Thioacetoacetanilide (I) was prepared through β, β-dimercaptobutyranilide by addition of H 2 S to acetoacetanilide. The acid dissociation constants (pK a) of I and thiothenoyltrifluoroacetone (II) were determined spectrophotometrically to be 6.21±0.03 and 4.38±0.09 in 50% acetonitrile, respectively. The pseudo-first order rate constant for the hydrolyses of I and II were (1.55±0.28)× 10-2 and (2.92±0.11)× 10-4 min-1 in 50% ...
