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The preparation of quaternary pyridinium salts with amidoxime group in 2-, 3-and 4-position is described. The isomer with the substituent in 3-position rearranges on addition of base to a 1-hydroxy-2-imino-3-pyridinecarbaldimine. The reaction of 3-cyano-pyridinium salts with hydroxylamine and potassium tert-butoxide gives derivatives of dipyrido[1,2-a: 3′,4′-c]pyrrole

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Untersuchungen an quartären Pyridinium-Salzen, XI [1].  Reaktionen von Cyanpyridinium-Salzen mit Hydroxylamin /  Investigations of Quaternary Pyridinium Salts, XI [1].  Reactions of Cyanopyridinium Salts with Hydroxylamine