Process for the preparation of aminobenzenesulfonic acids

Details Process for the preparation of aminobenzenesulfonic acids Process for the preparation of aminobenzenesulfonic acids

1991-08-12

1993-02-23

Ramsuer, Robert W.

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

Organic compounds

Sulfonic acids or salts thereof

562 73, 534632, 534638, C07C30930, C07C30946

Patent

active

051892065

ABSTRACT:
There is disclosed a process for the preparation of compounds of formula ##STR1## wherein the symbols are as defined in claim 1, which process comprises dissolving a compound of formula ##STR2## in sulfuric acid, adding this solution to oleum and reacting the mixture in the temperature range from 10.degree. to 80.degree. C. until a sulfo group has been completely introduced, and, in an optional further step, subjecting the reaction mixture to further reaction in the temperature range from 100.degree. to 200.degree. C. to introduce a second sulfo group.
The compounds of formula (1) obtainable by this process are useful intermediates for the synthesis of dyes and are particularly suitable diazo components for the synthesis of azo dyes.

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