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Novel series of diversely substituted acetyl pyrazoline having biphenyl carbonitrile motif have been synthesized. The reaction of 2-cyno-4’-bromomethyl biphenyl with1-(4-hydroxy-phenyl)-ethanone resulted in acetophenone derivative of biphenyl-2-carbonitrile. This acetophenone derivative was condensed with substituted aromatic aldehyde in mixed solvent resulted in various substituted chalcones. These chalcones were further cyclized using hydrazine hydrate in presence of glacial acetic acid to produce titled compound derivatives. The chemical structures of synthesized compounds were elucidated by  1 H-NMR,  13 C-NMR FT-IR and mass spectra. Synthesized compounds were screened for their antimicrobial activity by broth dilution method. Out of twelve newly synthesized compounds, eight compounds are found to be equipotent to Ampicillin.

Synthesis and Antimicrobial Activity of Novel Series of Diversely Substituted Acetyl Pyrazoline Bearing Biphenyl Carbonitrile Motif