1,3-dithietanes, where the sulfur atoms are non-adjacent. 1,3-dithietane itself, a colorless, easily sublimed, crystalline, unpleasant-smelling solid with mp 105-106 °c, was first prepared in 1976 by reaction of bis(chloromethyl) sulfoxide with sodium sulfide followed by thf-borane reduction of the first formed 1,3-dithietane 1-oxide, as shown in the scheme below. carbon-substituted 1,3-dithietanes are well known, with the first examples being described as early as 1872. examples include 2,2,4,4-tetrachloro-1,3-dithietane, the photochemically-formed dimer of thiophosgene, and tetrakis(trifluoromethyl)-1,3-dithietane, [(cf)cs].