- Ent-Eudesmane sesquiterpenoids, galloyl esters of the oak lactone precursor, and a 3-O-methylellagic acid glycoside from the wood of Platycarya strobilacea
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ent-Eudesmane sesquiterpenoids, 8,11-dihydroxy-2,4-cycloeudesmane, 11-hydroxy-2,4-cycloeudesman-8-one and 2,4-cyclo-7(11)-eudesmen-8-one, were isolated from the wood of Platycarya strobilacea, which has been used as an aromatic tree since at least the 18th century. On charring the wood, 2,4-cyclo-7(11)-eudesmen-8-one was detected in the smoke. In the charred wood, the concentrations of ellagitannins, such as galloyl pedunculagin, dramatically decreased, whereas concentrations of pentagalloyl glucose, and other gallotannins were relatively stable. In addition, two other compounds, the 6′-O-m- and p-digalloyl oak lactone precursor and the 3-O-methylellagic acid 4′-O-(4″-O-galloyl)-xylopyranoside, were isolated from the charred wood along with m- and p-digallic acid.
- Maeda, Hajime,Kakoki, Narumi,Ayabe, Mami,Koga, Yuki,Oribe, Tomoko,Matsuo, Yosuke,Tanaka, Takashi,Kouno, Isao
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experimental part
p. 796 - 803
(2011/11/06)
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- DIGALLIC ACID
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Digallic acid was prepared by partial acid hydrolysis of tannic acid and purified by Counter Current Distribution.In water and methanol solution digallic acid is present in two isomeric equilibrium forms which were named meta and para digallic acid.Meta digallic acid, the main component, is stable in ether and acetone solution.The above was proved by HPLC, GC-MS and NMR experiments on digallic acid and on its permethylation product.
- Verzele, M.,Delahaye, P.,Dijck, J. Van
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p. 181 - 186
(2007/10/02)
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