Structural determination of oleanane-28,13b-olide and taraxerane-28,14b-olide fluorolactonization products from the reaction of oleanolic acid with SelectfluorTM A. Eadsforth, Megan Kong, Linghan Whitehead, George F. S. Vitorica-Yrezabal, Iñigo Javier T. O’Keefe, Raymond A. Bryce, Richard C. Whitehead, Roger crystal structure oleanolic acid fluoro­lactone The X-ray crystal structure data of 12-α-fluoro-3β-hy­droxy­olean-28,13β-olide methanol hemisolvate, 2C30H47FO3·CH3OH, (1), and 12-α-fluoro-3β-hy­droxy­taraxer-28,14β-olide methanol hemisolvate, 2C30H47FO3·CH3OH, (2), are described. The fluoro­lactonization of oleanolic acid using SelectfluorTM yielded a mixture of the six-membered δ-lactone (1) and the unusual seven-membered γ-lactone (2) following a 1,2-shift of methyl C-27 from C-14 to C-13. 2024-11-05T07:41:33Z 2024-11-05T07:41:33Z 2024-08 journal article A. Eadsforth, M. et. al. Acta Cryst. (2024). E80, 857–862. [https://doi.org/10.1107/S2056989024006480] https://hdl.handle.net/10481/96624 10.1107/S2056989024006480 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional International Union of Crystallography