Dithietane
![Structure of a 1,2-dithietane and 1,3-dithietane, where R is an organic group](/Images/godic/202501/09/Dithetane2352.png")
![Left: thiophosgene dimer, 2,2,4,4-tetrachloro-1,3-dithietane; center: a zwiebelane, in onion volatiles; right: sulfene dimer](/Images/godic/202501/09/1,3-Dithietanes.svg2352.png")
Dithietanes are saturated heterocyclic compounds that contain two divalent sulfur atoms and two sp-hybridized carbon centers. Two isomers are possible for this class of organosulfur compounds:
A stable 1,2-dithietane derivative is trans-3,4-diethyl-1,2-dithietane 1,1-dioxide, formed by the spontaneous dimerization of the lachrymatory agent syn-propanethial-S-oxide, found in onion.