US3985810A
Expired / Lapsed
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Process for preparing perfluorinated ethers
Assignee: Hoechst AG
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Filing: 1975-10-28
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Granted: 1976-10-12
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Expires: 1995-10-28
Abstract
Abstract Perfluorinated ethers containing carboxylic acid fluoride groups and optionally units derived from hexafluoropropene epoxide or tetrafluoroethylene epoxide are reacted with fluorine at temperatures of from 50° to 350°C in the presence of metallic catalysts. During the reaction carbonyl difluoride is splitt off and an ether is obtained in high yield which is free of carboxylic acid fluoride groups. Metallic silver is well suited as catalyst.
Inventors
- 👤 Sigmar-Peter von Halasz
- 👤 Friedhelm Kluge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:48
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/12; C07C43/123; C07C43/126; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/321; C08G65/323; C08G65/3233; C08G65/3236; C10; C10M; C10M2211/00; C10M2211/04; C10M2211/042; C10M2211/06; C10M2213/00; C10M2213/04; C10M2213/06; C10N; C10N2040/00; C10N2040/08; C10N2040/14; C10N2040/16; C10N2040/17
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
Process for preparing perfluorinated ethers of the formula ##EQU1## wherein R F represents the radical of a perfluoroalkane having of from 1 to 19 carbon atoms and n free valencies, n is 1 or 2, R represents the groups CF 3 or F and x is an integer of from 0 to 50, which comprises reacting a carboxylic acid fluoride of the formula ##EQU2## wherein R F , R, x and n have the aforesaid meaning, at temperatures of from +50° to +350° C in the presence of a metallic catalyst comprising at least one metal selected from the group consisting of magnesium, tin, lead, bismuth, cerium, lanthanum, titanium, zirconium, chromium and manganese or at least one metal selected from groups IB, IIB or VIII of the Periodic Table, with elementary fluorine.
Claim 2
Dependent Claim
132 words
Process for preparing perfluorinated ethers of the formula ##EQU1## wherein R F represents the radical of a perfluoroalkane having of from 1 to 19 carbon atoms and n free valencies, n is 1 or 2, R represents the groups CF 3 or F and x is an integer of from 0 to 50, which comprises reacting a carboxylic acid fluoride of the formula ##EQU2## wherein R F , R, x and n have the aforesaid meaning, at temperatures of from +50° to +350° C in the presence of a metallic catalyst comprising at least one metal selected from the group consisting of magnesium, tin, lead, bismuth, cerium, lanthanum, titanium, zirconium, chromium and manganese or at least one metal selected from groups IB, IIB or VIII of the Periodic Table, with elementary fluorine.
Claim 3
Dependent Claim
14 words
Process as claimed in claim 1, wherein x is from 5 to 35, inclusive.
Claim 4
Dependent Claim
24 words
Process as claimed in claim 1, wherein R F represents a perfluoroalkyl radical having from 1 to 3 carbon atoms and n is 1.
Claim 5
Dependent Claim
25 words
Process as claimed in claim 1, wherein R F represents a perfluoroalkylene radical having of from 2 to 10 carbon atoms and n is 2.
Claim 6
Dependent Claim
42 words
Process as claimed in claim 4, in which R F is a perfluoroalkylene radical of the formula ##STR24## wherein R' and R'" each represent independent from one another a fluorine atom or a perfluoroalkyl radical having from 1 to 4 carbon atoms.
Claim 7
Dependent Claim
39 words
Process as claimed in claim 4, in which R F represents a perfluoroalkylene radical of the formula --CF 2 --R"--CF 2 --, wherein R" represents a perfluoroalkylene radical having from 1 to 8 carbon atoms or a single bond.
Claim 8
Dependent Claim
17 words
Process as claimed in claim 1, which comprises operating at temperatures of from +80° to +250° C.
Claim 9
Dependent Claim
17 words
Process as claimed in claim 7, which comprises operating at temperatures of from +150° to +210° C.
Claim 10
Dependent Claim
14 words
Process as claimed in claim 1, which comprises using a metallic catalyst containing silver.
Claim 11
Dependent Claim
24 words
Process as claimed in claim 2, wherein R F represents a perfluoroalkyl radical having from 1 to 3 carbon atoms and n is 1.
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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |