Photochemistry and Photobiology, August 1st, 2001
The Structure of Hypericin in Solution. Searching for Hypericin's 1,6 Tautomer(para)
ABSTRACT
Hypericin in organic solvents displays two types of electronic spectra: one type which shows a distinct solvatochromic effect, the stable form, and the other, the unstable form, which lacks this property. The latter type is formed in dry nonprotic solvents (e.g. tetrahydrofuran, EtOAc) and can be converted to the stable form on addition of erotic solvents. In order to establish the tautomeric structure of the unstable form we applied conventional nuclear magnetic resonance techniques as well as two-...
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