Diphosphine derivatives of urea and thiourea

Abstract

The reaction of (Me₃Si)HNC(O)NH(SiMe₃) or thiourea with PPh₂Cl gave Ph₂PHNC(E)NHPPh₂(E = O I or S II) which may be oxidised at the phosphorus(III) centres to give Ph₂P(E′)HNC(E)NHP(E′)Ph₂(E = O, E′= O III, S IV or Se V; E = S, E′= S VI). Compound I forms simple chelate P,P′ complexes with platinum and palladium. The crystal structures of II·Me₂SO IV and cis-[PdCl₂{Ph₂PNHCONHPPh₂-P,P′}] have been determined.