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- W1984004592 abstract "Dihydro-1,2-oxazine 8 und 1,2-Oxazine 12 werden aus Nitronsäuren der Addukte aus α-Nitroolefinen und β-Dicarbonylverbindungen (6) auf zwei Wegen hergestellt: A) Die Nitronsäuren 6 werden in einer siedenden Lösung von Harnstoff in Ethanol oder Methanol erhitzt. B) Die Nitronsäuren 6 werden mit einer wäßrigen Ammoniumchlorid/Natriumsulfid-Lösung reduziert. 1H-NMR- und 13C-NMR-Untersuchungen beweisen die Konstitutionen. Der Mechanismus wird diskutiert. Dihydro-1,2-oxazines 8 and 12-oxazines 12 are formed by the reaction of the nitronic acids of the adducts of α-nitroolefins and β-dicarbonyl compounds (6) by two ways: A) The nitronic acids 6 are heated in a boiling solution of urea in ethanol or methanol. B) The nitronic acids 6 are reduced with an aqueous solution of ammoniachloride and sodium sulfide. 1H-nmr and 13C-nmr investigations prove the constitutions. The mechanism is discussed." @default.
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- W1984004592 date "1986-05-01" @default.
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- W1984004592 title "Heterocyclen aus α-nitroolefinen. XI . 1,2-oxazine aus α-nitroolefinen und β-dicarbonylverbindungen" @default.
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- W1984004592 doi "https://doi.org/10.1002/jhet.5570230322" @default.
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