Claims
- 1. In an improved process for preparing a vinylene fluoride, the improvement comprising reacting under substantially anhydrous conditions in an inert polar solvent at a temperature of -40.degree. C. to about +80.degree. C. a ketone having at least one hydrogen atom on an alpha carbon atom and a disubstitutedaminosulfur trifluoride of the formula RR.sup.1 NSF.sub.3 wherein each R and R.sup.1, alike or different, is a primary alkyl group of 1-4 carbon atoms, or when taken together R and R.sup.1 are --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.5 --or --CH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 --, and recovering a vinylene fluoride.
- 2. The process of claim 1 in which the ketone is free of basic amino groups and .alpha.,.beta.-ethylenic unsaturation.
- 3. The process of claim 2 conducted in the presence of about 0.001% to 1% by weight of the ketone of an acid having a log K.sub.a of more than about -2.
- 4. The process of claim 2 wherein the polar solvent is tetrahydrofuran.
- 5. The process of claim 2 wherein the polar solvent is ethylene glycol dimethyl ether.
- 6. The process of claim 2 wherein the ketone is cyclic.
- 7. The process of claim 2 wherein the ketone is 6-ketocholestan-3.beta.-ol-acetate.
- 8. The process of claim 2 wherein the aminosulfur trifluoride compound is N,N-diethylaminosulfur trifluoride.
- 9. The process of claim 3 in which the acid is fuming sulfuric acid.
RELATED APPLICATION
This is a continuation-in-part of application Ser. No. 799,124 filed May 20, 1977 and subsequently abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3976691 |
Middleton |
Aug 1976 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
799124 |
May 1977 |
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