Collect. Czech. Chem. Commun. 1984, 49, 2790-2800

Stereostructure of slovanolides: X-ray crystallography of the 3-oxo-4αH,8α-benzoyloxy-10β,11α-diacetoxyslovanolide

Urszula Rychłewskaa, Miroslav Holubb, Miloš Buděšínskýb and Zdenka Smítalováb

a Department of Crystallography, Institute of Chemistry, Adam Mickiewicz University, Poznan, Poland
b Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences, 166 10 Prague 6


X-Ray structural analysis of 3-oxo-4αH,8α-benzoyloxy-10β,11α-diacetoxyslovanolide (XII) confirmed the correctness of the previously proposed structure of slovanolides. A comparison of the X-ray and 1H NMR data of lactone XII showed that the confirmation of this substance in crystals and in chloroform or benzene solutions is very similar. The structure of the lactone from Laserpitium marginatum has been corrected to formula XIa.