Russian Chemical Bulletin

, Volume 44, Issue 7, pp 1286–1292 | Cite as

Problems of synthesis of tetrahedral organosilsesquioxanes. Hydrolytic condensation of hexafunctional branched organotetrasiloxanes

  • E. A. Rebrov
  • N. A. Tebeneva
  • A. M. Mouzafarov
  • Yu. E. Ovchinnikov
  • Yu. T. Struchkov
  • T. V. Strelkova
Organic Chemistry

Abstract

The hydrolytic condensation of methyltris(methyldichlorosiloxy)silane (1b), methyl(1a), and vinyltris(methyldiethoxysiloxy)silanes (1c) in dilute homogeneous solutions was studied. It was found by X-ray diffraction and1H NMR methods that, irrespective of reaction conditions, only octaorganooctasilsesquioxanes (T8), namely, octamethyloctasilsesquioxane and 1,4-divinylhexamethyloctasilsesquioxane, were obtained instead of the expected tetraorganotetrasilsesquioxanes (T4). These data suggest that the condensation processes involved in the hydrolysis of1a–c are predominantly intermolecular, and the molecules of the starting oligomers do not undergo rearrangements. Probably, the formation ofT4, whose molecules are built of four strained six-membered organosiloxane cycles, is less favorable thermodynamically than the formation of their homologs (T8) built of eightmembered organosiloxane cycles.

Key words

polyorganosilsesquioxane polyhedra hydrolytic condensation of functional organosiloxanes X-ray diffraction study hydrosilylation 

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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • E. A. Rebrov
    • 1
  • N. A. Tebeneva
    • 1
  • A. M. Mouzafarov
    • 1
  • Yu. E. Ovchinnikov
    • 2
  • Yu. T. Struchkov
    • 2
  • T. V. Strelkova
    • 2
  1. 1.Institute of Synthetic Polymeric MaterialsRussian Academy of SciencesMoscowRussian Federation
  2. 2.A. N. Nesmeyanov Institute of Organoelement CompoundsRussian Academy of SciencesMoscowRussian Federation

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