G. Guella et F. Pietra, PHOTOCHEMICAL CONVERSION OF XENICANE INTO THE CRENULATANE SKELETON WITH DITERPENOIDS OF THE BROWN SEAWEED DICTYOTA SP FROM THE COASTS OF SENEGAL, Journal of the Chemical Society, Chemical Communications, (20), 1993, pp. 1539-1539
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.