The first synthesis of 1-alkyl-4-(azolylidene)-1,4-dihydropyridines(2A)↔(2B) is described; their physicochemical properties clearly indicate a significant contribution of the dipolar structure(2B) to the ground state of (2) and this has been confirmed by the X-ray crystal structure of 1-methyl-4-(benzimidazolylidene)-1,4-dihydropyridine(4a).
E. Alcalde, I. Dinarés, J. Frigola, J. Rius and C. Miravitlles, J. Chem. Soc., Chem. Commun., 1989, 1086 DOI: 10.1039/C39890001086
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