1-Nitroanthraquinone → 1-Aminoanthraquinone

Participants

Reaction Steps

750 ml of water and 324 g of Na2S.9H2O are heated to 90°-95° C. in a cylindrical reaction vessel (1.5 l capacity, diameter 10 cm, height 20 cm) with a lid fitted with three tubes, which is provided with an anchor stirrer (diameter 9 cm, anchor height 12 cm) and thermometer, 81 g of finely sieved 1-nitro-anthraquinone (content 73.9%) is then stirred in at the same temperature in the course of one hour and finally the mixture is subsequently stirred at 90°-95° C. for 30 minutes. The reaction mixture is filtered and the residue is washed with hot water until neutral and dried at 60° C. in vacuo. 71.3 g of crude 1-amino-anthraquinone of the following composition are obtained: 72.5% of 1-amino-anthraquinone=98% of theory, 3.1% of 1,5-diamino-anthraquinone, 2.8% of 1,8-diamino-anthraquinone, 3.0% of 1,6-diamino-anthraquinone, 3.1 % of 1,7-diaminoanthraquinone, 2.3% of anthraquinone, 5.9% of 2-amino-anthraquinone and 0.1% of 2,6-+2,7-diamino-anthraquinone.

Provenance & Evidence