UV irradiation of 4-hydroxydictyolactone (–)-1 in CDCl3 under N2 leads cleanly to 4-hydroxycrenulide (+)-2, reproducing what probably occurs under solar irradiation of the seaweed Dictyota sp. at low tide along the coasts of Senegal.
G. Guella and F. Pietra, J. Chem. Soc., Chem. Commun., 1993, 1539 DOI: 10.1039/C39930001539
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