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Preparation of aromatic fluoro compounds |
| T993005 |
Preparation of aromatic fluoro compounds
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| Inventor: |
Staniland |
| Date Issued: |
April 1, 1980 |
| Application: |
06/022,597 |
| Filed: |
March 19, 1979 |
| Inventors: |
Staniland; Philip A. (Tewin Wood, GB2)
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| Assignee: |
Imperial Chemical Industries Limited (London, GB2) |
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| U.S. Class: |
1/1 |
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| Abstract: |
The present invention relates to a process for the preparation of 4,4'-difluorobenzophenone. 4,4-difluorobenzophenone may be prepared by diazotization of 4,4'-diamino-diphenylmethane in anhydrous or concentrated aqueous hydrogen fluoride, decomposition of the diazonium fluoride thus produced to yield 4,4'-difluoro-diphenylmethane and oxidation of 4,4'-difluoro-diphenylmethane to yield 4,4'-difluorobenzophonone.Thus, according to the present invention, there is provided a process for the preparation of 4,4'-difluorobenzophenone which comprises the following steps:(1) diazotization of 4,4'-diamino-diphenylmethane in anhydrous or concentrated aqueous hydrogen fluoride to yield a solution of a corresponding diazonium fluoride; and(2) (i) thermally decomposing the diazonium fluoride in the solution thus produced to yield 4,4'-difluoro-diphenylmethane and (ii) subsequently oxidizing the 4,4'-difluoro-diphenylmethane to yield 4,4'-difluorobenzophenone. |
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