The synthesis of [1,2,4]triazolo[1,5-a]pyrimidinium betaines (5) are described and the structure of their 1:2 adducts (8) with dimethyl acetylenedicarboxylate determined.
H. Marley, K. J. McCullough, P. N. Preston and S. H. B. Wright, J. Chem. Soc., Chem. Commun., 1987, 112 DOI: 10.1039/C39870000112
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