Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Preparation of aromatic fluoro compounds
T993005 Preparation of aromatic fluoro compounds
Patent Drawings:

Inventor: Staniland
Date Issued: April 1, 1980
Application: 06/022,597
Filed: March 19, 1979
Inventors: Staniland; Philip A. (Tewin Wood, GB2)
Assignee: Imperial Chemical Industries Limited (London, GB2)
Primary Examiner:
Assistant Examiner:
Attorney Or Agent:
U.S. Class: 1/1
Field Of Search:
International Class:
U.S Patent Documents:
Foreign Patent Documents:
Other References:









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.
Claim:
Description:
 
 
  Recently Added Patents
Cup
Electronic communication device
Satellite mounting pole
Amnion-derived cells, methods of making and uses thereof
Sink
Techniques for data assignment from an external distributed file system to a database management system
Emergency whistle, flashlight, and compass
  Randomly Featured Patents
Electrically conductive pipe or cable clip
Swirling-type melting furnace and method for gasifying wastes by the swirling-type melting furnace
Test structures and method of defect detection using voltage contrast inspection
Cam shaft support apparatus for an engine
Heat transfer labeling manufacturing method
Image interpolation apparatus
Bezel having a pull out label
EAS ready paperboard
Clock regenerator
Propeller fan