Process for the preparation of hexafluorobutane, and intermediates thereby obtainable

US5315047A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Norbert Lui · Odenthal, DE
• Albrecht Marhold · Leverkusen, DE
• Dietmar Bielefeldt · Ratingen, DE

Key dates

• Filing date: Apr 15, 1993
• Grant date: May 24, 1994
• Expiry date: Apr 15, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C19/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

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): EQU CF.sub.2 X--CH.sub.2 --R (I) in which PA0 X is fluorine or chlorine and PA0 R is --CHCl--CF.sub.2 Cl, --CHCl--CFCl.sub.2 or --CCl.dbd.CCl.sub.2.