Process for the preparation of hexafluorobutane, and intermediates thereby obtainable
AssigneeBayer Aktiengesellschaft
InventorsNorbert Lui, Albrecht Marhold, Dietmar Bielefeldt
Life of this patent
Estimating the term…
Abstract
1,1,1,4,4,4-Hexafluorobutane is prepared by first reacting 1,1,3,4,4-pentachlorobuta-1,3-diene with hydrogen fluoride in the presence of catalysts at 60.degree. to 180.degree. C. to give 1,1,1,4,4,4-hexafluoro-2-chlorobutane, and converting this to 1,1,1,4,4,4-hexafluorobutane. On working up the product of the first stage of the process, it is possible to isolate novel compounds of formula (I): CF.sub.2 X--CH.sub.2 --R (I) in which X is fluorine or chlorine and R is --CHCl--CF.sub.2 Cl, --CHCl--CFCl.sub.2 or --CCl.dbd.CCl.sub.2.
Claims4
A process for the preparation of 1,1,1,4,4,4-hexafluorobutane, in which 1,1,3,4,4-pentachlorobuta-1,3-diene is first reacted with at least 6 mols of hydrogen fluoride per mol of pentachlorobutadiene in the presence of a Lewis acid catalyst at 60.degree. to 180.degree. C. to give 1,1,1,4,4,4-hexafluoro-2-chlorobutane, and converting said 1,1,1,4,4,4-hexafluoro-2-chlorobutane to 1,1,1,4,4,4-hexafluorobutane by means of elimination and hydrogenation.
Dependencies are inferred from the claim text.