Abstract
The linear 1,4-bis(diphenylphosphanyl)octaphenyl-n-tetrasilane was prepared starting from chlorodiphenylphosphane and 1,4-dilithiooctaphenyl-n-tetrasilane, Li(SiPh2)4Li. The latter one was made from cyclo-(SiPh2)5 and lithium. The title compound was obtained in moderate yield and characterized by IR, Raman, UV, 31P, 29Si, and 1H NMR spectroscopy. The crystal structure analysis of the title compound shows a perfect anti conformation (180°) for the central Si-Si-Si-Si unit. The silicon-silicon and the silicon-phosphorus bonds are elongated. This is caused by the complete substitution of the molecule by sterically demanding phenyl-substituents and effective σ-conjugation along the main chain.
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