METHOD OF PREPARING MONO-AND DIBROMOPERFLUOROBENZENES OR CHLORINE CONTAINING ANALOGUES THEREOF Russian patent published in 1998 - IPC

FIELD: chemical technology of perhalogen benzenes. SUBSTANCE: present invention describes method of preparing mono- and dibromoperfluorobenzenes or chlorine containing analogues thereof which are used as intermediate products for synthesizing colorants, drugs or monomers. They are prepared by substitution of fluorine in hexafluorobenzene for biomine or chlorine by direct reaction of hexafluorobenzene with non-ionic, halogen containing material and activated carbon catalyst free from ionic halogen compounds at 300-500 C. Halogen containing alkanes, arenes, carbonyl halogen containing compound, Cl₂ and Br₂. EFFECT: lower process temperature, simplified reaction technology, and smaller amount of reactants. 1 tbl