title: An unusual C6-C6" linked flavonoid from Miconia cabucu (Melastomataceae).
abstract: Chromatographic fractionation of the methanolic extract from the leaves of Miconia cabucu Hoehne (Melastomataceae) afforded the first example of a C(6)-C(6") linked flavone dimer, 5-hydroxy-4',7-dimethoxyflavone-(6-C-6'')-5''-hydroxy-3''',4''',7''-trimethoxyflavone as well as the known compounds, quercetin-3-O-alpha-l-rhamnopyranosyl-(2-->1)-O-beta-D-xylopyranoside, quercetin-3-O-alpha-l-rhamnopyranoside, myricetin-3-O-alpha-l-rhamnopyranoside, quercetin-3-O-beta-D-glucopyranoside, kaempferol-3-O-beta-D-(6''-coumaroyl)-glucopyranoside and gallic acid. Their chemical identities were established by application of NMR spectroscopic methods including 2D-NMR, as well as UV and ESI-MS analyses.
authors.affiliation: Instituto de Química, Universidade Estadual Paulista, UNESP, C.P. 355, 14801-97, Araraquara, São Paulo, Brazil.
authors.forename: Juliana
authors.initials: J
authors.lastname: Rodrigues
authors.forename: Daniel
authors.initials: D
authors.lastname: Rinaldo
authors.forename: Lourdes Campaner
authors.initials: LC
authors.lastname: dos Santos
authors.forename: Wagner
authors.initials: W
authors.lastname: Vilegas
mesh_terms: D002851:Chromatography, High Pressure Liquid; D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification; D005707:Gallic Acid / Q000737:chemistry / Q000302:isolation & purification; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification; D035322:Melastomataceae / Q000737:chemistry*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular
chemical_list: C523837:5-hydroxy-4',7-dimethoxyflavone-(6-C-6')-5'-hydroxy-3',4',7'-trimethoxyflavone; D005419:Flavonoids; D006027:Glycosides; D005707:Gallic Acid