Preparation and Characterization of new Knoevenagel condensation products of isophthalaldehyde and terephthal aldehyde with some active methylene compounds

six new products using Knoevenagel condensation of isophthalaldehyde and terephthalaldehyde have been prepared with the following active methylene compounds: malononitrile, methyl cyano acetate, ethyl cyano acetate, dimethyl malonate and diethyl malonate. We determined the optimum conditions of the reaction by studying the effect of solvent and catalyst nature and reaction conditions on the condensation. The products were purified by recrystallization from ethanol. The structures of the obtained compounds were established by IR, U.V, ¹H- NMR, ¹''3C –NMR -spectroscopies and elemental analysis (author).