US5185474A
Expired / Lapsed
US
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Synthesis of fluorinated dimethyl ethers
Assignee: Hampshire Chemical Corp
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Filing: 1992-04-27
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Granted: 1993-02-09
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Expires: 2012-04-27
Abstract
Abstract A novel process is disclosed for the synthesis of fluorinated dimethyl ethers of the formula CF 2 HOCCl X F Y H 3- (X+Y) wherein X and Y are each independently 0, 1, 2 or 3 and wherein the total X+Y is 2 or 3. The process involves chlorination of methyl difluoromethyl ether to form a chlorinated reaction product, including at least one compound of the formula CF 2 HOCH 3-z Cl z , wherein z is 1, 2 or 3, which compound is then fluorinated, with or without separation from the chlorinated reaction product, to give a fluorinated reaction product including the aforementioned fluorinated dimethyl ethers.
Inventors
- 👤 Gerald J. O'Neill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:01
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/12; C07C43/123; C07C41/00; C07C41/01; C07C41/16; C07C41/18; C07C41/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A process for the preparation of fluorinated dimethyl ethers of the formula CF 2 HOCCl x F y H 3- (x+y), wherein x is 0, 1, or 2 and y is 1, 2, or 3 and wherein the total x+y is 1, 2 or 3, said process consisting essentially of: chlorinating CF 2 HOCH 3 in a liquid phase by reacting said CF 2 HOCH 3 with chlorine gas n the presence of light to form a chlorinated admixture containing at least one compound of the formula CF 2 HOCH 3-z Cl z wherein z is 1, 2 or 3; and flourinating said at least one compound of the formula CF 2 HOCH 3-z Cl z with anhydrous HF in the absence of a catalyst to obtain a fluorinated admixture containing at least one compound of a formula CF 2 HOCl y F z H 3- (y+z) wherein y is 0, 1 or 2 and z is 1, 2 or 3.
Claim 2
Dependent Claim
161 words
A process for the preparation of fluorinated dimethyl ethers of the formula CF 2 HOCCl x F y H 3- (x+y), wherein x is 0, 1, or 2 and y is 1, 2, or 3 and wherein the total x+y is 1, 2 or 3, said process consisting essentially of: chlorinating CF 2 HOCH 3 in a liquid phase by reacting said CF 2 HOCH 3 with chlorine gas n the presence of light to form a chlorinated admixture containing at least one compound of the formula CF 2 HOCH 3-z Cl z wherein z is 1, 2 or 3; and flourinating said at least one compound of the formula CF 2 HOCH 3-z Cl z with anhydrous HF in the absence of a catalyst to obtain a fluorinated admixture containing at least one compound of a formula CF 2 HOCl y F z H 3- (y+z) wherein y is 0, 1 or 2 and z is 1, 2 or 3.
Claim 3
Dependent Claim
40 words
A process in accordance with claim 1 wherein said one compound of the formula CF 2 HOH 3-z Cl 2 and said fluorinated admixture includes CF 2 HOCF 2 H, CF 2 HOCFCl 2 and CF 2 HOCF 2 Cl.
Claim 4
Dependent Claim
61 words
A process in accordance with claim 1 wherein said one compound of the formula CF 2 HOCH 3-z Cl 2 is CHF 2 OCHCl 2 and said one compound of the formula CF 2 HOCCl x F y H 3- (x+y) is CHF 2 OCHF 2 and further comprising separating and recovering said CHF 2 OCHF 2 from said fluorinated admixture.
Claim 5
Dependent Claim
61 words
A method in accordance with claim 1 wherein said one compound of the formula CF 2 HOCH 3-z Cl 2 is CF 2 HOCCl 3 and said one compound of the formula CF 2 HOCCl x F y H 3- (x+y) is CF 2 HOCF 2 Cl and further comprising separating and recovering said CF 2 HOCF 2 Cl from solution.
Claim 6
Dependent Claim
29 words
A method in accordance with claim 1 additionally comprising reacting CHF 2 Cl with an alkali metal methoxide in solvent solution to form said CHF 2 OCH 3 .
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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) | 1996-02-09 | 1996-08-10 | 1997-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-02-09 | 2000-08-10 | 2001-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-02-09 | 2004-08-10 | 2005-02-09 | $7700.00 | Window Closed / Lapsed |