Reaction Kinetics and Catalysis Letters

, Volume 16, Issue 1, pp 19–27 | Cite as

Condensation of triphenylsilanol in water-acetonitrile media

  • J. J. Tondeur
  • G. Vandendunghen
  • A. Borghese
  • R. Charlez


Condensation of triphenylsilanol in the presence of tetrabutylammonium hydroxide as catalyst has been studied in water-acetonitrile media with the aim of elucidating the role of water. Negative second order in water was measured, and initial first order in silanol and base was no more observed as the reaction proceeded. These results are best explained by assuming a rapid equilibrium between triphenylsilanol and the base before the rate-determining step, in which a silanolate anion reacts with a triphenylsilanol molecule.


Physical Chemistry Hydroxide Catalysis Silanol Tetrabutylammonium 
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Конденсация трифенилсиланола в присутствии гидрксида тетрабутиламмония как катализатора была исследована в среде вода-ацетонитрил с целью выявления роли воды. Для воды был найден отрицательный кинетический второй порядок, и с ходом реакции начальный первый порядок по силанолу и основанию нарушается. Эти результаты объясняются на основе быстро устанавливающегося равновесия между трифенилсиланолом и основанием, предшествующего ступени, лимитирующей скорость, на которой анион силанолата реагирует с молекулой трифенилсиланола.


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Copyright information

© Akadémiai Kiadó 1981

Authors and Affiliations

  • J. J. Tondeur
    • 1
  • G. Vandendunghen
    • 1
  • A. Borghese
    • 1
  • R. Charlez
    • 1
  1. 1.University of MonsMonsBelgium

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