Production of virtually pure 1-amino-8-nitro-4,5-dihydroxyanthra

Details Production of virtually pure 1-amino-8-nitro-4,5-dihydroxyanthra Production of virtually pure 1-amino-8-nitro-4,5-dihydroxyanthra

1978-06-20

1979-05-15

Curtis, Allen B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260689, C09C 9726

Patent

active

041547470

ABSTRACT:
A process for the preparation of 1-amino-8-nitro-4,5-dihydroxyanthraquinone by partially reducing the corresponding dinitrohydroxyanthraquinone and isolating the reduction product, in which crude 1,8-dinitro-4,5-dihydroxyanthraquinone obtained by nitrating 4,5-dihydroxyanthraquinone is partially reduced in a phenol-water mixture, which contains from 5 to 50% by weight of water, in the presence of an alkali metal phenolate, by means of a reductone, reductonate or a mixture of these. The product is virtually free from by-products and is suitable for use for the synthesis of dyes.

REFERENCES:
patent: 2068371 (1937-01-01), Buxbaum
patent: 2684359 (1954-07-01), Sogn
patent: 3060200 (1962-10-01), Buecheler
patent: 4048199 (1977-09-01), Elser et al.

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