Arylidene thiazolineone derivatives are synthesized by solid state condensation of aromatic aldehydes with 2,4 thiazolidinedione or N phenylrhodanine in the presence of NaAc at 120～140 ℃ for 10 min with yields of 55%～81 2%. The effect of reaction conditions are discussed. This is a simple, time saving and environmental friendly method for the preparation of 5 arylidene thiazolineone derivatives.
The knoevenagel condensation reaction of barbituric acid and aromatic aldehyde under ground and heated in solventless system was described. The reaction mechanism was also proposed. The structures of the products were identified by IR, 1H NMR, 13 C NMR and UV. 5 Alkylidene barbituric acid was the only product in the two reaction systems.
