Comportement de 1‐(3,4‐Diméthyl‐5‐Isoxazolyl)‐3‐Aryltriazenes et de Diaryl‐1,3Triazenes Sous L'Impact Electronique

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Abstract
The mass spectra of 1‐(3,4‐dimethyl‐5‐isoxazolyl)‐3‐aryltriazenes may be interpreted on the predominance, in the vapor phase, of the structure A in which the azo group is conjugated with the heterocyclic moiety. This tautomer generates an isoxazolyl diazonium ion b wich rearranged before the loss of nitrogen. Para substituents on the aromatic ring have a weak influence on the displacement of this tautomeric equilibrium.Similarly, the mass spectra of 3‐aryl‐1‐p‐tolyl‐triazenes show that the equilibrium is only weakly influenced by the position and the nature of the substituent on the aromatic ring.