A process for producing fluorine-containing compounds in high purity

The invention concerns a method for producing compounds containing fluorine characterised in that it consists in reacting a compound containing one or several halogen atoms capable of being replaced by fluorine with a fluoride corresponding to general formula (I) KAT F-, in which KAT represents an alkaline metal ion, NH4 , an alkaline-earth metal ion or a residue corresponding to general formula (II) A A A A N , in which A , A , A , A correspond to the definition given in the description, in the presence of a compound or a mixture of compounds corresponding to general formula (III), in which A , A , A , A , A , A , A , A correspond to the definition given in the description and B represents a monovalent acid residue or the equivalent of a polyvalent acid residue, and in the presence of one or several compounds corresponding to general formula IVa: X-NO2 and/or IVb: X-SO-X', where X and X', independently of each other identical or different correspond to the definition given in the description, in the presence or not of a solvent, at temperatures ranging between 40 DEG C and 260 DEG C.