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The addition of phenol and effect of temperature and pH on the U.V. spectra of ortho, meta and para benzilnyledene aniline in ethanol as a solvent was studied. The thermodynamic parameters (G, H, S) were calculated in which the values of (G, H) are positive while the (S) is negative these support that the change in tautomerism shift to spontaneous and endothermic with systematic in (keto) form than (enol) form.