Preparation and reactivity of platinathiadiazetidine 1,1-dioxide and platinadiazaphosphetidine 2-oxide complexes

Abstract

Treatment of the complexes cis-[PtCl₂L₂](L = donor ligand) with either N,N′-diphenylsulfamide or N,N′,P-triphenylphosphonic diamide in the presence of an excess of silver(I) oxide in refluxing dichloromethane yielded the new metallacycles [[graphic omitted]Ph}L₂] and [[graphic omitted]Ph}L₂] respectively. The X-ray crystal structure of [[graphic omitted]Ph}(cod)](cod = cycloocta-1,5-diene) showed the presence of an entirely flat four-membered ring, whereas that of [[graphic omitted]Ph}-(PPh₃)₂] exhibits a small puckering angle, but with no substantial Pt ⋯ P transannular interaction. tert-Butyl isocyanide displaces a phosphine ligand from [[graphic omitted]Ph}(PPh₃)₂].