The photo-oxygenation of 4-phenylazo-1-naphthol (1) gives the dimer 4,4′-bis(phenylazo)-2,2′-binaphthyl-1,1′-diol (2) in organic solvents, with a particularly good yield (28%) in chloroform.
K. Itoho, Y. Furuya, T. Masuda and M. Takei, J. Chem. Soc., Chem. Commun., 1986, 208 DOI: 10.1039/C39860000208
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