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

Abstract

<jats:p>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</jats:p>