Reactions of Mes*P=C=O (1; Mes* = 2,4,6-(t-Bu)(3)C6H2) with (PPh(3))(2)Pt(C2H4) (2) and (PCy(3))(2)Pt (3; Cy = cyclo-C6H11) give the diphosphaureylene carbonyl complexes (L)(CO)Pt(Mes*PCOPMes*) (4, L = PPh(3); 5, L = PCy(3)), respectively. The structure of 4 was determined by X-ray crystallography. Addition, of dmpe (dmpe = Me(2)P(CH2)(2)PMe(2)) to 4 or 5 gives (dmpe)Pt-(Mes*PCOPMes*) (6).
Reactions of Mes*P=C=O (1; Mes* = 2,4,6-(t-Bu)(3)C6H2) with (PPh(3))(2)Pt(C2H4) (2) and (PCy(3))(2)Pt (3; Cy = cyclo-C6H11) give the diphosphaureylene carbonyl complexes (L)(CO)Pt(Mes*PCOPMes*) (4, L = PPh(3); 5, L = PCy(3)), respectively. The structure of 4 was determined by X-ray crystallography. Addition, of dmpe (dmpe = Me(2)P(CH2)(2)PMe(2)) to 4 or 5 gives (dmpe)Pt-(Mes*PCOPMes*) (6).