Process for preparing fluorohalogenethers

A process for preparing perfluoroalkylvinylethers having the general formula:

• RfO—CF═CF2 (IA)
• wherein Rf is a C1-C3, perfluorinated substituent;
• comprising the following steps:
• 1) reaction of a hypofluorite of formula RfOF, wherein Rf is as above, with an olefin selected from the group consisting of:
• trichloroethylene;
• 1,2-dichloroethylene;
• and 1,1-dichloroethylene;
• 2) dehalogenation or dehydrohalogenation of the fluorohalogenethers obtained in step 1) and obtainment of vinyl ethers of formula:
• RfO—CYI═CYIIF (IV)
• wherein YI and YII are selected from the group consisting of H, Cl, and Br with the proviso that one of YI and YII is H;
• 3) fluorination with fluorine of the vinyl ethers (IV) and obtainment of fluorohalogenethers of formula:
• RfO—CFY1—CF2YII (I)
• wherein YI, YII and Rf are as above;
• and
• 4) dehydrohalogenation of the fluorohalogenethers of formula (I) and obtainment of vinyl ethers of formula:
• RfO—CF═CF2 (IA).