Direct alkoxysilylation of alkoxysilanes for the synthesis of explicit alkoxysiloxane oligomers

Ryutaro Wakabayashi, Misa Tamai, Kazufumi Kawahara, Hiroki Tachibana, Yutaka Imamura, Hiromi Nakai, Kazuyuki Kuroda

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12 Citations (Scopus)

Abstract

Direct alkoxysilylation, which is a powerful tool to provide explicit alkoxysiloxanes, is developed and its versatility is investigated. Siloxane pentamers Si[OSiR 1(OMe) 2] 4 having various functional groups (R 1 = methyl, vinyl, phenyl, chloropropyl and n-butyl groups) were successfully obtained by direct alkoxysilylation of Si(OR) 4 (R = t-Bu, CHPh 2). Thus, the versatility of the reaction is confirmed on organic functional groups R 1. Functional group tolerance of the reaction is discussed on the basis of electronegativity of the R 1 groups. Alkoxysilylation of Si(Ot-Bu) 2(OMe) 2 and Si(Ot-Bu)(OMe) 3 selectively gives trimer (MeO) 2Si[OSiMe(OMe) 2] 2 and dimer (MeO) 3SiOSiMe(OMe) 2, respectively. Thus, the feasibility on siloxane structure is also confirmed. Various siloxane compounds are synthesized by this newly developed reaction for the first time.

Original languageEnglish
Pages (from-to)26-31
Number of pages6
JournalJournal of Organometallic Chemistry
Volume716
DOIs
Publication statusPublished - 2012 Oct 1

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Keywords

  • Alkoxysilanes
  • Lewis acids
  • Nonhydrolytic synthesis
  • Siloxanes
  • Sol-gel processes

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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