Vinylogs of Tetrathiafulvalene (TTF) Bearing four 1,4-Dithiafulven-6-yl Substituents : Novel Highly Extended and Sulfur-rich ?-Donors

Article abstract of DOI:10.1016/S0040-4039(00)60601-9

The title compounds 1 were synthesized from the mono-diEt-acetal of acetylenedicarbaldehyde and 2-thioxo-1,3-dithioles through three key steps: cyloaddition, dimerization-desulphurization of the resulting thials, and after deketalization, fourfold Wittig olefination of the tetraformyl TTF-vinylogs 4 with the P-ylids Wα-γ bearing the 1,3-dithiol-2-ylidene moiety.Cyclic voltammetry shows that these compounds are very strong ?-donors and good precursors of conducting cation-radical salts.