- Building blocks for oligomeric siloxanes –selective chlorination of hydrido-siloxanes
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A new method was developed to achieve highly selective monochlorination of α,ω-dihydridosiloxanes, ((H)Me2SiO-(SiMe2O)n-SiMe2(H), n = 0–2; (H)R2Si–O-SiR2(H); R = Me, iPr, Ph; 3,5-dihydridooctamethyltetrasiloxane, Me3SiO-(Si(H)MeO)2–SiMe3) with trichloroisocyanuric acid (TCCA). The dependence of the selectivity of the monochlorination on the siloxane chain length is also discussed.
- Hafner, Thomas,Torvisco, Ana,Uhlig, Frank
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supporting information
p. 1 - 4
(2018/09/11)
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- POLYARYLACETYLENES CONTAINING SILOXANE, SILANE, AND CARBORANE MOIETIES
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Disclosed herein are the compounds shown below. Each R is an organic group, Cb is a carborane group, and —C6H4— is phenylene. The value of each m is a nonnegative integer, q is 0 or 1, with the proviso that if q is 0 then m is 0 or 1, p is a positive integer, r is a positive integer, and n is an integer greater than or equal to 10. Also disclosed are methods of making and crosslinking the compounds. [in-line-formulae]—{SiR2—([O]q—SiR2)m-[Cb-SiR2—([O]q—SiR2)m]p—C≡C—C6H4—C≡C}—[/in-line-formulae] [in-line-formulae]—{SiR2—(O—SiR2)m—C≡C—C6H4—C≡C}n—;[/in-line-formulae] [in-line-formulae]—{SiR2—([O]q—SiR2)m—[C≡C—C6H4—C≡C—SiR2—([O]q—SiR2)m]p-Cb-[SiR2—([O]q—SiR2)m-Cb]r}-[/in-line-formulae]
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- REACTION OF OCTAMETHYLCYCLOTETRASILOXANE AND PERMETHYLOLIGOSILOXANES WITH ACYL CHLORIDES IN THE PRESENCE OF CoCl2
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Octamethylcyclotetrasiloxane is cleaved quantitatively by acetyl chloride (1:1 molar ratio) in the presence of anhydrous CoCl2 in acetonitrile at room temperature to form primarily α-chloro-ω-acetoxyoligodimethylsiloxanes nOCOCH3 (n = 0-3; yield, 60-65percent)>.In the presence of an equimolar amount of trimethylacetoxysilane of hexamethyldisiloxane, the major reaction products are α-methyl-ω-acetoxyoligodimethylsiloxanes nOCOCH3 (n = 4-6; yield, 65-70percent)>.
- Basenko, S. V.,Ogorodnikova, E. I.,Vitkovskii, V. Yu.,Mirskov, R. G.,Voronkov, M. G.
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- A Convenient Synthesis of α,ω-Difunctionalized Linear Dimethylsiloxanes with Definite Chain Lengths
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α,ω-Difunctionalized linear dimethylsiloxanes with definite chain lengths are conveniently prepared by the inorganic-solid-catalyzed ring cleavage of cyclodimethylsiloxanes with dimethylchlorosilane and water under very mild conditions.
- Yoshino, Koji,Kawamata, Akira,Uchida, Hiroaki,Kabe, Yoshio
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p. 2133 - 2136
(2007/10/02)
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