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The title compounds 4 and 5 were prepared by reaction of 1,4-dimethoxy-2,5-bis(3,4-dimethoxyphenylthio) benzene (8) with sulfur dichloride and selenium dioxide, resp., and characterized by  1 H NMR and MS spectra. An X-ray analysis of 4 shows the compound to have a chair form, i.e. each of its two thianthrene units are folded at their SS axes in such a way that the two peripheral rings are found at different sites of the central ring plane (angles of fold 130.5°). The methoxy groups of the peripheral rings are coplanar, those of the central ring perpendicular to the corresponding ring planes. Bond distances and angles of 4 are in the normal range (CS 177.5 pm, CSC 100.2°).

zeitschrift für naturforschung b

Elementorganische Verbindungen mit o-Phenylenresten, XV [1]. Hexamethoxy-tetrachalcogena-tetrahydropentacene / Organometallic Compounds with o-Phenylene Substituents, Part XV [1]. Hexamethoxy-tetrachaleogena-tetrahydropentacenes