Exchange and to the release of an amine from its carbamoyl fluoride

A process for the preparation of a compound comprising both a perfluorinated carbon and an aniline functional group from an aryl carbamoyl fluoride compound comprising chlorine atoms in place of the fluorine atoms on the perfluorinated carbon to obtain a partial exchange leaving at most one chlorine atom to be exchanged by molecule, said process comprising the steps of:

• a) reacting said aryl carbamoyl fluoride compound at a temperature of between −10° C. and 40° C. in a reaction mixture comprising hydrofluoric acid and water in a liquid phase with a ratio of hydrofluoric acid to the aryl carbamoyl fluoride being maintained during the reaction at a value at least equal to 4 and at most equal to 11 to obtain the compound comprising both a perfluorinated carbon and an aniline functional group,
• b) bringing said temperature at a value of between 30° C. and 50° C. and, then, adding water,
• c) increasing said temperature to a value of between 70° C. and 100° C., and
• d) recovering the compound comprising both a perfluorinated carbon and an aniline functional group obtained in step a).