Potassium Nitrate → HCID 68129523, compound

Participants

Reaction Conditions

Reaction Steps

2-Benzimidazolylamino-2-imidazoline (10.96g 0.055 mol) was added cautiously to concentrated sulphuric acid (62 ml) cooled to -5°C. Potassium nitrate (5.5 g) in concentrated sulphuric acid (3.4 ml) was added dropwise with stirring maintaining the temperature at 0°C. After addition the reaction mixture was allowed to warm to room temperature overnight then poured onto ice/water (250g) with stirring. The resulting pale yellow crystals were filtered, washed with water and recrystallised from aqueous dimethylforamide to yield 2-(5-nitrobenzimidazolinyl)amino-2-imidazoline trihydrate (15.81g) as yellow microcrystals m.p. 257°-259°C.

Provenance & Evidence