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US4247713A
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Alkyl perfluoro-ω-fluoroformyl esters and their preparation
Assignee: EIDP Inc
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Filing: 1978-08-17
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Granted: 1981-01-27
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Expires: 1998-08-17
Abstract
Abstract Alkyl perfluoro-ω-fluoroformyl esters are provided which have the formula: ##STR1## wherein R is alkyl of 1-6 carbon atoms, and n is 0-6 (preferably 0). compounds where n is 0 are prepared by contacting SO 3 with a compound of the formula ROOC--CF 2 --CF 2 --OR 1 . Compounds where n is 1-6 are prepared by contacting a compound where n is 0 with hexafluoropropylene oxide.
Inventors
- 👤 David C. England
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:13
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/22; C08G65/223; C08G65/226; C08G65/26; C08G65/2639
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
15 words
A compound of the formula ROOCCF.sub.2 COF wherein R is alkyl of 1-6 carbon atoms.
Claim 2
Dependent Claim
15 words
A compound of the formula ROOCCF.sub.2 COF wherein R is alkyl of 1-6 carbon atoms.
Claim 3
Dependent Claim
9 words
The compound of claim 1 wherein R is methyl.
Claim 4
Dependent Claim
9 words
The compound of claim 1 wherein R is ethyl.
Claim 5
Dependent Claim
60 words
A process of preparing ROOC--CF 2 --COF comprising: contacting SO 3 with a compound of the formula ROOC--CF 2 --CF 2 --OR 1 wherein R and R 1 , alike or different, are alkyl of 1-6 carbon atoms at a temperature of -30° C. to 250° C. in molecular proportions from 1:20 to 20:1 while dissipating the heat of reaction.
Claim 6
Dependent Claim
60 words
A process of preparing ROOC--CF 2 --COF comprising: contacting SO 3 with a compound of the formula ROOC--CF 2 --CF 2 --OR 1 wherein R and R 1 , alike or different, are alkyl of 1-6 carbon atoms at a temperature of -30° C. to 250° C. in molecular proportions from 1:20 to 20:1 while dissipating the heat of reaction.
Claim 7
Dependent Claim
9 words
The process of claim 4 wherein R is methyl.
Claim 8
Dependent Claim
9 words
The process of claim 4 wherein R is ethyl.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |