Abstract
An investigation of the solid-state conformational properties of 3-methylsulphinyl derivatives of furan and 2- and 3-methylsulphinyl derivatives of thiophene, which also contain halogen atoms in the heterocyclic ring, is reported. For 3-iodo-2-(methylsulphinyl)thiophene compound 1, two crystallographically independent molecules were found in the unit cell, and in 2-bromo-4-iodo-3- (methylsulphinyl)thiophene, compound 5, a high degree of disorder is present. The sulphur atom of the methylsulphinyl group has a pyramidal structure. The methyl group is highly twisted with respect to the ring plane and the SO bond adopts different orientations in the molecules exam- ined. When only one halogen atom is present in the ring the SO bond is directed to the opposite side of the ring with respect to this atom, yet the relative position of the substituents determines a different twist of this bond with respect to the heterocyclic plane.
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