Abstract
Analysis of the shielding of the13C nuclei in 1,3-diphenyl-5-arylformazanes permits evaluation of the position of the tautomeric equilibrium in the “red” formazanes. In the case of the electron-withdrawing p-NO2 substituent, the substituted ring is attached to the NHN=hydrazone fragment. An opposite effect is found for electron-donor substituents. In the case of ortho substituents, the shift of the tautomeric equilibrium is largely determined by steric factors.
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