Abstract
1-Substituted-3-(2,4-dimethoxyphenyl)-5-(3,4,5-trimethoxyphenyl)-4,5-dihydeopyrazoles were prepared via condensation of 3,4,5-(trimethoxy)benzal-2,4-(dimethoxy)acetophenone with hydrazine derivatives in ethanol and/or condensation with hydrazine hydrate in acidic medium. The product with ethyl iodide, phenyl isothiocyanate, benzoyl chloride and nitrous acid yielded the corresponding 1-substituted-3-(2,4-dimethoxyphenyl)-5-(3,4,5-trimethoxyphenyl)-4,5-dihydropyrazoles respectively. The antimicrobial activity of some new compounds has been screened.