Thermal decomposition of vinyl- and allylsilane platinum(II) complexes and platinum(II)catalysed synthesis of (E),(E)-1,4-diphenyl-1,3-butadiene

  • Paul P. Mebe Department of Chemistry, School of Maths and Natural Sciences, University of Venda, Limpopo, South Africa
  • John W. Fitch Department of Chemistry, Southwest Texas State University, San Marcos, Texas 78666, USA
  • Mark Munyai Department of Chemistry, University of Zimbabwe, Zimbabwe. P. O. Box MP167, Harare, Zimbabwe
Keywords: Thermal analysis, Vinyl- and allylsilane platinum(II) π-complexes, Platinum(II) catalysed synthesis, (E), (E)-1, 4-diphenyl-1, 3-butadiene

Abstract

Thermal stabilities of Pt(II) complexes: K[PtCl3(CH2=CHSiMe3)], K[PtCl3(CH2=CHCH2SiMe3)], K[(acac)PtCl(CH2=CHSiMe3)] and [PtCl(CH2=CHCH2SiMe3)]2, were examined. All complexes were found to be stable at room temperature but they decomposed without melting above about 90 oC. The allylsilane complex decomposed above about 125 oC. All complexes liberated chlorotrimethylsilane on decomposition, showing the facile cleavage of the C-Si bond by nucleophilic attack on the silicon by the chloride ion. (E),(E)-1,4-diphenyl-1,3-butadiene was stereoselectively synthesised in good yield from (E)-β-styrylsilane in the presence of Zeise’s salt.

 

KEY WORDS: Thermal analysis, Vinyl- and allylsilane platinum(II) π-complexes, Platinum(II) catalysed synthesis, (E),(E)-1,4-diphenyl-1,3-butadiene

 

 

Bull. Chem. Soc. Ethiop. 2008, 22(3), 445-448.

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