Identification of two novel promelacacinidin dimers from Acacia nigrescens.
Two new flavanol-flavonol C(4)(C) to C(5)(D) linked promelacacinidin dimers were isolated from the heartwood of Acacia nigrescens. Their structures were elucidated by extensive (1)H and (13)C NMR spectroscopic studies, and the main conformational features are discussed.
Howell
Hiten
H
Department of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein, 9300 South Africa.
Malan
Elfranco
E
Steenkamp
Jacobus A
JA
Brandt
E Vincent
EV
Brand
Jaco
J
D000045:Acacia / Q000737:chemistry*; D002855:Chromatography, Thin Layer; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D008745:Methylation; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D013019:South Africa; D013237:Stereoisomerism; D014934:Wood
D005419:Flavonoids; C461740:epimesquitol-(4beta-5)-3,3',4',7,8-pentahydroxyflavonone; C461739:mesquitol-(4alpha-5)-3,3',4',7,8-pentahydroxyflavonone