TETRAMETHYLDI-ETA-2-VINYLDISILOXANE(TRIPHENYLPHOSPHINE)PLATINUM(0)

The reaction of (Ph3P)2PtC2H4 with the divinyldisiloxane (CH2 = CHSiMe2)2O in toluene yields Pt{(eta(2)-H2C = CHSiMe2)2O}PPh3, which has been characterized by IR, H-1, C-13, P-31 NMR and MS spectra. The crystal structure was determined by X-ray diffraction: space group C2/c, Z = 16, a = 5534.2(9), b = 842.6(2), c = 2383.1(2) pm, beta = 103.73(1)-degrees, R/R(w) = 0.047/0.052. It shows a three-coordinate platinum atom with one phosphine and one sym-tetramethyldivinyldisiloxane ligand acting as a chelating bidentate eta(2)-ligand to give a chair conformation of the six-membered PtC2Si2O-ring system.