Addition of 1-diethylaminoprop-1-yne to dehydrodithizone yields 3-phenylazo-5-diethylamino-4-methyl-1-phenylpyrazole, whose structure has been established by single crystal X-ray structure analysis; the formation of this compound and that of an analogous product from 1-dimethylamino-2-phenylacetylene is thought to involve the hitherto unknown acyclic valency tautomer of dehydrodithizone.
G. V. Boyd, T. Norris and P. F. Lindley, J. Chem. Soc., Chem. Commun., 1974, 639 DOI: 10.1039/C39740000639
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