The synthesis and characterization of a variety of aromatic oligo-azomethine, by thermal polymerization of news monomer catalyzed by concentrated HCl, is reported. The new oligo-azomethine has been characterized using Uv-visible, infrared, H-1-NMR and C-13-NMR spectroscopy. Other techniques such as elemental analysis and thermo-gravimetric analysis are also presented. The oligomeric material was synthesized by condensation between the ester group and the amine group. Surprisingly the oligomeric material retains the OCH2CH3 groups and it becomes bound to the C=N groups. The new type of monomers (aminophenyl ester) allow, at the first time, to introduce substituent covalent bonds to carbon atom of imine groups.