Potassium Nitrate → HCID 178526417, compound

Participants

Reaction Steps

To a solution of 0,4 g (1,8 mmol) 7,8-dihydroxy-1,2,5-thiadiazolo(3,4-f)quinoxaline in 20 ml concentrated sulfuric acid was added at 0° C. 0,19 g (1,9 mmol) potassium nitrate. Stirring was continued at 0° C. for 30 min. and at 25° C. for 24 h. The reaction mixture was poured into 100ml ice-water to give 0,34 g (71%) 7,8-dihydroxy-4-nitro-1,2,5-thiadiazolo(3,4-f)quinoxaline as a precipitate, m.p.>300° C. NMR (DMSO-d6) 12,3 (1H, broad s), 11.6 (1H, broad s), 8.43 (1H,s).

Provenance & Evidence