In my work, I was investigating reactions that take place on halogenated organic compounds. I focused on the reactions of the nucleophilic substitution by potassium ethyl xanthate. I synthesized the halogenated derivatives by reducing ketones and aldehydes into alcohols, and further by chlorination of alcohols with SOCl2. On the products thus obtained, I performed a nucleophilic substitution by potassium ethyl xanthate. The yields of the reactions were high. The products were isolated by extraction, filtration and distillation. For the characterization of the products, I used the 1H NMR spectra recorded in the CDCl3 at 300 or 500 MHz.