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US 2004/0171896 A1Published application
Preparation of compounds with the CF3 group
AssigneeSolvay Fluor und Derivate GmbH
InventorsMax Braun, Carsten Brosch
Life of this patent
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Abstract
Highly fluorinated antimony, especially in the form of a hydrogen fluoride addition compound, can be used as an isomerization catalyst for the isomerization of certain halocarbon compounds or halogenated hydrocarbon compounds. For example, 1,1,1-trifluoro-2,2-dichoroethane can be produced from 1,1,2-trifluoro-1,2-dichloroethane. The method also is suitable for the purification of certain halocarbon or halogenated hydrocarbon compounds which are contaminated by isomerizable compounds.
Claims18
A method for preparing a compound corresponding to formula (I)
- CF3—CClXY (I)
- wherein
- X represents H, Cl or F, and
- Y represents H, Cl, F, C1-C3 alkyl, or C1-C3 alkyl substituted by at least one halogen atom,
- with the proviso that X and Y cannot simultaneously represent fluorine,
- said method comprising contacting at least one compound selected from the group consisting of compounds corresponding to formula (II)
- CF2Cl—CFXY (II)
- and compounds corresponding to formula (III)
- CFCl2—CF2Y (III),
- in which X and Y have the meanings given above,
- with an antimony compound corresponding to the formula SbCl0-0.5 F4.5-5.
8 more elements
Dependencies are inferred from the claim text.