Patent US4778908A successfully refreshed from Google Patents.
US4778908A
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Process for preparing disilylmethanes
Assignee: EUROPEENNE DE PROPULSION A FRENCH CORP SA Ste
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Filing: 1987-05-29
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Granted: 1988-10-18
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Expires: 2007-05-29
Abstract
Abstract The present invention relates to a process for preparing disilylmethanes, wherein the magnesian reaction is carried out between methylene chloride and at least one chlorosilane in a donor solvent.
Inventors
- 👤 Jean-Paul Pillot
- 👤 Claude Biran
- 👤 Eric Bacque
- 👤 Paulette Lapouyade
- 👤 Jacques Dunogues
- 👤 Pierre Olry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:51
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/121; C07F7/122; C07F7/0801; C07F7/0896
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
44 words
A process for preparing disilylmethanes comprising reacting methylene chloride with at least one chlorosilane, in an electron donor solvent, in the presence of magnesium and zinc, the amount zinc used being from about 5% to about 70% (weight:weight) of the amount of magnesium used.
Claim 2
Dependent Claim
44 words
A process for preparing disilylmethanes comprising reacting methylene chloride with at least one chlorosilane, in an electron donor solvent, in the presence of magnesium and zinc, the amount zinc used being from about 5% to about 70% (weight:weight) of the amount of magnesium used.
Claim 3
Dependent Claim
46 words
The process according to claim 1, characterized in that the chlorosilane has for its formula: ##STR4## in which the radicals R, which may be identical or different, are selected from the group consisting of H, alkyl, cycloalkyl, alkenyl, aryl, arylalkyl, alkylaryl radicals, possibly substituted, and Cl.
Claim 4
Dependent Claim
33 words
The process according to claim 1, characterized in that the chlorosilane is a residue of the direct industrial synthesis of the chlorosilanes with fraction boiling between 130° and 150° C. under atmospheric pressure.
Claim 5
Dependent Claim
30 words
The process according to any one of claims 1 to 3, characterized in that the electron donor solvent is selected from the group consisting of ether, dimethoxyethane, tetrahydrofuran and N-2-methylpyrrolidone.
Claim 6
Dependent Claim
35 words
The process according to claim 4, characterized in that the reaction is carried out at a temperature from about 10° to about 70° C. for a time of from about 8 to about 72 hours.
Claim 7
Dependent Claim
41 words
The process according to any one of claims 1 to 3, characterized in that the reaction is carried out at a temperature of from about 10° to about 70° C. for a duration of from about 8 to about 72 hrs.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |