The reaction of 5,6-dithiabicyclo[2.1.1]hexane derivatives with OXONE in a two-phase mixture of dichloromethane and water gave the corresponding dithiirane derivatives which were stable in solution. The formation of the dithiiranes were proved by UV-Vis spectra and chemical transformations. The reaction of 7,8-dithiabicyclo[4.1.1]octane derivatives with OXONE gave the corresponding cis-dithiirane oxides. The reaction of the head-to-tail dimer of 2-adamantanethione with OXONE gave 2-adamantanone as the sole detectable material.
Oxidation of 2,2,3,3-Tetramethyl-1,4-diphenyl-5,6-dithiabicyclo[2.1.1]hexane and Its Oxidation Products: An Important Role of 1,3-Transannular Interaction in the 1,3-Dithietane Part
and endo, endo-5c), and an S,S,S′-trioxide (6). The relative reactivity to further oxidation is 4b >> 4a and 5b > 5a, which suggests that the attractive 1,3-transannular interaction operative in 1,3-dithietane part of 4a and 5a decreases the reactivity of 4a and 5a. 4b isomerizes to 4a on standing over silica gel at room temperature and also 5b is converted to 5a on heating. Heating 6 in refluxing toluene