In the inverse Diels–Alder reactions of mono-substituted s-tetrazines, 3-p-tolyltetrazine and phenyl-acetylene gave 3,4-diphenylpyridazine, while the same tetrazine and methylacetylene gave the 3,5-disubstituted product.
O. Meresz and P. A. Foster-Verner, J. Chem. Soc., Chem. Commun., 1972, 950 DOI: 10.1039/C39720000950
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