| 摘要 |
A process for preparing perfluorovinylethers 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 C 1 -C 3 alkyl perfluorinated substituent; comprising the following steps:
1a) fluorination with fluorine of olefins 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;
and obtainment of fluorohalogencarbons of formula:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ FCY"Y-CY'ClF€ƒ€ƒ€ƒ€ƒ€ƒ(III)
wherein Y, Y' and Y" are as above;
2a) dehalogenation or dehydrohalogenation of the fluorohalogencarbons (III) and obtainment of fluorohalogen olefins of formula:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ FCY 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;
3a) reaction between a hypofluorite of formula R f OF and a fluorohalogenolefin (IV), obtaining the 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;
4a) dehalogenation or dehydrohalogenation of the compounds (I) and obtainment of the perfluorovinylethers (IA). |
