Abstract
New series of thiazoles and thiadiazines incorporated with pyrazole ring were synthesized via the reaction of 2-(1-(4-cyano-1,5-diphenyl-1H-pyrazol-3-yl)ethylidene) hydrazine-carbothioamide or 4-imino-7-methyl-2,3-diphenyl-2H-pyrazolo[3,4-d]pyridazine-5(4H)-carbothiohydrazide with different reagents. The structures of all tautomeric forms of the newly synthesized compounds were confirmed on the basis of spectral data aided with DFT and semi-empirical calculations.