Claims
- 1. A process for producing a mixture containing 2,4,5-trifluoro benzoyl fluoride and 2-chloro-4,5-difluoro-benzoyl fluoride and less than 1% by weight of 4-chloro-2,5-difluoro-benzoyl fluoride which comprises reacting 2,4-dichloro-5-luoro-benzoyl chloride with 3.1 to 4.5 moles of potassium fluoride per mole of 2,4-dichloro-5-fluoro-benzoyl chloride in an aprotic solvent and thereafter distilling the reaction mixture.
- 2. The process of claim 1, in which from 1.05 to 2.0 mol of potassium fluoride are employed per equivalent of chloride atoms to be substituted.
- 3. The process of claim 1, in which the aprotic solvent employed is dimethyl-formamide, dimethyl sulphoxide, N-methylpyrrolidone, dimethyl sulphone or tetramethylene sulphone.
- 4. The process of claim 1, which is carried out at a temperature from 150.degree. to 270.degree. C.
- 5. The process of claim 1, in which the reaction time is between 1 and 12 hours.
- 6. The process of claim 1, which is carried out at a pressure in the range from 0.5 to 5 bar.
Priority Claims (1)
Number |
Date |
Country |
Kind |
44 09 578.3 |
Mar 1994 |
DEX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/403,313, filed on Mar. 14, 1995 which is abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4851160 |
Peterson et al. |
Jul 1989 |
|
4990661 |
Petersen et al. |
Feb 1991 |
|
5072038 |
Klauke et al. |
Dec 1991 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
0164619 |
Dec 1985 |
EPX |
0266512 |
May 1988 |
EPX |
3420796 |
Dec 1985 |
DEX |
Continuations (1)
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Number |
Date |
Country |
Parent |
403313 |
Mar 1995 |
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