Determination of ionization constants for some oxymes derived from benzyl compounds and heterocyclic aromatics

This research is concerned with the preparation of four aliphatic oraromatic oximes, prepared from benzil and heterocyclic aldehydes andthe determination of their pKa by potentiometric method. It is proved inthis study that oximes under investigation have hydrogen bonds, asidentified earlier by different physical method. A comparison ofpKabetween these oximes are performed at constant temperature and solventcomposition. The potentiornetric method was founded to be fast, simpleand precise with accLlracy in the rang +0.001 pKa unit.The study comes to conclusion that the type of isomer (alpha orbeta) in oximes, have a noticeable influence on pKa value of isomer.