| 摘要 |
A process for preparing (per)fluorohalogenethers having general formula (II): R'CF2OCFA-CA'F2 (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 alkyl aryl; C5-C10 heterocyclic or alkylheterocyclic; or a perfluoropolyether substituent T-R f- wherein T = -OCF2OCFA-CA'F2, -OCF2X I, wherein X I = F, CF3, Cl; R f is a perfluorooxyalkylene chain; by reaction of carbonyl compounds having formula R"COF (III) wherein R" = RO-, or R" - Q-R f- wherein Q = -OCOF, -OCF2X I; in liquid phase with elemental fluorine and with olefinic compounds having formula CAF=CA'F (IV), at temperatures from -120.degree.C to -20.degree.C.
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