Water → HCID 12922309, compound

Participants

Reaction Conditions

Reaction Steps

4-Hydroxy-1,2-dimethyl-3,5-diphenylpyrazolium perchlorate (7 g, 0.02 mole) in DMSO (2.5 ml) is added to 5% sodium hydroxide (0.84 g, 0.02 mole) in DMSO (100 ml), dropwise with stirring. The mixture is warmed to 60°C for 5 minutes, then stirred at room temperature for 4 hours. The reaction mixture (75 ml) is treated with methyl iodide (0.43 g, 0.013 mole) and the mixture is stirred at room temperature for 16 hours, then heated at 40°C for 2 hours. On pouring into water, a solid precipitates with melting point 88°C. One crystallization from methanol gives the product with melting point 132°-132.5°C in 53% yield.

Provenance & Evidence