Heterocyclic betaines. Aza analogs of sesquifulvalene. 1. Structural studies of 1-alkyl-4-azolylidene-1, 4-dihydropyridines and azolium azolate inner salts

E Alcalde, I Dinares, J Frigola, C Jaime…

Index: Alcalde, Ermitas; Dinares, Immaculada; Frigola, Jordi; Jaime, Carlos; Fayet, Jean-Pierre; et al. Journal of Organic Chemistry, 1991 , vol. 56, # 13 p. 4223 - 4233

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Citation Number: 31

Abstract

The aza analogs of seequifulvalene may adopt various structures, and of these several 1- alkyl-4-azolylidene-1, 4-dihydropyridmes 8A-8B have been prepared by deprotonation of their corresponding 1-alkyl-4azolylpyridinium dta. These novel structures 8 could show a spectrum of properties ranging from those of ethylenes to betaines. Semiempirical (MNDO//MNDO), experimental dipole moment values (ca 9.05 D),'H and W NMR data, and ...