The new organosulphur π-donor, 1,2-bis(thioxanthen-9-ylidene)ethene (4), which has high molecular symmetry, D2h, a minimized Coulombic repulsion of electrons in the doubly ionized state, and a planar cross-conjugated π-system, has been synthesized by a two-step sequence in an overall yield of 70%.
K. Nakasuji, K. Takatoh, M. Nakatsuka and I. Murata, J. Chem. Soc., Chem. Commun., 1981, 717 DOI: 10.1039/C39810000717
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