Synthesis of new Schiff bases containing thiophene moiety

Seven new Schiff bases, which are 4,4,4-trifluorol-(2-thienyl)-l-butanone-3-Z, Z=-thiosemicarbazone (a); -thiocarbohydrazone (b),-benzoic hydrazone (c), -(o-hydroxyphenyl) imine (d) ,-nicotinic hydrazone (e) ,-salicylic hydrazone (f), and -(p-fluoro-m-chlorophenyl) imine (g), have been synthesized by reaction of 4, 4, 4-trifluoro-1-(2-thienyl)-l, 3-butanedione (TFTBD) with corresponding hydrazides or anilines, acetic acid orp-toluence sulfonic acid as catalyst, and characterized by Elemental analysis, IR, UV-Vis.1H NMR and MS. The MS spectra confirmed that the −C3=0 condensed with primary amino group. Tautomerism of the compounds is discussed.