Collect. Czech. Chem. Commun. 1985, 50, 2245-2251

Dipole moments and conformation of α-disulphones. The gauche effect

Otto Exnera and Václav Jehličkab

a Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences, 166 10 Prague 6
b Department of Physical Chemistry, Prague Institute of Chemical Technology, 166 28 Prague 6


The dipole moments of substituted diphenyl disulphones I-III were measured in benzene solution and interpreted by the previously described graphical method. The results suggest an equilibrium of the ap and sc conformations in the ratio 3 : 1, at variance with various empirical rules and theories of the so-called gauche effect. A statistical treatment of X-ray data of various sulphonyl derivatives revealed essentially two preferred conformations: the more stable sc, with a broadened dihedral angle, and the less stable ap.