A process for the preparation of (per)fluorinated mono-functional carboxyl compounds

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A process for the synthesis of (per)fluorinated monofunctional carbonyl compounds having the following formula (I) : F-A-RF-B-C(O)X1 wherein : X1 = F, CF3; A, B equal to or different from each other, are independently (per)fluoroalkylene or (per)fluorooxyalkylene groups; RF is -ORf1O- wherein Rf1 = perfluoroalkylene or -ORf2, wherein Rf2 is a perfluorooxyalkylene chain; said process comprising the following steps : A) obtainment of the formula (II) mono-hypofluorite : FO-CFX2-A-RF-B-C(O)X1 by partial fluorination with elemental fluorine of the carbonyl groups of the formula (III) compound : X2(O)C-A-RF-B-C(O)X1 in the presence of a formula MeFy catalyst, Me being an alkaline or alkaline-earth metal or Ag, y = 1 or 2; B) thermal decomposition of the compound (II) to give the compounds according to the following scheme : FO-CFX2-A-RF-B-C(O)X1 (II) - - - - - → F-A-RF-B-C(O)X1 (I) + (O)CFX2.