eng Ansari Education and Research Society Journal of Ultra Chemistry 0973-3450 2319-8036 August 2009 5 2 271 278 juc 718 article Priyanka Kedia 1 Vandana Singh 1 Pooja Singh 1 Mamta Singh 1 Vidita Upadhyay 1 Daroga Singh 1 Synthetical Organic Research Lab., Department of Chemistry, T.D.P.G. College, Jaunpur (U.P.) 222 002 (INDIA) <p>The condensation of 2,4-dihydro-2,5-disubstituted-3H-pyrazol- 3-ones (1) with substituted benzaldehyde (2) in presence of glacil acetic acid gives 4-arylmethylene-2,4-dihydro-2,5-disubstituted-3H- pyrazol-3-ones (3). Similarly, the 4-arylmethylene-2,4-dihydro-2,5- disubstituted-3H-pyrazol-3-ones (3) reacts with thioureal/ phenyl thiourea / urea/ phenyl urea in presence of alkaline solution of ethanol at reflux temperature to give l,3-disubstituted-4-substituted phenyl-6-imino / phenylimino-4,7 -dihydro-1,3-thiazino / oxazino [5,4-d] pyrazoles. The antibacterial activities of the compounds (4) were tested against <em>S. aureus and B. cereus</em> bacteria.</p> <p>&nbsp;</p> https://journalofchemistry.org/paper/718/ Pyrazoles thiazino / oxazino-pyrazoles Antibacterial activity of pyrazoles.