The preparation of the sulfoxides and the sulfones of two centrally active alkylthioamphetamine salts, (+/-)-1-(4-methylthiophenyl)-2-aminopropane hydrochloride (2) (MTA . HCl) and (+/-)-1-(2,5-dimethoxy-4-ethylthiophenyl)-2-aminopropane hydrochloride (7) (ALEPH-2 . HCl), is described.