Beiträge zur Chemie des Siliciums und Germaniums. XXX [1]. Die photochemische Disproportionierung von iso- und n-Pentasilan. Darstellung einiger neuer verzweigter Hepta- und Octasilane

Contributions to the Chemistry of Silicon and Germanium. XXX. Photochemical Disproportionation of iso- and n-Pentasilane Preparation of Some New Hepta- and Octasilanes Solutions of iso- and n-pentasilane in 2,3-dimethylbutane were irradiated at room temperature by UV-light. The photolytic decomposition of the pentasilanes to higher and lower homologes was controlled by gas chromatography. The main reaction can always be described as disproportionation of the pentasilanes to trisilane and branched heptasilanes, or disilane and branched octasilanes. The new hepta- and octasilanes 3,3-disilylpentasilane and 2,3,3-trisilylpentasilane, obtained from iso-pentasilane, as well as 3-silylhexasilane and 4-silylheptasilane, obtained from n-pentasilane, were isolated and characterised by ¹H-NMR, Raman and mass spectrocsopy.