Manufacture of 1-amino-2-bromo-4-hydroxyanthraquinone

Details Manufacture of 1-amino-2-bromo-4-hydroxyanthraquinone Manufacture of 1-amino-2-bromo-4-hydroxyanthraquinone

1978-03-16

1980-04-08

Douglas, Winston A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260687H, C07C 9726, C09B 150

Patent

active

041972503

ABSTRACT:
In a process for the manufacture of 1-amino-2-bromo-4-hydroxyanthraquinone by hydroxylating previously prepared and isolated 1-amino-2,4-dibromoanthraquinone in sulfuric acid in the presence of boric acid at from 110.degree. to 130.degree. C., the improvememt that 1-aminoanthraquinone is brominated (from 1.5 to 2.1 moles of bromine per mole) in sulfuric acid of from 50 to 85 percent strength at from 80.degree. to 130.degree. C., the reaction mixture is brought to a concentration of from 96 percent strength sulfuric acid to 5 percent strength oleum by adding oleum; and the dibromo compound is then hydroxylated in the presence of boric acid. Very pure 1-amino-2-bromo-4-hydroxyanthraquinone, which can be used for all purposes, is obtained in a high yield.

REFERENCES:
patent: 2604480 (1952-07-01), Seymour et al.
BiOS Final Report, vol. 1484, p. 5.

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