Abstract: The synthesis of 2, 3-diphenylthiirene I-oxide (7) by treatment of (i)-a, a'- dibromodibenzyl sulfoxide (5) with tri-ethylamine in methylene dichloride solution is described. The sulfoxide 5 was obtained by careful oxidation of the free radical bromination product of dibenzyl sulfide,(f)-a, a'-dibromodibenzyl sulfide (4), by means of m- chloroperbenzoic acid. The structure of 7 was established by oxidation to the ...