Preparation of platinum π-olefin complexes from bis(l,5-diphenylpenta-1,4-dien-3-one)platinum(0)

Abstract

Zerovalent platinum olefin and acetylene complexes Pt(OL)L₂ have been isolated for OL = C₂Cl₄, C₂F₄, CF₃CCCF₃, (CF₃)₂CO, and CS₂(but not for non-activated olefins) for a variety of phosphine and arsine ligands L from a reaction with the air-stable derivative bis(1,5 diphenylpenta-1,4-dien-3-one), Pt(dpo)₂. An intermediate complex, Pt(dpo)L₂, involving metal co-ordination to one double bond of the diene ligand, undergoes olefin displacement by OL to give the same derivatives. ¹H and ¹³C N.m.r. spectra for the products Pt(dpo)L₂ and ¹⁹ F n.m.r. spectra for the species Pt(OL)(PEt₃)₂ where OL = C₂F₄ and CF₃CCCF₃ are reported.