- Direct alkoxysilylation of alkoxysilanes for the synthesis of explicit alkoxysiloxane oligomers
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Direct alkoxysilylation, which is a powerful tool to provide explicit alkoxysiloxanes, is developed and its versatility is investigated. Siloxane pentamers Si[OSiR1(OMe)2]4 having various functional groups (R1 = methyl, vinyl, phenyl, chloropropyl and n-butyl groups) were successfully obtained by direct alkoxysilylation of Si(OR)4 (R = t-Bu, CHPh2). Thus, the versatility of the reaction is confirmed on organic functional groups R1. Functional group tolerance of the reaction is discussed on the basis of electronegativity of the R1 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.
- Wakabayashi, Ryutaro,Tamai, Misa,Kawahara, Kazufumi,Tachibana, Hiroki,Imamura, Yutaka,Nakai, Hiromi,Kuroda, Kazuyuki
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- Convenient synthesis of alkoxyhalosilanes from hydrosilanes
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Selective dehydrogenative coupling of di- and trihydrosilanes with alcohols catalyzed by PdCl2 or NiCl2 afforded alkoxyhydro- and dialkoxyhydrosilanes in good yield. Further treatment of the resulting alkoxyhydrosilanes with carbon tetrachloride or allyl bromide in the presence of the same catalyst led to the formation of alkoxychloro- and alkoxybromosilanes, respectively. Similar reactions of dialkoxyhydrosilanes with carbon tetrachloride afforded dialkoxychlorosilanes in good yield, although contamination of small amounts of trialkoxysilanes and alkoxydichlorosilanes was detected in the products. Selective substitution of the alkoxyhalosilanes with nucleophiles is also reported.
- Ohshita, Joji,Taketsugu, Ryosuke,Nakahara, Yuki,Kunai, Atsutaka
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p. 3258 - 3264
(2007/10/03)
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- Reaction of Tetraalkoxysilanes with Alkyl(aryl)chlorosilanes
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Alkyl(aryl)trichloro- or dialkyl(diaryl)dichlorosilanes react with tetraalkoxysilanes Si(OMe)4, Si(OEt)4, and Si(OBu)4 to give partially etherfied alkyl(aryl)chlorosilanes RSiCl2(OAlk), RSiCl(OAlk)2, and R2SiCl(OAlk).
- Chernyshev, E. A.,Komalenkova, N. G.,Tagachenkov, A. A.,Bykovchenko, V. G.
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p. 241 - 243
(2007/10/03)
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