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- W2029162322 abstract "Durch die Einfuhrung einer Nitrogruppe in den Pyridinring wird die elektrophile Reaktivitat von 2-Chlor-N-methoxypyridinium-Verbindungen stark erhoht. In polaren sowie dipolar aprotischen Losungsmitteln, wie DMF und DMSO, setzen sich die Pyridiniumsalze 2a und 2c bereits bei Raumtemperatur spontan zu den 2-Pyridonen 3a und 3c um. Entsprechende Umsetzungen des 4-Nitroderivates 2b fuhren zu Gemischen von 2- und 4-Pyridonen die Reaktivitat ist verglichen mit 2a und 2c deutlich erniedrigt.Reactions of N-Alkoxycycliminium Salts, X: Stability of 2-Chloro-N-methoxy-nitropyridinium Salts in Polar SolventsNitro substitution of the pyridine ring of 2-chloro-N-methoxypyridinium ions remarkably enhances the electrophilicity of these compounds. In polar and dipolar aprotic solvents, e.g. DMF and DMSO, the pyridinium salts 2a and 2c react spontaneously to yield the 2-pyridones 3a and 3c, even at room temperature. Similar reactions of the 4-nitro isomer 2b yield mixtures of 2- and 4-pyridones but, compared with 2a and 2c, the reactivity is markedly decreased." @default.
- W2029162322 created "2016-06-24" @default.
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- W2029162322 date "1982-01-01" @default.
- W2029162322 modified "2023-09-27" @default.
- W2029162322 title "Reaktionen von N-Alkoxycycliminiumsalzen, 10. Mitt. Zur Stabilität von 2-Chlor-N-methoxy-nitropyridiniumsalzen in polaren Solventien" @default.
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- W2029162322 doi "https://doi.org/10.1002/ardp.19823151003" @default.
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