An unusual result of the reaction of α-acetylene aldehydes, pyridines, and malonic acid. Synthesis and structure of novel pyridine betaines von Golovanov, Aleksander А., Dan’kov, Sergei А., Sokov, Sergey А., Melnikov, Pavel А., Ukolov, Anton I., Voronova, Evgeniya D., Vologzhanina, Anna V., Bunev, Aleksander S.

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