Acacia galpinii

Malan, E. and Sireeparsad, A., The structure and synthesis of the first dimeric proteracacinidins from Acacia galpinii, Phytochemistry, 38, 237, 1995. 

Bennie, L. et al.. Oligomeric flavanoids. Part 34. Doubly-linked proteracacinidin analogues from Acacia caffra n6. Acacia galpinii, Tetrahedron, 57, 661, 2001. 

Bennie, L. et al., (4 —> 6)-Coupled proteracacinidins and promelacacinidins from Acacia galpinii and Acacia caffra. Phytochemistry, 60, 521, 2002. 

The co-occurrence of the ether-linked proteracacinidins (39)-(42) as well as the conventional carbon coupled analogues in Acacia galpinii (44) presumably reflects the poor nucleophilicity of the pyrogallol A-ring of the monomeric flavan-3,4-diol precursors thus permitting alternative centres to participate in interflavanyl bond forming processes. 

The natural occurrence of promelacacinidins was until recently restricted to the heartwoods of Prosopis glandulosa and Acacia melanoxylon. The investigations of the heartwood constituents of A. caffra and A. galpinii also revealed the presence of a limited number of promelacacinidins (Table 11.11) as well as mixed di- and trimeric proteracacinidin or promelacacinidins (see Table 11.10). 

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