Addition of anhydrous hydrogen chloride to bis(ethynyl)bis(dimethylphenyl-phosphine)platinum(II). A novel sequence of platinum(II) promoted addition–elimination reactions

Abstract

trans-[Pt(CCH)₂L₂](I) reacts with anhydrous HCl (1 equiv.) to give trans-[PtCl(CCH)L₂](V) and acetylene by way of a sequence of reactions involving trans-[Pt(CCH)(CClCH₂)L₂](II), trans-[Pt(CClCH₂)₂L₂](III), and trans-[PtCl(CClCH₂)L₂](IV), where L = PMe₂Ph; the reaction sequence demonstrates that platinum(II) promotes both the rapid addition of HCl to a co-ordinated acetylide ligand and the ready eliminatior of HCl from the α-chlorovinyl ligand, Pt-CClCH₂.