Nitrobenzene → 1,4-Diamino-9,10-dioxo-9,10-dihydroanthracene-2-carbonitrile

Beteiligte Stoffe

Reaktionsschritte

A mixture of 174 g of 91.2 percent pure 1,4-diamino-anthraquinone-2-sulphonic acid (as the Na salt), 1,200 ccs of N-methyl-formamide, 63.7 g of sodium cyanide, 62.0 g of nitrobenzene and 41 g of sodium acetate is heated to 80°-85° C., whilst stirring, until, according to the TLC, the starting material has reacted without trace, that is to say for about 8 hours. The reaction mixture is worked up as described in Example 1. After drying, 133 g of a dark blue, crystalline product which, according to analysis, contains 85.5% of 1,4-diamino-2,3-dicyano-anthraquinone and no 1,4-diamino-2-cyanoanthraquinone are obtained. This corresponds to a yield of 78.9% of the pure product.

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