1-Phenylpyrazolones in alcoholic media form photochemically the corresponding azo-compounds by an intermolecular reaction between the ground state of (1) and the diazonium ion (9).
K. Tsutsumi, I. Takagishi, H. Shizuka and K. Matsui, J. Chem. Soc., Chem. Commun., 1976, 685 DOI: 10.1039/C39760000685
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