ChemInform Abstract: REACTIONS OF 2′‐HYDROXY‐4′‐METHOXYDIBENZOYLMETHANE AND ALPHA‐BROMO‐2′‐HYDROXY‐5′‐METHYL‐4‐METHOXYDIBENZOYLMETHANE WITH 2,4‐DINITROPHENYLHYDRAZINE
Abstract:Während sich das Dibenzoylmethan (Ia) mit dem Phenylhydrazin (II) in saurem Medium zu dem Pyrazol (III) cyclisiert, liefert das Brom‐Analoge (Ib) unter den gleichen Bedingungen das Flavon (IV), das beim Erhitzen mit Alkali′ in das Cumaran pyrazol (V) übergeht.
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