Potassium Nitrate → HCID 178481970, compound

Participants

Reaction Steps

Finely powdered potassium nitrate (0.47 g, 4.6 mmol) was added portionwise to a stirred solution of 7,8-dihydroxy-3-methyl-3H-1,2,3-triazolo[4,5-f]quinoxaline (1.0 g, 4.6 mmol) in 20 ml of conc. sulfuric acid at 0° C. After 1 h the ice bath was removed and the mixture was stirred over night at room temperature. Then an additional amount of potassium nitrate (0.47 g) was added and stirring was continued over night at room temperature. The solution was poured into ice/water and the precipitated solid was collected, washed with water, and dried to give 1.0 g (83%) of the pure nitro compound; m.p. >300° C.; IR (KBr): 1710 cm-1 ; 1H-NMR (DMSO-d6): 4.50 (s, 3H, CH3), 8.18 (s, 1H, ArH), 12.13 (broad s, 1H, OH), 13.17 (broad s, 1H, OH).

Provenance & Evidence