2'-(1,3-Dithiolan-2-ylidene)-4'-(1,3-dithiol-2-ylidene)spiro[1,3-dithiole-2,5'-(4'H-5',6'-dihydro-1',3'-dithiapentalene)], the Self-Condensation Product of an Extended Tetrathiafulvalene Derivative

Silica-gel treatment of the extended tetrathiafulvalene derivative, 2,3-bis(1,4-dithiafulven-6-yl)-6,7-dihydrotetrathiafulvalene, bearing two 1,4-dithiafulven-6-yl groups in vicinal positions, afforded the title compound, C₁₄H₁₀S₈, as a cyclization product. While one dithiafulvenyl group is still conjugated with the tetrathiafulvalene moiety, the other one gives rise to a strongly folded 1,3-dithiole group linked to the molecule through a spiro-C atom. Two short non-bonding intramolecular 1,5-S...S contacts are also identified in the title compound.

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