Preparation of 1,4-diamino-2,3-dicyanoanthraquinone

Details Preparation of 1,4-diamino-2,3-dicyanoanthraquinone Preparation of 1,4-diamino-2,3-dicyanoanthraquinone

1987-12-24

1989-10-03

Hollrah, Glennon H.

Organic compounds -- part of the class 532-570 series

Organic compounds

Polycyclo ring system containing anthracene configured ring...

C07C 9724

Patent

active

048714810

ABSTRACT:
1,4-Diaminoanthraquinone-2-sulfonic acid or salts thereof are reacted with cyanide ions at pH 8-11 in the presence of oxidizing agents in a mixture of water and 1-methoxy-2-propanol, 2-methoxy-1-propanol, N,N-dimethylformamide, N,N-dimethylacetamide, N,N-dimethylpropionamide, dimethyl sulfoxide, dioxane, N-methylpyrrolidone or mixtures thereof, the ratio water: organic liquid being .gtoreq.3:1, the reaction proceeding at higher concentrations than in a purely aqueous medium and producing appreciably purer products in a high space-time yield.

REFERENCES:
patent: 901059 (1862-07-01), Braun et al.
patent: 1938029 (1933-12-01), Kugel
patent: 4294769 (1981-10-01), Krock et al.
patent: 4299771 (1981-11-01), Takeshita et al.
patent: 4661292 (1987-04-01), Schaulin et al.

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