Influence of different of ethanol percentages on pKa values for some imines derived from 3-acetyl and 4-acetyl pyridines

الملخص EN

The work is concerned with the influence of different ethanol percentages in the range (10-50)vol.

% at fixed 25Cº temperature on the values of ionization constants pKa for some acidic and basic imines .

These imines are derived 3-acetyl and 4-acetyl pyridines in a forms of syn or anti oxime and phenolic or amino Schiff bases , containing phenol and primary amine groups in ortho , meta and p-positions on the aromatic ring of primary amine sides The plots of pKa values of acids versus the dielectric constants (D) of different alcoholic media show a different linear or curve shapes .

These results were interpreted and discussed in details in this topic .