Thiadiazatrimethylenemethane and N,N′,P-triphenylphosphonothioic diamide complexes of platinum(II)

Abstract

Reaction of N,N′-diphenylthiourea with cis-[PtCl₂L₂][L = PPh₃, PMePh₂, PMe₂Ph, PEt₂Ph, PPh₂(NEt₂) or L₂= Ph₂PCH₂CH₂PPh₂(dppe)] in the presence of silver(I) oxide gives the thiadiazatrimethylenemethane complexes [[graphic omitted]Ph}L₂], an X-ray study on [[graphic omitted]Ph}(PPh₃)₂] establishing the presence of a flat [graphic omitted] ring. Related [graphic omitted] ring complexes which contain a reactive nucleophilic PNPh group are formed upon treatment of PhNHP (S)(Ph) NHPh with cis-[PtCl₂L₂][L = PPh₃, L₂= dppe, Ph₂P(CH₂)₃PPh₂ or Ph₂P(CH₂)₄PPh₂] and potassium hydroxide. Treatment of [[graphic omitted]Ph}L₂] with MeI afforded an aminophosphonium salt, whilst with substrates containing either CO or CS functionalities new complexes of the type [[graphic omitted]Ph}L₂] or [[graphic omitted]}L₂] were formed respectively.