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US4060537A Expired / Lapsed US ⏱️ 0.0 years remaining

Preparation of organosiloxanes

Assignee: Bayer AG
•
Filing: 1976-12-03
•
Granted: 1977-11-29
•
Expires: 1996-12-03
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Abstract

Abstract In the preparation of cyclic and linear organosiloxanes by reacting an organohalogenosilane with a compound of the formula ROR' in which R is an alkyl radical with 1-4 C atoms, and R' is hydrogen or an alkyl radical with 1-4 C atoms, The improvement which comprises effecting the reaction in an aqueous solution of a Lewis acid. Preferably the organohalogenosilane is a di- or tri-organo-chloro or -bromo-silane wherein the organo radical is selected from the group consisting of alkyl or alkenyl of up to 4 C atoms or aryl, especially dimethyldichlorosilane, and the Lewis acid is a 40-90% solution of ZnCl 2 , FeCl 3 , CdCl 2 or H 2 SO 4 . Advantageously ROR' is methanol, ethanol, propanol, dimethyl ether or diethyl ether.

Inventors

  • 👤 Gunther Maass
  • 👤 Hans Joachim Lucking
  • 👤 Werner Buchner
  • 👤 Bruno Degen

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 23:53
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/21; C07F7/08; C07F7/0834; C07F7/0838; C07F7/0872; C07F7/0874

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 57 words
In the preparation of cyclic and linear organosiloxanes by reacting an organohalogenosilane with a compound of the formula ROR' in which R is an alkyl radical with 1-4 C atoms, and R' is hydrogen or an alkyl radical with 1-4 C atoms, the improvement which comprises effecting the reaction in an aqueous solution of a Lewis acid.
Claim 2
Dependent Claim 57 words
In the preparation of cyclic and linear organosiloxanes by reacting an organohalogenosilane with a compound of the formula ROR' in which R is an alkyl radical with 1-4 C atoms, and R' is hydrogen or an alkyl radical with 1-4 C atoms, the improvement which comprises effecting the reaction in an aqueous solution of a Lewis acid.
Claim 3
Dependent Claim 52 words
The process according to claim 1, wherein the organohalogenosilane is a di- or tri-organo-chloro- or bromosilane wherein the organo radical is selected from the group consisting of alkyl or alkenyl of up to 4 C atoms or aryl and the Lewis acid is employed in a concentration of about 40 to 90%.
Claim 4
Dependent Claim 68 words
The process according to claim 2, wherein the organo radical is selected from the group consisting of methyl, ethyl, vinyl and phenyl, the halogeno radical is chloro, ROR' is selected from the group consisting of methanol, ethanol, propanol, dimethyl ether and diethyl ether, and the Lewis acid is selected from the group consisting of ZnCl 2 , FeCl 3 , CdCl 2 and H 2 SO 4 .
Claim 5
Dependent Claim 15 words
The process according to claim 1, wherein ZnCl 2 is employed as the Lewis acid.
Claim 6
Dependent Claim 19 words
The process according to claim 1, wherein dimethyldichlorosilane is employed as the organohalogenosilane and methanol is employed as ROR'.
Claim 7
Dependent Claim 35 words
The process according to claim 3, wherein the Lewis acid is ZnCl 2 , the organohalogenosilane is dimethyldichlorosilane, ROR' is methanol, and the reaction is effected at a temperature of about 130° to 180° C.

References Cited (Backward Citations)

US3546265A Cited
US3803195A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-11-28 1981-05-30 1981-11-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-11-28 1985-05-30 1985-11-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-11-28 1989-05-30 1989-11-29 $7700.00 Window Closed / Lapsed

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