Process for separating an ar, ar-dihalo-ar-alkylbenzene from an

Details Process for separating an ar, ar-dihalo-ar-alkylbenzene from an Process for separating an ar, ar-dihalo-ar-alkylbenzene from an

1977-03-10

1978-08-01

Gantz, Delbert E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 2504

Patent

active

041043154

ABSTRACT:
In a mixture of isomers of ar,ar-dihalo-ar-alkylbenzene wherein the halogen substituents are meta oriented with respect to each other, (e.g., a mixture of 3,5-dichlorocumene and 2,4-dichlorocumene), the 2,4-dihalo-1-alkylbenzene is preferentially reacted with an alkylating agent, e.g., an alkyl halide, by contacting the mixture with the agent in the presence of a Friedel-Crafts catalyst at a temperature of less than about 90.degree. C. The resulting alkylated isomer is readily separated from the unreacted isomer(s) by simple distillation.

REFERENCES:
ohah et al., Aromatic Substitution XVIII, Friedel Crafts t-Butylation of Benzene and Methylbenzenes wt-Butyl Bromide & Isotulylene, JACS; 86, 3-20-64; p. 1060.

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