Abstract
2′Hydroxychalcones react with hydrazine hydrate in water to form phenolic 4,5‐dihydro‐3,5‐diphenyl‐1H‐pyrazoles. Condensation of the pyrazoles with toluenesulphonylchloride in pyridine gave 4,5‐dihydro‐3,5‐diphenyl‐1‐toluenesulphonylpyrazoles.