US4209457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of halogenated benzonitriles
Assignee: ISC Chemicals Ltd
•
Filing: 1979-01-29
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Granted: 1980-06-24
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Expires: 1999-01-29
Abstract
Abstract A process for the production of a fluorobenzonitrile wherein a chlorobenzonitrile having a chlorine atom in an ortho- or para- position with respect to a nitrile group is heated with an alkali metal fluoride at a temperature between 200° and 250° C., in the presence of sulpholane.
Inventors
- 👤 George Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:02
CPC Classifications
C; C07; C07C; C07C255/00; C07C255/49
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
A process for the production of a fluorobenzonitrile comprising heating a chlorobenzonitrile having a chlorine atom in a position selected from the ortho- and para-positions with respect to a nitrile group with potassium fluoride at a temperature between 200° and 250° C. in the presence of sulpholane the molar ratio of sulpholane to chlorobenzonitrile in the reaction mixture being between 1:1 and 6:1 and separating the sulpholane from the reactions products by distillation.
Claim 2
Dependent Claim
73 words
A process for the production of a fluorobenzonitrile comprising heating a chlorobenzonitrile having a chlorine atom in a position selected from the ortho- and para-positions with respect to a nitrile group with potassium fluoride at a temperature between 200° and 250° C. in the presence of sulpholane the molar ratio of sulpholane to chlorobenzonitrile in the reaction mixture being between 1:1 and 6:1 and separating the sulpholane from the reactions products by distillation.
Claim 3
Dependent Claim
16 words
The process according to claim 1, wherein the reaction temperature is between 210° and 240° C.
Claim 4
Dependent Claim
16 words
The process according to claim 1 comprising carrying out the reaction under reflux at atmospheric pressure.
Claim 5
Dependent Claim
16 words
The process according to claim 1, wherein the reaction period is from 6 to 12 hours.
Claim 6
Dependent Claim
15 words
The process according to claim 1, wherein the chlorobenzonitrile contains one chlorine atom per molecule.
Claim 7
Dependent Claim
11 words
The process according to claim 5, wherein the chlorobenzonitrile is 2-chlorobenzonitrile.
Claim 8
Dependent Claim
15 words
The process according to claim 1, wherein the chlorobenzonitrile contains two chlorine atoms per molecule.
Claim 9
Dependent Claim
11 words
The process according to claim 7, wherein the chlorobenzonitrile is 2,6-dichlorobenzonitrile.
References Cited (Backward Citations)
US3290353A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |