Process for the preparation of 4,5-dinitro-1,8-dihydroxyanthraqu

Details Process for the preparation of 4,5-dinitro-1,8-dihydroxyanthraqu Process for the preparation of 4,5-dinitro-1,8-dihydroxyanthraqu

1980-02-22

1982-08-03

Waltz, Thomas A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 4974

Patent

active

043427014

ABSTRACT:
95-99% pure 4,5-dinitro-1,8-dihydroxyanthraquinone which is essentially free from by-products is obtained by "direct nitration" of 1,8-dihydroxyanthraquinones or 1,8-dimethoxyanthraquinones if the concentrations of acid are chosen such that, when the nitration reaction and, if appropriate, the saponification reaction have ended, an 80-100% strength sulphuric acid is present, or such a sulphuric acid concentration is established by adding water, and the 4,5-dinitro-1,8-dihydroxyanthraquinone which crystallizes out is separated off.

REFERENCES:
patent: 3082218 (1963-03-01), Buxbaum et al.
patent: 3636008 (1972-01-01), Yamada et al.
patent: 3884943 (1975-05-01), Wimkle
patent: 4158009 (1979-06-01), Takeda et al.

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