1.Addition of sulfenyl chlorides to N-allylphthalimide affords only the thermodynamically stable isomers, N-[3-chloro-2-(alkylthio)propyl]phthalimides.2.Oxidation of N-[3-chloro-2-(alkylthio)propyl]phthalimides gives N-[3-chloro-2-(alkylsulfonyl)-propyl]phthalimides and N-[3-chloro-2-(alkylsulfinyl)propyl]phthalimides.3.Fission of N-(2,3-epoxypropyl)phthalimide by thiols, and 2,3-epoxypropylthioethers with phthalimide affords N-[2-hydroxy-3-(alkylthio)propyl]phthalimides, from which were obtained the isomeric N-[2-chloro-3-(alkylsulfonyl)propyl]phthalimides.4.Dephthalylation of N-[3-chloro-2-(alkylsulfonyl)propyl]phthalimides gave the 3-chloro-2-(alkyl-sulfonyl)propylamine hydrobromides.