Process for the preparation of chloro-fluoro-butenes
AssigneeBayer Aktiengesellschaft
InventorsNorbert Lui, Albrecht Marhold, Dietmar Bielefeldt
Life of this patent
Estimating the term…
Abstract
Avoiding hexachlorobutadiene as the starting material, 2-chloro- and 2,3-dichloro-1,1,1,4,4,4-hexafluoro-2-butene are prepared by reacting a chlorobutene derivative of the formula (I) Cl.sub.2 C.dbd.CH-X (I) in which X represents CCl.dbd.CCl.sub.2 or CCl.sub.2 --CCl.sub.2 H with hydrogen fluoride and chlorine in the presence of a catalyst at temperatures in the range of 50 to 550.degree. C.
Claims5
A process for the simultaneous preparation of 2-chloro- and 2,3-dichloro-1,1,1,4,4, 4-hexafluoro-2-butene, whereby the amount of said 2, 3-dichloro-1,1,1,4,4,4-hexafluoro-2-butene produced is greater than the amount of said 2-chloro-1,1,1,4,4,4-hexafluoro-2-butene produced, which comprises reacting a chlorobutene derivative of the formula (I)
- Cl.sub.2 C.dbd.CH-X (I)
- in which
- X represents CCl.dbd.CCl.sub.2 or CCl.sub.2 --CCl.sub.2 --CCl.sub.2 H with hydrogen fluoride and chlorine in the presence of a catalyst at a temperature in the range of 50 to 550.degree. C.
Dependencies are inferred from the claim text.