Summary.
Using 2D ROESY 1H NMR spectroscopy it could be unequivocally shown from nuclear Overhauser effects and intramolecular exchange correlations of strategic signals that hypericin as well as its 3-hypericinate ion are present as the tautomers with the carbonyl groups located in positions 7 and 14 in polar solvents like dimethylsulfoxide. In apolar solvents like tetrahydrofuran hypericin prevails as the 1,6-dioxo tautomer.
Zusammenfassung.
Mit Hilfe der 2D-ROESY-1H-NMR-Spektroskopie konnte über Kern-Overhauser-Effekte und Austauschkorrelationen strategischer Signale zweifelsfrei nachgewiesen werden, daß Hypericin und sein 3-Hypericination in polaren Lösungsmitteln wie Dimethylsulfoxid als Tautomere mit den Carbonylgruppen in Positionen 7 und 14 vorliegen. In unpolaren Lösungsmitteln wie Tetrahydrofuran dominiert das 1,6-Tautomere.
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Received February 4, 1999. Accepted March 1, 1999
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Dax, T., Falk, H. & Kapinus, E. A Structural Proof for the Hypericin 1,6-Dioxo Tautomer. Monatshefte fuer Chemie 130, 827–831 (1999). https://doi.org/10.1007/PL00010264
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DOI: https://doi.org/10.1007/PL00010264