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US4447660A
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Process for the isomerization of ortho-and para-bromophenols or the ethers thereof into meta-bromophenols and corresponding ethers
Assignee: Produits Chimiques Ugine Kuhlmann
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Filing: 1982-09-30
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Granted: 1984-05-08
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Expires: 2002-09-30
Abstract
Abstract Process for the isomerization of ortho- and para-bromophenols or the ethers thereof into corresponding meta-brominated derivatives by isomerizing ortho- and para-bromophenols in the corresponding ethers in the presence of a liquid superacid at a temperature in the region of ambient temperature.
Inventors
- 👤 Marie-Paule Jouannetaud
- 👤 Jean-Pierre Gesson
- 👤 Jean-Claude Jacquessy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:38
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/32; C07C37/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
A process for the isomerization of ortho- and para-bromo phenols or the ethers thereof into corresponding meta-brominated derivatives, comprising isomerizing the ortho- or para-brominated phenols or ethers in the presence of a liquid superacidic medium having a H 0 acidity estimated on the Hammett logarithmic scale of greater than -11 up to about 31 25 at elevated temperatures to effect isomerization of the ortho- and para-bromophenols or the corresponding ethers to the meta-brominated derivatives.
Claim 2
Dependent Claim
74 words
A process for the isomerization of ortho- and para-bromo phenols or the ethers thereof into corresponding meta-brominated derivatives, comprising isomerizing the ortho- or para-brominated phenols or ethers in the presence of a liquid superacidic medium having a H 0 acidity estimated on the Hammett logarithmic scale of greater than -11 up to about 31 25 at elevated temperatures to effect isomerization of the ortho- and para-bromophenols or the corresponding ethers to the meta-brominated derivatives.
Claim 3
Dependent Claim
13 words
The process according to claim 1 in which the temperature is ambient temperature.
Claim 4
Dependent Claim
20 words
The process according to claims 1 or 2 in which the liquid superacidic medium is fluoroantimonic acid HF--SbF 5 .
Claim 5
Dependent Claim
24 words
The process according to claims 1 or 2 in which the liquid superacidic medium is a complex of hydrofluoric acid and boron trifluoride HF--BF3.
Claim 6
Dependent Claim
20 words
The process according to claim 1 in which the liquid superacidic medium is magic acid FSO 3 H--SbF 5 .
Claim 7
Dependent Claim
21 words
The process according to claim 1 in which the liquid superacidic medium is a complex of trifluoromethanesulfonic acid and antimony pentafluoride.
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) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |