Patent ID: 7019177

Claim:
A process for preparing (per)fluorohalogenethers having general formula (II): R′CF 2 OCFA-CA′F 2 (II) wherein: A and A′, equal to or different from each other, are H, Cl or Br but they cannot be both H; R′ has the following meanings: RO—, wherein R is a fluorinated or (per)fluorinated substituent, selected from the following groups: linear or branched C 1 –C 20 alkyl; C 3 –C 7 cycloalkyl; aromatic, C 6 –C 10 arylalkyl or alkylaryl; C 5 –C 10 heterocyclic or alkylheterocyclic; when R is fluorinated, it optionally contains one or more atoms of H and/or one or more halogen atoms different from F; when R is alkyl, cycloalkyl, arylalkyl, alkylaryl, alkylheterocyclic, it optionally contains in the chain one or more oxygen atoms; a perfluoropolyether substituent T-R f — wherein T=—OCF 2 OCFA-CA′F 2 , —OCF 2 X 1 , wherein X 1 =F, CF 3 , Cl; R f is a perfluorooxyalkylene chain containing one or more of the following units statistically distributed along the chain: (C 3 F 6 O), selected between (CF 2 CF(CF 3 )O) or (CF(CF 3 )CF 2 O); (CFX 1 O) wherein X 1 is F or CE 3 ; (C 2 F 4 O); (CF 2 (CF 2 ) x′ CF 2 O) wherein x′ is an integer equal to 1 or 2; by reaction of carbonyl compounds having formula (III): R″COF (III) wherein R″=RO—, wherein R is as above; or R″=Q-R f — wherein: Q=—OCOF, —OCF 2 X 1 wherein X 1 is as above; R f is as above; in liquid phase with elemental fluorine and with olefinic compounds having formula: CAF=CA′F (IV) wherein A and A′ are as above, at temperatures from −120° C. to −20° C., optionally in the presence of a solvent inert under the reaction conditions.