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US 5,181,992 AGranted
Separation of isomers, e. g., phenethyl bromide from 1-phenyl-1-bromoethane
AssigneeAtochem
InventorsRaymond Commandeur, Gilles Drivon, Elie Ghenassia
Life of this patent
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Abstract
Mixtures of isomers, e.g., mixtures of phenethyl bromide and 1-phenyl-1-bromoethane, are separated by (a) selectively condensing one such isomer with an aromatic compound bearing at least one aryl (nuclear) hydrogen atom, e.g., xylene, in the presence of a catalytically effective amount of a Friedel-Crafts catalyst, e.g., ferric chloride, and then (b) separating the product of condensation, e.g., phenylxylylethane, from the unreacted isomer.
Claims7
A process for the separation of two isomers of the formulae (I) and (II):
- ##STR6## in which A is an aryl radical or a substituted aryl radical;
- X is a halogen atom;
- R.sub.1 is X.sub.1, hydrogen or an alkyl radical;
- R.sub.2 is X.sub.2, H or an alkyl radical;
- X.sub.1 and X.sub.2 are also halogen atoms;
- and R.sub.3 is hydrogen or an alkyl radical, comprising:
- (a) condensing the isomer (I) with an aromatic compound bearing at least one aryl hydrogen, in the presence of a catalytically effective amount of a Friedel-Crafts catalyst;
- and
- (b) separating the product of condensation of step (a) from the isomer (II).
6 more elements
Dependencies are inferred from the claim text.