Azines are prepared conveniently by heating aromatic aldehydes or ketones with various carbonyl reagents (hydrazine and its salts, semicarbazide and toluene-p-sulphonohydrazide) in polyphosphoric acid at 100° for a few minutes. Various dialkylaminophenylazines have been made by this route.
D. B. Mobbs and H. Suschitzky, J. Chem. Soc. C, 1971, 175 DOI: 10.1039/J39710000175
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