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

Abstract

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 .