Information
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Patent Grant
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T993005
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Patent Number
T993,005
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Date Filed
Monday, March 19, 197945 years ago
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Date Issued
Tuesday, April 1, 198044 years ago
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Inventors
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Original Assignees
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US Classifications
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International Classifications
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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.
Priority Claims (2)
| Number |
Date |
Country |
Kind |
| 12664/78 |
Mar 1978 |
GBX |
|
| 32842/78 |
Aug 1978 |
GBX |
|
