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Ferreira, Daneel; Marais, Jannie P.J.; Slade, Desmond
Phytochemistry, 09/2005, Letnik: 66, Številka: 18Journal Article, Conference Proceeding
The structures of pro-/leuco-anthocyanidins with bonding positions other than those linking flavan-3-ol moieties with resorcinol- and/or phloroglucinol-type A-rings are discussed. The proanthocyanidin pool in the floral kingdom usually involves the presence of carbon–carbon bonds linking predominantly flavan-3-ol constituent moieties. Such an ensemble of flavan-3-ol units originates via electrophilic aromatic substitution of flavan-4-yl carbocations (or their equivalents) derived from flavan-4-ols and/or flavan-3,4-diols and the nucleophilic centers of the m-oxygenated A-rings of flavan-3-ol nucleophiles. In the absence of these potent flavan-3-ol nucleophiles with their aptitude for the formation of carbon–carbon bonds, alternative centers emerge as participants in interflavanyl bond formation. Such a phenomenon is demonstrated for the distribution of various profisetinidin-, prorobinetinidin-, proguibourtinidin-, promelacacinidin- and proteracacinidin-type pro- and leuco-anthocyanidins in several southern hemisphere heartwood species.
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