| US 7,612,242 B2 | ||
| Process for preparing fluorohalogenethers | ||
| Vito Tortelli, Milan (Italy); Pierangelo Calini, Milan (Italy); Alberto Zompatori, Milan (Italy); and Emanuela Antenucci, Varese (Italy) | ||
| Assigned to Solvay Solexis S.p.A., Milan (Italy) | ||
| Filed on Dec. 06, 2006, as Appl. No. 11/634,145. | ||
| Claims priority of application No. MI2005A2455 (IT), filed on Dec. 22, 2005. | ||
| Prior Publication US 2007/0149827 A1, Jun. 28, 2007 | ||
| Int. Cl. C07C 41/22 (2006.01) | ||
| U.S. Cl. 568—685 [568/692] | 13 Claims |
| 1. 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).
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