US4266064A
Expired / Lapsed
US
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Process for producing chloro β-trifluoromethylpyridines
Assignee: Ishihara Sangyo Kaisha Ltd
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Filing: 1980-03-05
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Granted: 1981-05-05
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Expires: 2000-03-05
Abstract
Abstract A chloro β-trifluoromethylpyridine is produced by reacting a chloro β-trichloromethylpyridine with hydrogen fluoride in the presence of a specific metal fluoride in a vapor phase at high temperature for a short time. The chloro β-trifluoromethylpyridines which are useful as intermediates for agricultural chemicals and medicines can be obtained at high yield.
Inventors
- 👤 Ryuzo Nishiyama
- 👤 Kanichi Fujikawa
- 👤 Isao Yokomichi
- 👤 Yasuhiro Tsujii
- 👤 Shigeyuki Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:21
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/61
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A process for producing a chloroβ-trifluoromethylpyridine selected from the group consisting of 2-chloro-3-trifluoromethylpyridine, 2-chloro-5-trifluoromethylpyridine and 2, 6-dichloro-3-trifluoromethylpyridine which comprises reacting a chloroβ-trichloromethylpyridine selected from the group consisting of 2-chloro-3-trichloromethylpyridine, 2-chloro-5-trichloromethylpyridine and 2, 6-dichloro-3-trichloromethylpyridine with hydrogen fluoride in the presence of a catalyst of a fluoride of at least one metal selected from the group consisting of chromium, iron, nickel, manganese, cobalt and aluminum and diluent in a vapor phase at a temperature of 300° to 500° C. for a residence time of 1 to 60 seconds.
Claim 2
Dependent Claim
86 words
A process for producing a chloroβ-trifluoromethylpyridine selected from the group consisting of 2-chloro-3-trifluoromethylpyridine, 2-chloro-5-trifluoromethylpyridine and 2, 6-dichloro-3-trifluoromethylpyridine which comprises reacting a chloroβ-trichloromethylpyridine selected from the group consisting of 2-chloro-3-trichloromethylpyridine, 2-chloro-5-trichloromethylpyridine and 2, 6-dichloro-3-trichloromethylpyridine with hydrogen fluoride in the presence of a catalyst of a fluoride of at least one metal selected from the group consisting of chromium, iron, nickel, manganese, cobalt and aluminum and diluent in a vapor phase at a temperature of 300° to 500° C. for a residence time of 1 to 60 seconds.
Claim 3
Dependent Claim
17 words
A process according to claim 1 wherein said catalyst is a fluoride of chromium, iron or aluminum.
Claim 4
Dependent Claim
19 words
A process according to claim 1 wherein said reaction temperature is in a range of 350° to 450° C.
Claim 5
Dependent Claim
23 words
A process according to claim 1 wherein said residence time of the reaction mixture is in a range of 1 to 20 seconds.
Claim 6
Dependent Claim
39 words
A process according to claim 1 wherein a solid catalyst is suspended in a gas flow containing said diluent, said starting material, said reaction product and hydrogen chloride to react said chloroβ-trichloromethylpyridine with hydrogen fluoride in a fluidized condition.
References Cited (Backward Citations)
US4101554A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |