Conformational stability of diastereomeric 8,8-dichloro-3,5-dioxa-4-thia-4-oxobicyclo[5.1.0]octanes: X-ray crystallography, dynamic 1H and 13C NMR spectroscopy study

X-ray data for both title molecules display a chair conformation with exo location of cyclopropane moiety and axial or equatorial sulfinyl group. Dynamic 1H and 13C NMR spectroscopy at −95 °С exhibit conformational homogeneity for the first diastereomer and two component chair - twist-boat equilibrium (2:3) for the latter.