The title compounds 2 obtainable from the dihydrodiphosphetes 1 are analogues of the tetrathiafulvalenes, which are of interest as components of organic metals and superconductors. An X-ray structure analysis of the tetrasulfide of 2, R = Et, revealed a planar five-membered ring with a dihedral angle of 4.22° and completely localized CC double bonds (R = Me, Et, Ph).
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Maigrot et al. (1988) studied this question.
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