Process for the preparation of tetrafluorohalogenbenzenes

摘要

The preparation of tetrafluorohalogenbenzene of formula C6F4HX, wherein X is Br or Cl, by reacting tetrafluorobenzene with the halogen with a ratio ranging from 0.5 to 1 mole of the halogen per mole of tetrafluorobenzene in the presence of a Lewis acid catalyst is carried out in the absence of a solvent of the oleum type.