Cyclopentadiene-, furan- and thiophene-derived 1,2-dioxolene complexes of platinum(II) and the crystal structure of [Pt{OCC(CO2Me)CH2C(CO2Me)CO}(PPh3)2]

Abstract

The synthesis of a number of platinum(II)-dioxolene complexes of the type [Pt{O-[graphic omitted]O}L₂] was readily achieved in high yields via the silver(I) oxide-mediated reactions of the cyclic α,β-diketone compounds [graphic omitted]H(CO₂R)(X = CH₂, O or S) with platinum(II) chloride complexes cis-[PtCl₂L₂][L = PPh₃ or L₂= cycloocta-1,5-diene (cod)]. The complexes can be considered to be derived from cyclopentadiene, furan or thiophene, and are related to metal-catecholates. A single-crystal structure determination on the cyclopentadiene-derived complex [Pt{O[graphic omitted]O}(PPh₃)₂] revealed the presence of a planar platinum–oxolene ring system. Silver(I) oxide can also be used to synthesise the related tetrachlorocatechoiato complexes [Pt(1,2-O₂C₆Cl₄)L₂](L = PPh₃ Or L₂= cod) in high yields and purities.