m-Chloroperbenzoic acid → HCID 57073118, compound

Participants

Reaction Steps

A solution of 1-(4-formylphenyl)-1H-pyrazol-4-carboxylic acid methyl ester (5.0 g) in dichloromethane (100 ml) was treated with 3-chloroperbenzoic acid for 5 minutes at room temperature. The solution was heated at 50° C. for 4 hours, during which period additional 3-chloroperbenzoic acid (1.87 g) was added. After concentration, methanol (150 ml) and potassium carbonate (9.00 g) were added to the residue, and the mixture was stirred for 14 hours at ambient temperature. The reaction mixture was poured into water, adjusted to pH 8 with 1N HCl and the resulting precipitate was collected by filtration to give 1-(4-hydroxyphenyl)-1H-pyrazol-4-carboxylic acid methyl ester (0.51 g).

Provenance & Evidence