Journal
MAGNETIC RESONANCE IN CHEMISTRY
Volume 45, Issue 5, Pages 434-438Publisher
WILEY
DOI: 10.1002/mrc.1974
Keywords
NMR; H-1 NMR; C-13 NMR; 2D NMR; anthraquinone; xanthone; secondary metabolites; variable temperature; structure elucidation
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We report the unambiguous assignments of the H-1 and C-13 NMR spectra of one new natural product, namely, 6,8-di-O-methyl versiconol (1) together with one known anthraquinone aversin (2) and two xanthones 5-methoxysterigmatocystin (3) and sterigmatocystin (4). These compounds were all isolated from the mangrove endophytic fungus ZSUH-36 from the South China Sea. 1D and 2D NMR experiments including COSY, HMQC and HMBC were used to elucidate the structures. Variations in the 1H NMR spectrum of 6,8-di-O-methyl versiconol (1) were also observed in the temperature range 25-75 degrees C. In addition, the plausible biogenetic path from 1 to 2 is discussed. Copyright (c) 2007 John Wiley & Sons, Ltd.
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