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 CF3C
CCF3 are reported.