCl₂(PPh₃)₂] itself reacts in liquid hydrogen chloride to give triphenylphosphonium tetrachlorodi-µ-chloro-dipalladate(II), [Ph₃PH]₂[Pd₂Cl₆]. [NiCl₂(PPh₃)₂] Reacts with liquid hydrogen chloride to give NiCl₂ and Ph₃PH + HCl₂^–. The reactions of [Pt-(PPh₃)₄] with sulphuric and trifluoroacetic acids have also been studied.