Process for the preparation of bromoanthraquinones

Details Process for the preparation of bromoanthraquinones Process for the preparation of bromoanthraquinones

1983-11-23

1985-09-24

Hollrah, Glennon H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260694, C07C 4968

Patent

active

045432147

ABSTRACT:
A process for the preparation of pure bromoanthraquinones by denitrobrominating corresponding nitroanthraquinones is described. The process comprises treating nitroanthraquinones of the formula I ##STR1## wherein X is hydroxy, mercapto, carboxy or halogen and m is 1, 2, 3 or 4 and n is 1 or 2, in the temperature range from 200.degree. to 350.degree. C.
Bromoanthraquinones of more than 95% purity are valuable starting materials for dye synthesis and can be used directly without further purification.

REFERENCES:
patent: 3530151 (1970-09-01), Hoare
patent: 3917723 (1975-11-01), Szczepanski et al.
patent: 4006171 (1977-02-01), Majer et al.
patent: 4206130 (1980-06-01), Herzog et al.

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