US4329458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of 2,4,6-trifluoro-1,3,5-triazine
Assignee: Bayer AG
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Filing: 1981-02-26
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Granted: 1982-05-11
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Expires: 2001-02-26
Abstract
Abstract The present invention relates to a process for the preparation of 2,4,6-trifluoro-1,3,5-triazine (TFT) from 2,4,6-trichloro-1,3,5-triazine (TCT) or from mixed chlorinated/fluorinated 1,3,5-triazines by fluorination with sodium fluoride in dipolar aprotic solvents. The process is characterized in that TCT or mixed chlorinated/fluorinated 1,3,5-triazines or mixtures thereof are metered into a suspension of sodium fluoride in a dipolar, aprotic solvent, which is warmed to a temperature of between 120° C. and 220° C. and optionally contains a further solvent.
Inventors
- 👤 Erich Klauke
- 👤 Ernst Kysela
- 👤 Arnd Stuwe
- 👤 Alfons Dorlars
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:26
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/28
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
Process for the preparation of 2,4,6-trifluoro-1,3,5-triazine (TFT) from 2,4,6-trichloro-1,3,5-triazine (TCT) or from mixed chlorinated/fluorinated 1,3,5-triazines by fluorination with NaF in a dipolar, aprotic solvent, characterised in that TCT is metered into a suspension warmed to 120° C. to 220° C., of NaF in a dipolar, aprotic solvent, which optionally contains a further solvent.
Claim 2
Dependent Claim
53 words
Process for the preparation of 2,4,6-trifluoro-1,3,5-triazine (TFT) from 2,4,6-trichloro-1,3,5-triazine (TCT) or from mixed chlorinated/fluorinated 1,3,5-triazines by fluorination with NaF in a dipolar, aprotic solvent, characterised in that TCT is metered into a suspension warmed to 120° C. to 220° C., of NaF in a dipolar, aprotic solvent, which optionally contains a further solvent.
Claim 3
Dependent Claim
14 words
Process according to claim 1, characterised in that the dipolar, aprotic solvent is tetramethylenesulphone.
Claim 4
Dependent Claim
42 words
Process according to claim 1, characterised in that a further solvent which is inert and which has a boiling point between the boiling point of TFT and the boiling point of the dipolar, aprotic solvent is added to the dipolar, aprotic solvent.
Claim 5
Dependent Claim
36 words
Process according to claim 1, characterised in that TCT is employed as a melt or as a solution or suspension in one of the solvents employed in the reaction or in a mixture of these solvents.
Claim 6
Dependent Claim
28 words
Process according to claim 1, characterised in that TCT is metered in as a mixture with or solution in mixed chlorinated/fluorinated 1,3,5-triazines, or mixed chlorinated/fluorinated 1,3,5-triazines are used.
Claim 7
Dependent Claim
29 words
Process according to claim 1, characterised in that the further solvents used are preferably those which have boiling points between 120°-200° C. and which are halogenated hydrocarbons or alkylbenzenes.
Claim 8
Dependent Claim
31 words
Process according to claim 6, characterised in that the halogenated hydrocarbon employed as the further solvent is chlorobenzene or 1,2-dichlorobenzene and the alkylbenzenes are o-, m- or p-xylene, or mixtures thereof.
Claim 9
Dependent Claim
26 words
Process according to claim 3, characterised in that the second solvent is employed in an amount of 0.05-0.6 mol, relative to the dipolar, aprotic solvent employed.
References Cited (Backward Citations)
US3008798A
Cited
US3641020A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-10 | 1985-11-09 | 1986-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-10 | 1989-11-09 | 1990-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-10 | 1993-11-09 | 1994-05-11 | $7700.00 | Window Closed / Lapsed |