Potassium Nitrate → HCID 178526415, compound

Participants

Reaction Steps

Finely powdered potassium nitrate (3.1 q, 30.7 mmol) was added to a stirred solution of 7,8-dihydroxy-1H-1,2,3-triazolo[4,5-f]quinoxaline (6.1 g, 30 mmol) in 50 ml of conc. sulfuric acid at 0° C. (ice bath). The mixture was stirred over night at room temperature. Then a further amount of potassium nitrate (3 g) was added with cooling on an ice bath, and stirring was continued for 5 h at room temperature. The mixture was poured into 700 ml of ice/water, and the yellow precipitate was isolated, washed with water, and recrystallized from ethanol giving 5.2 g (70%) of the title compound; m.p.>300° C.; IR (KBr): 3300-2200, 1700 cm-1 ; 1H-NMR (DMSO-d6): 8.13 (s, 1H, ArH), 11-16 (broad, 3H, NH+2OH).

Provenance & Evidence