Thermal decomposition of vinyl- and allylsilane platinum(II) complexes and platinum(II)catalysed synthesis of (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.