Patent US4423260A successfully refreshed from Google Patents.
US4423260A
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Method for introducing fluorine into an aromatic ring
Assignee: United States Department of the Air Force
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Filing: 1982-01-27
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Granted: 1983-12-27
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Expires: 2002-01-27
Abstract
Abstract A process for introducing a fluorine atom into an aromatic hydrocarbon by effecting a substitution reaction between an aromatic hydrocarbon and an NF 4 + cation containing salt.
Inventors
- 👤 Karl O. Christe
- 👤 Carl J. Schack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:42
CPC Classifications
C; C07; C07B; C07B39/00; C07C; C07C17/00; C07C17/093; C07C17/10; C07C17/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
52 words
A process for introducing a fluorine atom into the ring structure of an aromatic compound which comprises the step of effecting a substitution reaction between (1) an aromatic compound selected from the group consisting of benzene, toluene and nitrobenzene and (2) a hydrogen fluoride solvent solution of NF 4 BF 4 .
Claim 2
Dependent Claim
52 words
A process for introducing a fluorine atom into the ring structure of an aromatic compound which comprises the step of effecting a substitution reaction between (1) an aromatic compound selected from the group consisting of benzene, toluene and nitrobenzene and (2) a hydrogen fluoride solvent solution of NF 4 BF 4 .
Claim 3
Dependent Claim
13 words
A process in accordance with claim 1 wherein said aromatic compound is benzene.
Claim 4
Dependent Claim
13 words
A process in accordance with claim 1 wherein said aromatic compound is toluene.
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) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |