Claims
- 1. A process for preparing perfluorodioxoles having the following formula: ##STR18## wherein: R.sub.F is a perfluoroalkyl radical having from 1 to 5 carbon atoms; and X.sub.1 and X.sub.2, equal or different from each other are F or CF.sub.3,
- which comprises:
- .degree. ) reacting at a temperature of from -140.degree. C. to +60.degree. C. a dioxole of formula: ##STR19## (wherein X.sub.1 and X.sub.2, equal or different from each other, are F or CF.sub.3) with a fluorooxycompound of formula R.sub.F OF (wherein R.sub.F is a perfluoroalkyl radical having from 1 to 5 carbon atoms), obtaining a dioxolane of formula: ##STR20## .degree. ) dehalogenating the dioxolane (III) by reaction with a metal in an aprotic polar solvent.
- 2. A process for preparing perfluorodioxoles having the following formula: ##STR21## wherein: R.sub.F is a perfluoroalkyl radical having from 1 to 5 carbon atoms; and X.sub.1 and X.sub.2, equal or different from each other, are F or CF.sub.3,
- which comprises:
- .degree. ) reacting at a temperature of from -140.degree. C. to -20.degree. C. an olefin of formula
- R.sub.F --O--CCl.dbd.CFCl (X)
- (wherein R.sub.F is a perfluoroalkyl group having from 1 to 5 carbon atoms) with a bisfluorooxy compound of formula
- CX.sub.1 X.sub.2 (OF).sub.2 (XI)
- (wherein X.sub.1 and X.sub.2, equal or different from each other, are F or CF.sub.3), obtaining a dioxolane of formula: ##STR22## .degree. ) dehalogenating the dioxolane (III ) by reaction with a metal in an aprotic polar solvent.
- 3. A process for preparing fluorodioxoles having the following formula: ##STR23## wherein: R.sub.F is perfluroalkyl radical having from 1 to 5 carbon atoms; and X.sub.1 and X.sub.2, equal or different from each other, are F or CF.sub.3,
- which comprises reacting at a temperature of from 50.degree. to 150.degree. C., a gaseous flow of the dioxolane of formula: ##STR24## optionally in admixture with the dioxolane of formula ##STR25## (wherein R.sub.F is a perfluoroalkyl group having from 1 to 5 carbon atoms and X.sub.1 and X.sub.2, equal or different from each other, are F or CF.sub.3) with KOH in the solid state.
Priority Claims (1)
Number |
Date |
Country |
Kind |
MI93A1445 |
Jul 1994 |
ITX |
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Parent Case Info
This is a division of U.S. application Ser. No. 08/466,387, filed Jun. 6, 1995, U.S. Pat. No. 5,495,828 which was a divisional of U.S. application Ser. No. 08/270,149, filed Jul. 1, 1994 U.S. Pat. No. 5,498,682.
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Entry |
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Divisions (2)
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Number |
Date |
Country |
Parent |
466387 |
Jun 1995 |
|
Parent |
270149 |
Jul 1994 |
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