Potassium Nitrate → HCID 178430971, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 7-Methyl-1H-benzimidazole-4-carboxylic Acid (22) (4.944 g, 28.10 mmol) and concentrated H2SO4 (30 mL) is heated to about 60° C. to obtain a solution which is then cooled to about 0° C. To this solution is added KNO3 (3.12 g, 30.9 mmol) portionwise, so as to maintain the internal reaction temperature <10° C. Following complete addition, the cooling source is removed and the reaction mixture is allowed to warm to ambient temperature, whereupon the mixture is stirred for about 1 hour. The reaction mixture is then added to ice water (100 mL) and held at about 0° C. for about 4 hours. The resulting solids are filtered, washed with water, and dried to provide 7-Methyl-6-nitro-1H-benzimidazole-4-carboxylic Acid (23) as an off white solid (6.12 g, 98% Yield).

Provenance & Evidence