Nitric Acid → HCID 178514693, compound

Participants

Reaction Steps

To a solution of 1,0 g (3,4 mmol) 2,3-dihydroxy-7-sulphamoylbenzo[f]quinoxaline in 25 ml concentrated sulfuric acid was added at 0° C. 0,15 ml 100% nitric acid. Stirring was continued at 0° C. for 30 min, and then the mixture was poured into 100 ml ice-water to give a precipitate. The crude product was recrystallized (dimethylformamide-water) to give 0,7 g (61%) 2,3-dihydroxy-6-nitro-7-sulphamoyl-benzo[f]quinoxaline, m.p. 360° C. NMR (DMSO-d6): 12,4 (1H, broad s), 12,3 (1H, broad s), 8.7 (1H, d), 8.5 (1H,d), 8.17 (1H,s), 7.9 (1H,t), 7.4 (2H, broad s).

Provenance & Evidence