Process for the preparation of alkyl and aryl substituted oligosiloxanes suitable for use as diffusion pump oils
US4309557A · kind A · utility
7Cited by
5References
56Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1981 |
| Grant date | Jan 5, 1982 |
| Priority date | — |
| Expiry date | Feb 12, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F7/0878
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.