A process for preparing (per)fluorohalogenethers having general formula (II):
RCF2OCFA-CAF2 (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 (per)fluorinated substituent, selected from the following groups:
linear or branched C1-C20 alkyl; C3-C7 cycloalkyl;
aromatic, C6-C10 arylalkyl or alkylaryl; C5-C10
heterocyclic or alkylheterocyclic; or a perfluoropolyether substituent T-Rf—
wherein T=—OCF2OCFA-CAF2, —OCF2XI,
wherein XI=F, CF3, Cl; Rf is a perfluorooxyalkylene
chain; by reaction of carbonyl compounds having formula R"COF (III) wherein R"=RO—,
or R"=Q-Rf— wherein Q=—OCOF, —OCF2XI;
in liquid phase with elemental fluorine and with olefinic compounds having formula
CAF=CAF (IV), at temperatures from -120 C. to -20 C.
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