Schiff bases are a organic compounds that contain C=N bond and can be synthetised by condesation reaction of primary amines and aldehydes. During the Schiff bases synthesis, two factors are of importance and should be considered. The catalyst that is used in a formation of Schiff bases has to be mildly acidic (pH 3-5) to eliminate water molecule in order to form C=N bond in a compound. As a synthesis reactants, aminopyridines and dialdehydes, can be used in a mildly acidic conditions (HCl or CH3COOH) with ethanol as a solvent. Aminopyridines are compounds that contain pyridine ring that has amino group –NH2 attached on different carbon atom. There are three types of positional isomers of aminopyridines: 2-aminopyiridine, 3-aminopyridine, 4-aminopyridine. Under acidic conditions, nitrogen atom of amino group is deprotonated and reacts with a carbonyl aldehyde group and forms C=N bond. Dialdehyds are compounds that contain two carbonyl groups and by reacting with aminopyridines form C=N bond on both sides. They can be prepared by aldehydes and halogenalkanes on high temperature and dimethylformamide as a solvent. In this final paper, thirteen compounds were synthetised using methods of solution chemistry. Synthetised products were characterized by FT-IR spectroscopy, their mass has been weighed down and the melting point was determined for dialdehydes.