Sulfuric Acid → HCID 3915367, compound

Participants

Reaction Steps

50 parts of crystalline boric acid are dissolved in 1,000 parts of 30% strength oleum. 100 parts of 1,8-dinitroanthraquinone (analysis: 97.6% of 1,8-DNA; 0.8% of 1,5-DNA) are then added at room temperature with stirring. 15 parts of pulverulent sulphur are then added in portions at a temperature of 50° C. in the course of 45 minutes. The reaction mixture is further stirred for 1 hour at 50° C., cooled down to room temperature and then diluted with cooling by means of 211 parts of 78% strength sulphuric acid and then with 525 parts of water. The precipitated reaction product is filtered off with suction and washed with 133 parts of 60% strength sulphuric acid and thereafter with warm water until neutral. 64.5 parts of 1-hydroxy-4-amino-5-nitroanthraquinone are obtained which after recrystallisation from N-methylpyrrolidone melts at 270° C.

Provenance & Evidence