Process for the preparation of 1-amino-2-bromo-4-hydroxyanthraqu

Details Process for the preparation of 1-amino-2-bromo-4-hydroxyanthraqu Process for the preparation of 1-amino-2-bromo-4-hydroxyanthraqu

1986-01-24

1987-03-10

Hollrah, Glennon H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 9726

Patent

active

046489940

ABSTRACT:
The invention discloses a process for the preparation of 1-amino-2-bromo-4-hydroxyanthraquinone by brominating 1-aminoanthraquinone in the 2- and 4-position in concentrated sulfuric acid and subsequently hydrolyzing the 1-amino-2,4-dibromoanthraquinone obtained as intermediate, which process comprises removing excess bromine and/or hydrobromic acid formed during the bromination from the reaction mixture and carrying out the hydrolysis at elevated temperature in the presence of an aldehyde. 1-Amino-2-bromo-4-hydroxyanthraquinone is an important intermediate for dyestuff synthesis and is used in particular for synthesizing anthraquinoid disperse dyes.

REFERENCES:
patent: 2368682 (1945-02-01), Seymour et al.
patent: 2604480 (1952-07-01), Seymour et al.
patent: 4197250 (1980-04-01), Redeker et al.
patent: 4235789 (1980-11-01), Stout
patent: 4292247 (1981-09-01), Mishikuri et al.
Ullmanns Encyklopadie der Technischen Chemie, 4th edition, vol. 7, (1974).
Houben-Weyl, vol. VII/3c (1979).

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