Scheme 1 a, R= H b, R= p~ N (CH3) 2 g, R= a-OH give 5-benzylidene-2, 4-thiazolinedione, whose IR spectrum showed a carbonyl stretching band as a doublet (1670 and 1740 cm “). A similar conversion has been reported in the case of 2—isopropy1idenehydrazone-4- thiazolidinonefl) Furthermore, 53 was also obtained by the reaction of l with benzaldehyde acethylhydrazone in acetic acid. However, when 2 g was employed as the azine reactant, ...
