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The reaction of (Ph 3 P) 2 PtC 2 H 4  with the divinyldisiloxane (CH 2 =CHSiMe 2 ) 2 O in toluene yields Pt{(η 2 -H 2 C=CHSiMe 2 ) 2 O}PPh 3 , which has been characterized by IR,  1 H,  13 C,  31 P 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, β = 103.73(1)°, 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 η/ 2 -ligand to give a chair conformation of the six-membered PtC 2 Si 2 O-ring system.

Tetramethyld-η 2 -vinyldisiloxan(triphenylphosphan)platin(0) / Tetramethyldi-η 2 -vinyldisiloxane(triphenylphosphine)platinum(0)