| 摘要 |
NEW MATERIAL:The fluorine-containing benzophenone of formula (X is F or Cl). EXAMPLE:3,3',4,4'-Tetrafluorobenzophenone. USE:A production raw material for pharmaceuticals, agricultural chemicals or various functional materials such as 4-difluorophenol useful as an intermediate for herbicide or synthetic intermediate for liquid crystal or 3-chloro-4- fluorophenol useful as an intermediate raw material for insecticide, etc. PREPARATION:A compound of formula wherein X is F can be produced by reacting 1,2-difluorobenzene with CCl4 in the presence of anhydrous aluminum chloride and hydrolyzing the reaction product in a medium acidified with sulfuric acid. |
