oxidized forms of 1,3-dithietane are well known, although they are often not prepared from the dithietane. examples include the so-called zwiebelanes (2,3-dimethyl-5,6-dithiabicyclo[2.1.1]hexane "s"-oxides) from onion volatiles and 1,3-dithietane 1,1,3,3-tetraoxide, the so-called sulfene dimer.