text: A sulfur-based main group analog of a carbyne complex has been prepared by Seppalt and coworkers.  The compound, trifluoro(2,2,2-trifluoroethylidyne)-λ-sulfurane, FC–C≡SF, prepared by dehydrofluorination of FC–CH=SF or FC–CH–SF, is an unstable gas that readily undergoes dimerization to form trans-(CF)(SF)C=C(CF)(SF) at above –50 °C.