Back to results
US 5,315,046 AGranted
Process for preparing ethane derivatives
AssigneeKali-Chemie Aktiengesellschaft
InventorsGuenter Fernschild, deceased, Werner Rudolph, Carsten Brosch
Life of this patent
Estimating the term…
Abstract
A process for preparing ethane derivatives containing the trifluoromethyl group in good yield is described which is carried out in liquid phase and is particularly suitable for preparing CF.sub.3 CHCl.sub.2 (R123).
Claims15
A process for preparing ethane derivatives of the general formula (I)
- CF.sub.3 CHYZ (I)
- in which Y and Z may be the same or different and Y is hydrogen, fluorine, chlorine or bromine and Z is hydrogen, fluorine, chlorine or bromine, comprising:
- reacting at least one ethane derivative corresponding to the formula II:
- CHal.sup.1 Hal.sup.2 Hal.sup.3 CHYZ (II)
- in which Y and Z have the above meanings, Hal.sup.1 is halogen, Hal.sup.2 is halogen and Hal.sup.3 is halogen with the exception of fluorine with essentially anhydrous hydrogen fluoride in liquid phase in the presence of an essentially anhydrous, catalytically active solution of a hydrogen fluoride addition compound corresponding to the formula III:
- H.sub.2 F.sup.+ (SbCl.sub.x F.sub.y).sup.- (III)
- in which x plus y=6, and x has an average value from 0 to 0.5 and y has an average value from 5.5 to 6, in hydrogen fluoride, and
- recovering the resulting ethane derivative of formula (I) from the reaction mixture.
5 more elements
Dependencies are inferred from the claim text.