Potassium Hydroxide → HCID 69691271, compound

Participants

Reaction Steps

A mixture of ethyl 3-methyl-1-(4-methoxyphenyl)-1 H-pyrazolecarboxylate (0.01997 mol, 5.197 g) and potassium hydroxide (3.362 g, 3.0 eq.) in ethanol (70 mL) was stirred at ambient temperature for 5 h. The solvent was removed in vacuo and the residue was taken up in water. This was extracted with methylene chloride (3×) to remove unreacted starting material. The aqueous was made acidic (pH 3) by the dropwise addition of conc. HCl at 0° C. to give white precipitation of acid. The solid acid was obtained by filtration and pumped on for several hours to dry. This procedure gave 4.23 g of pure product (91%); mp: 161.8° C.

Provenance & Evidence