2-Chloroethyl phenyl sulfide has been reported as sulfur mustard simulant. It is a chemical-warfare agent (CWA) simulant and its oxidation using hydrothane films has been reported. It is also reported as a simulant for the chemical warfare agent mustard [bis(2-chloroethyl) sulfide]. Its reaction with vesicular functionalized double-chain surfactant (potassium O, O′-didodecylphosphorodithioate) at pH 9.0 borate buffer affords [S-[(2-phenylthio)ethyl]O,O′-didodecylphosphorodithioate]. Its oxidation with H2O2 catalyzed by [MnL](ClO4)2 (L = N,N′,N″-tris(2-hydroxypropyl)-1,4,7-triazacyclononane) afforded 2-chloroethyl phenyl sulfone and phenyl vinyl sulfone.2-Chloroethyl phenyl sulfide, a sulfur mustard agent stimulant, may be used as target analyte in a bioassay for the detection of mustard agent. 2-Chloroethyl phenyl sulfide has been reported as sulfur mustard simulant. It is a chemical-warfare agent (CWA) simulant and its oxidation using hydrothane films has been reported. It is also reported as a simulant for the chemical warfare agent mustard [bis(2-chloroethyl) sulfide]. Its reaction with vesicular functionalized double-chain surfactant (potassium O, O′-didodecylphosphorodithioate) at pH 9.0 borate buffer affords [S-[(2-phenylthio)ethyl]O,O′-didodecylphosphorodithioate]. Its oxidation with H2O2 catalyzed by [MnL](ClO4)2 (L = N,N′,N″-tris(2-hydroxypropyl)-1,4,7-triazacyclononane) afforded 2-chloroethyl phenyl sulfone and phenyl vinyl sulfone.