| abstract |
Process for preparing 4, 4'-difluorobenzophenone, characterized in that, in a first step, fluorobenzene is reacted with formaldehyde under catalysis by organic sulphonic acids to give difluorodiphenylmethane, the product obtained is isolated, and, in a second step, oxidized with nitric acid to give 4,4'-difluorobenzophenone. 4,4'-Difluorobenzophenone (4,4'-DFBP) is the central starting material for the preparation of aromatic polyether ketones. |