US4219681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of 2-(perfluoroalkyl)-ethanols
Assignee: Hoechst AG
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Filing: 1979-08-06
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Granted: 1980-08-26
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Expires: 1999-08-06
Abstract
Abstract 2-(perfluoroalkyl)-ethanols of the formula RfCH2CH2OH in which Rf is a perfluoroalkyl radical having from 1 to 21 carbon atoms, are prepared in an advantageous manner from the corresponding 2-(perfluoroalkyl)-ethyl iodides by reaction with water and N-methyl-2-pyrrolidone, thus reducing formation of by-products.
Inventors
- 👤 Ulrich Schwenk
- 👤 Inge Konig
- 👤 Horst Streitberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:50
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/09; C07C29/12; C07C29/124
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
57 words
A process for the manufacture of 2-(perfluoroalkyl)ethanols of the formula R.sub.f CH.sub.2 CH.sub.2 OH wherein R f is a linear or terminally methyl-branched perfluoroalkyl having from 1 to 21 carbon atoms from the corresponding 2-(perfluoroalkyl)-ethyl iodides, which comprises reacting these iodides with water and N-methyl-2-pyrrolidone at a temperature in the range of from 100° to 200° C.
Claim 2
Dependent Claim
57 words
A process for the manufacture of 2-(perfluoroalkyl)ethanols of the formula R.sub.f CH.sub.2 CH.sub.2 OH wherein R f is a linear or terminally methyl-branched perfluoroalkyl having from 1 to 21 carbon atoms from the corresponding 2-(perfluoroalkyl)-ethyl iodides, which comprises reacting these iodides with water and N-methyl-2-pyrrolidone at a temperature in the range of from 100° to 200° C.
Claim 3
Dependent Claim
20 words
The process as claimed in claim 1, wherein the molar ratio of water to 2-(perfluoroalkyl)-ethyl iodide is at least 1:1.
Claim 4
Dependent Claim
21 words
The process as claimed in claim 1, wherein the molar ratio of water to 2-(perfluoroalkyl)-ethyl iodide is from 1:1 to 10:1.
Claim 5
Dependent Claim
20 words
The process as claimed in claim 1, wherein the molar ratio of N-methyl-2-pyrrolidone to 2-(perfluoroalkyl)-ethyl iodide is at least 1:1.
Claim 6
Dependent Claim
21 words
The process as claimed in claim 1, wherein the molar ratio of N-methyl-2-pyrrolidone to 2-(perfluoroalkyl)-ethyl iodide is from 2:1 to 50:1.
References Cited (Backward Citations)
US4001309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |