Reducing meta content of isomeric mixtures of halo substituted t

Details Reducing meta content of isomeric mixtures of halo substituted t Reducing meta content of isomeric mixtures of halo substituted t

1998-11-17

2000-10-10

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570206, 570210, C07C 1738, C07C 2000

Patent

active

061303615

ABSTRACT:
Disclosed is a method of separating the meta isomer of a halotoluene having the general formula ##STR1## from a mixture with at least one other isomer, where X is Cl or Br. About 0.0001 to about 5 wt % of a Friedel-Crafts catalyst is added to the mixture and the mixture is exposed to a brominating agent which preferentially brominates the meta isomer. The mixture is then heated at a temperature above the boiling point of the other isomers but below the boiling point of the brominated meta isomer.

REFERENCES:
patent: 3655783 (1972-04-01), Bacha
patent: 4827058 (1989-05-01), Mais et al.

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