Acetic Anhydride → N-(5-methyl-1H-pyrazol-3-yl)acetamide

Reaction equation

C(=O)(O)[O-].[Na+].[NH2:6][C:7]1[CH:11]=[C:10]([CH3:12])[NH:9][N:8]=1.[C:13](OC(=O)C)(=[O:15])[CH3:14]>O>[C:13]([NH:6][C:7]1[CH:11]=[C:10]([CH3:12])[NH:9][N:8]=1)(=[O:15])[CH3:14]

Participants

Procedure

50.4 g (0.6 mol) of sodium bicarbonate were added in small amounts at room temperature to a solution of 19.4 g (0.2 mol) of 3-amino-5-methyl-1H-pyrazole in 200 cm3 of water. 37.8 cm3 (0.4 mol) of acetic anhydride were added dropwise to this solution and then the mixture was heated at reflux for 2 hours. The solution was subsequently brought back to room temperature, a white solid crystallized and was pulled dry on sintered glass and then washed with 100 cm3 of water. After drying under vacuum at 40° C., 16.6 g of the expected product were obtained in the form of pearlescent-white crystals, the melting point of which was between 210° C. and 212° C.