At present, there is a lot of research about the pyrazoline heterocyclic compound, its ring structure is being changed and new derivatives are being made, many of which have antimicrobial activity over the derivatives. Pyrazoline is the five-member heterocyclic ring which have two N atoms in nearby position and contains two endocyclic double bonds. Noteworthy consideration has been concentrated on pyrazolines and pyrazoline derivative due to their important pharmacological action. Some replaced pyrazolines have been stated near retain particular important pharmacological actions as antimicrobial, antifungal, antineoplastic, antidepressant, insecticidal, anticonvulsant, anti-inflammatory, antibacterial and antitumor properties.

Pyrazoline is dihydropyrazole having only one endocyclic double bond. Synthesis of pyrazoline derivatives from chalcones is an active arena of investigation due to established pharmacological result. In present study, chalcones were prepared by reacting of acetophenone with benzaldehyde. Then prepared chalcones react with isoniazid in the presence of glacial acetic acid results pyrazoline derivative. Physical parameters such as color, crystal structure, solubility, melting point, retardation factor (Rf) and % yield was evaluated. Confirmations of structures of all synthesized derivatives, were done by spectroscopic data of IR, 1HNMR and Mass spectroscopy. Also, all synthesized compounds were evaluated for antibacterial activity against B. subtilis, S. aureus, P.aeruginosa and E.coli, and antifungal activity was accomplished against C. albicans and A. niger at the different conc. and concluded that some compounds have excellent antimicrobial activity and most of the synthesized compounds exhibits moderate antimicrobial activity.