Mustard (1, 2, 2'-dichlorodiethyl sulfide), a liquid vesicant, can be detoxified to the crystalline sulfoxide and sulfone by oxidation, although the sulfone has been reported to still exhibit some vesicant toxicity.'* 2 The sulfur in mustard is believed to be oxidatively less reactive than that in alkyl sulfides because of the presence of two large electron-withdrawing chlorine atoms. However, alkyl sulfides have often been used to simulate the oxidation of m~ stard. ...