PROCESS FOR PREPARING -α,α,α′,α-TETRAFLUORO-P-XYLENE Russian patent published in 1995 - IPC

FIELD: preparation of films and coatings. SUBSTANCE: the product is a,α,α′,α′ tatrafluoro-p-xylene; reagent 1 is -α,α,α′,α- tetrabromo-p-xylene, reagent 2 is antimony trifluoride. Synthesis condition: the temperature is 100-150 C, the pressure os 20-100 mm Hg in the absence of a solvent. The resulting products are removed form the reaction mixture. Antimony trifluoride is used in an excess of 30-70 wt % based on the stoichiometric amount. The yield is 62-78%. EFFECT: improved process. 2 tbl