Liquid sulfur dioxide as a solvent and/or reagent was applied in the following research directions: A - nucleophilic ring opening reactions of aziridines and azetidines facilitated by the ability of SO2 to equally solvate ionic type as well as polar covalent compounds; B - formation of glycosidic bond facilitated by Lewis acidic, fluorophilic and carbenium ion stabilizing properties of SO2; C – sulfone synthesis using bora-ene reaction as a key step, because SO2 is a useful building block for introduction of sulfonyl group.