Method of preparing 5-amino salicylic acid

Details Method of preparing 5-amino salicylic acid Method of preparing 5-amino salicylic acid

1987-07-07

1988-11-29

Reamer, James H.

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

Organic compounds

Carboxylic acids and salts thereof

534674, 260508, C07C 9900

Patent

active

047883316

ABSTRACT:
The disclosure relates to a method of producing 5-amino salicylic acid from salicylic acid, with sulphanilic acid as the recyclable auxiliary chemical.
The method according to the present invention includes linking between the diazonium salt of the sulphanilic acid and the salicylic acid, followed by a splitting by hydrogenation with hydrogen gas and catalyst, and selective precipitation of the desired product.

REFERENCES:
patent: 1542265 (1925-06-01), Norris et al.
patent: 1727468 (1929-09-01), Kammerer
patent: 2658673 (1953-11-01), Terpstra
patent: 3063980 (1962-11-01), Bloom et al.
patent: 4256634 (1981-03-01), Goebel et al.
Ginsburg, "Concerning Amines", pp. 21-22 (1968).
Sal'nikova et al., Chem. Abst; vol. 72, #99759a (1970).

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