Vs. Mokrushin et Ma. Bezmaternikh, THE FIRST EXAMPLE OF REVERSIBLE C-AZO COUPLING IN A SERIES OF AROMATIC AND HETEROAROMATIC-COMPOUNDS, Mendeleev communications (Print), (5), 1998, pp. 197-198
Heating of imidazolyl- and phenylazo-naphthols in acetic acid in the p
resence of p-toiuenesulfonic acid and dimethylaniline yields imidazoly
l- and phenyl-(p-dimethylamino) azobenzenes, which suggests the interm
ediacy of the corresponding diazo compounds.