Facile syntheses of the metallacyclic rings Pt–C–P–C, Pt–N–P–N and Pt–N–S–N; crystal structures of [Pt{CH(COPh)P(O)(Ph)CH(COPh)}(PPh3)2] and [Pt{C(CO2Me)C(CO2Me)NHS(O)2NH}(PMePh2)2]

Abstract

Reaction of PhCOCH₂P(O)(Ph)CH₂COPh, RNHP(O)(Ph)NHR or RNHS(O)₂NHR (R = H or Ph) with cis-[PtCl₂L₂](L = PPh₃ or PMePh₂; L₂= Ph₂PCH₂CH₂PPh₂ or cycloocta-1,5-diene) in the presence of silver(I) oxide gives metallacyclic complexes of the type [[graphic omitted]H(COPh)}L₂], [[graphic omitted]R} L₂] or [[graphic omitted]R}L₂] respectively; single crystal X-ray studies on [[graphic omitted]H(COPh)}(PPh₃)₂] and the insertion product [[graphic omitted]H}(PMePh₂)₂] establish the presence of puckered metallacycles, the oxygen of the platinaphosphetane-3-oxide adopting an equatorial environment.