Attempts of Valence Isomerization on Substituted 2‐Phenyl‐4‐phenylazo‐benzotriazoles: Limits of theBoulton‐KatrizkyRearrangement Substituted 2‐phenyl‐4‐phenylazo‐benzotriazoles are prepared and their UV./VIS.,1H‐NMR. and mass spectra discussed. A thermic or photochemical valence tautomerization according to theBoulton‐Katritzkyrearrangement could not be proved.
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Balli et al. (1978) studied this question.
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