Preparation of organosiloxanes

US4060537A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunther Maass · Bensberg, DE
• Hans Joachim Lucking · Leverkusen, DE
• Werner Buchner · Leverkusen, DE
• Bruno Degen · Much, DE

Key dates

• Filing date: Dec 3, 1976
• Grant date: Nov 29, 1977
• Expiry date: Dec 3, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F7/0874
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In the preparation of cyclic and linear organosiloxanes by reacting an organohalogenosilane with a compound of the formula EQU ROR' in which PA1 R is an alkyl radical with 1-4 C atoms, and PA1 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.sub.2, FeCl.sub.3, CdCl.sub.2 or H.sub.2 SO.sub.4. Advantageously ROR' is methanol, ethanol, propanol, dimethyl ether or diethyl ether.