Hydrochloric Acid → HCID 19912199, compound

Participants

Reaction Conditions

Reaction Steps

A stirred mixture of 12.0 g (0.0388 mole) of 1-(5-amino-2,4-dichlorophenyl)-4-difluoromethyl-4,5-dihydro-3-methyl-1,2,4-triazol-5(1H)-one in 50 mL of hydrochloric acid was cooled to 0° C. A solution of 2.79 g (0.0405 mole) of sodium nitrite in 20 mL of water was added while maintaining a reaction temperature of approximately 0° C. After complete addition, the reaction mixture was allowed to warm to room temperature and stir for 1.5 hours. This mixture was added slowly to a solution of 5.44 g (0.0405 mole) of copper (II) chloride in 15 mL of water and 50 mL of acetic acid which was saturated with sulfur dioxide. The resultant mixture was stirred at room temperature for one hour, forming a precipitate. The reaction mixture was poured into ice water and was stirred for a brief period of time. This mixture was filtered to collect approximately 16 grams of 1-(2,4-dichloro-5-chlorosulfonylphenyl)-4-difluoromethyl-4,5-dihydro-3-methyl -1,2,4-triazol-5(1H)-one as an off-white solid.

Provenance & Evidence