When 3,6-diphenyl-4,5-dehydropyridazine (1) is generated in the vapour phase, by pyrolysis of the pyridazotriazine (2) or by pyrolysis of its furan adduct (5), it reacts by extrusion of nitrogen to give diphenyl-butadiyne rather than by dimerisation.
T. L. Gilchrist, G. E. Gymer and C. W. Rees, J. Chem. Soc., Chem. Commun., 1973, 819 DOI: 10.1039/C39730000819
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