Tautomeric and Protonation Equilibria of Schiff Bases of Salicylaldehyde with Aminopyridines (CROSBI ID 78782)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Galić, Nives ; Cimerman, Zvjezdana ; Tomišić, Vladislav
engleski
Tautomeric and Protonation Equilibria of Schiff Bases of Salicylaldehyde with Aminopyridines
The equilibria of the Schiff bases of salicylaldehyde with 2-aminopyridine, 2, 3-diaminopyridine, 2, 6-diaminopyridine and 3-aminomethylpyridine were studied by means of spectroscopic methods. In non-polar solvents enolimines were predominantly present. In polar solvents rapid tautomeric interconversion of enolimines to ketoamines as well as slow hydrolysis were noted. The tendency to tautomeric interconversion was significant in the case of 2-(3-pyridylmethyliminomethyl)phenol, whereas in the case of other Schiff bases it was very low. The corresponding tautomeric constants were estimated in a variety of solvents on the bases of UV spectral data. The protonation constants of all compounds were determined in methanol/water mixtures by the spectrophotometric method and discussed with to their structural characteristics and solvent properties.
Schiff bases ; protonation constants ; tautomeric constants ; spectrophotometric method
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o izdanju
343
1997.
135-143
objavljeno
0003-2670
1873-4324
10.1016/S0003-2670(96)00586-7