Synthesis of α-aminonitriles catalyzed by montmorillonite K10 in the presence of dicationic phosphonium salt in water under ultrasonic effect Ç igdem YILDIRIM, Ç igdem YOLAÇ AN, Feray AYDOGAN

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Authors' Contribution GA conceived and designed the study and wrote the manuscript. AM did experimental work. AG analysed the data. SF and LD edited the manuscript. SSAA assisted in brooder collection.

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The crystal structure of the title compound, 5,3′‐di­hydroxy‐6,7,4′‐tri­methoxy­flavone, C18H16O7, isolated from Ballota limbata Linn., contains discrete mol­ecules with normal molecular dimensions. The structure is stabilized by intramolecular and intermolecular hydrogen bonds between hydroxyl H atoms and carbonyl O atoms, with O⋯O interactions of 2.594 (2) and 2.673 (2) Å. The flavone moiety is essentially planar with methoxy methyl groups lying 0.169 (3)–0.851 (2) Å out of the plane.

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