Novelsymmetricalbis-Schiffbases have been prepared cleanly and efficiently in the presence of formic acid catalyst in methanol from the reaction of symmetrical primary bis-amine of 5,5′-methylenebis(2-aminothiazole) (1) and a series of aromatic aldehyde derivatives under mild conditions. The advantages of this reaction are simplicity of the reaction procedure, simple work-up and pure products with