Molecules 2012, 17(7), 7914-7926; doi:10.3390/molecules17077914
Article

Variable-Temperature 1H-NMR Studies on Two C-Glycosylflavones

1email, 1email, 1,* email and 2,* email
Received: 5 April 2012; in revised form: 26 May 2012 / Accepted: 18 June 2012 / Published: 2 July 2012
(This article belongs to the Section Natural Products)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Two known C-glycosylflavones, swertisin and embinoidin, were isolated from the leaves of Anthurium aripoense, and characterized by room temperature 1D and 2D NMR experiments. At this temperature, the 1H- and 13C-NMR spectra of these C-glycosylflavones revealed doubling of signals, which suggested the presence of two rotamers in solution. Variable-temperature (VT) 1H-NMR studies supported this hypothesis. The T-ROESY data, in addition to the theoretical (MM2) calculations utilizing the Chem3D Pro software, confirmed the hypothesis that the two rotamers interchange via rotation about the C-glycosidic bond.
Keywords: variable-temperature 1H-NMR; C-glycosylflavones; rotamers; swertisin; embinoidin; Anthurium aripoense
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MDPI and ACS Style

Frank, J.H.; Powder-George, Y.L.; Ramsewak, R.S.; Reynolds, W.F. Variable-Temperature 1H-NMR Studies on Two C-Glycosylflavones. Molecules 2012, 17, 7914-7926.

AMA Style

Frank JH, Powder-George YL, Ramsewak RS, Reynolds WF. Variable-Temperature 1H-NMR Studies on Two C-Glycosylflavones. Molecules. 2012; 17(7):7914-7926.

Chicago/Turabian Style

Frank, Julia H.; Powder-George, Yomica L.; Ramsewak, Russel S.; Reynolds, William F. 2012. "Variable-Temperature 1H-NMR Studies on Two C-Glycosylflavones." Molecules 17, no. 7: 7914-7926.

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