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Title: Heterocyclic betaines. 14. (E)-1-Alkyl-[2-(imidazol-2-ylidene)ethylidene]dihydropyridines with a betaine character. An improved protocol for a Knoevenagel-type condensation for synthesis of (E)-1-alkyl-[2-(1H-imidazol-2-yl)vinyl]pyridinium salts
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Journal of Organic Chemistry [0022-3263] Alcalde, Ermitas yr:1992


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