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.