3-(5-Nitrofuran-2-yl)-1-phenyl-1H-pyrazole-4-carbonyl chloride → 3-(5-Nitro-2-furyl)-1-phenylpyrazole-4-carboxylic acid anhydride

Participants

Reaction Steps

Add a solution of 0.64 g of 3-(5-nitro-2-furyl)-1-phenylpyrazole-4-carboxylic acid chloride dropwise to a warm solution of 0.60 g of 3-(5-nitro-2-furyl)-1-phenylpyrazole-4-carboxylic acid in 10 ml of dioxane and 0.48 ml of pyridine at 40° C. Stir the resulting reaction mixture at from 45° to 50° C for 6 hours. Draw off the formed precipitate and recrystallize it from dimethylformamide to obtain 3-(5-nitro-2-furyl)-1-phenylpyrazole-4-carboxylic acid anhydride [m.p. 262° to 264° C].

Provenance & Evidence