Variable-temperature ¹H-NMR studies on two C-glycosylflavones.
Molecules
; 17(7): 7914-26, 2012 Jul 02.
Article
em En
| MEDLINE
| ID: mdl-22751258
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.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Prótons
/
Temperatura
/
Espectroscopia de Ressonância Magnética
/
Flavonas
Tipo de estudo:
Prognostic_studies
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article