Process for the preparation of alkyl and aryl substituted oligosiloxanes suitable for use as diffusion pump oils
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United States of America Patent
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Jan 5, 1982
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N/A
app pub date -
Feb 12, 1981
filing date -
Feb 12, 1981
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Abstract
An improved process for preparing 1,3-dialkyl-1,1,3,3-tetraryldisiloxanes and 1,3,5-trialkyl-1,1,3,5,5-pentaaryltrisiloxanes is disclosed. The process utilizes an aryl Grignard reagent to affect displacement of alkoxy, preferably methoxy, groups in the corresponding alkyl-alkoxy substituted di-, and trisiloxanes. Alternatively, partial replacement of the alkoxy groups in an alkyltrialkoxysilane with aryl groups in a Grignard reaction, and subsequent hydrolyis of the remaining alkoxy groups yield the above-noted desired compounds.
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