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- W2028743048 abstract "Die heterocyclischen 1,3-Dicarbonylverbindungen 2b, 2d, 6c und 9b lassen sich mit Polyphosphorsäure (PPS) zu den Chromonen 3a, 3b, 7 und 10 cyclisieren. Die 1,3-Dicarbonylverbindungen 2, 6, 9 und 11 sind vollständig enolisiert; die Enolisierungsrichtung und H-Brückenbindung wird diskutiert. Das Dibenzoylmethan-Derivat 5c liegt als chelatisiertes Diketon vor. Die Strukturbeweise werden mit spektroskopischen Methoden geführt. Anellated Chromones from Heterocyclic 1,3-Dicarbonyl Compounds The heterocyclic 1,3-dicarbonyl compounds 2b, 2d, 6c and 9b cyclize with polyphosphoric acid (PPA), forming the chromones 3a, 3b, 7 and 10. The dicarbonyl compounds 2,6,9 and 11 are completely enolised; direction of enolisation and hydrogen bonding are discussed. The dibenzoylmethane derivative 5c represents a chelated diketone. Structures are elucidated by spectroscopic methods." @default.
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- W2028743048 date "1974-01-01" @default.
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- W2028743048 title "Anellierte Chromone aus heterocyclischen 1,3-Dicarbonylverbindungen" @default.
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- W2028743048 doi "https://doi.org/10.1002/ardp.19743070706" @default.
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