Hydrochloric Acid → HCID 178507708, compound

Participants

Reaction Steps

Chlorine is passed at 100° C. into a solution of 52.0 g of leuco-1,4-diaminoanthraquinone (94%) in 410 g of 96% strength H2SO4 until the leuco compound has just disappeared. Excess chlorine as well as hydrogen chloride is expelled by means of air. The batch is then allowed to cool down to room temperature, during which time 48.0 g of 1-aminoanthraquinone (98%) are added, and the mixture is then added dropwise to 410 g of water. 95.0 g of potassium peroxodisulphate are added in portions in the course of about 1 hour at 40°-50° C. to the paste. Stirring is allowed to continue for about 30 minutes at 30°-50° C., and the solids are filtered off with suction and washed with water until almost neutral. The press cake is washed with 300 ml of 10% strength NaHSO3 solution, and then with water, and dried at 100° C. 102.3 g of 4,4'-diamino-1,1'-dianthrimide (79% pure) are obtained; this result corresponds to 87% of theory.

Provenance & Evidence