| 摘要 |
A process for preparing fluorovinylethers having general formula:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ R f O-CF=CF 2 ,€ƒ€ƒ€ƒ€ƒ€ƒ(IA)
wherein R f is a fluorinated or perfluorinated alkyl or cycloalkyl substituent;
comprising the following reaction steps:
1) reaction of a hypofluorite of formula RfOF, wherein Rf is as above, with an olefin of formula:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ CY"Y=CY'Cl€ƒ€ƒ€ƒ€ƒ€ƒ(II)
wherein Y, Y' and Y", equal to or different from each other, are H, Cl, Br, with the proviso that Y, Y' and Y" are not contemporaneously hydrogen;
2) dehalogenation or dehydrohalogenation of the fluorohalogenethers obtained in step 1) and obtainment of vinyl ethers of formula:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ RfO-CY I =CY II F€ƒ€ƒ€ƒ€ƒ€ƒ(IV)
wherein Y I and Y II , equal to or different from each other, have the meaning of H, Cl, Br with the proviso that Y I and Y II are not both H;
3) fluorination with fluorine of the vinyl ethers (IV) and obtainment of fluorohalogenethers of formula:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ RfO-CFY I -CF 2 Y II €ƒ€ƒ€ƒ€ƒ€ƒ(I)
wherein Y I , Y II , equal to or different from each other, are Cl, Br, H with the proviso that Y I and Y II cannot be contemporaneously equal to H;
4) dehalogenation or dehydrohalogenation of the fluorohalogenethers (I) and obtainment of the fluorovinylethers (IA). |
