Process for the preparation of sulfonated anthranilic acids

Details Process for the preparation of sulfonated anthranilic acids Process for the preparation of sulfonated anthranilic acids

1992-05-28

1993-03-23

Chan, Nicky

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

Organic compounds

Sulfonic acids or salts thereof

562 73, C07C30929

Patent

active

051965739

ABSTRACT:
A process for the preparation of 4-sulfonated anthranilic acids by sulfonation of ortho-nitrotoluenes with chlorosulfonic acid or oleum followed by oxidation of the methyl group and, finally, reduction of the nitro group.

REFERENCES:
Chemical Abstracts, vol. 88, No. 13, Mar. 27, 1978, p. 486, H. Asakura, et al., "Synthesis of Some Nitrotoluenesulfonic Acids", 88:89276g.
Chemical Abstract, 65171y, vol. 18, 1974, p. 89, M. Kazimierczak, et al., "Preparation of 4-Sulfoanthranilic Acid by the Oxyreduction Method".
Houben-Weyl, Methoden der Organischen Chemie, vol. 11/1, pp. 360-490, "Stickstoff-Verbindungen II" (1957).

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