In recent years, many applications of SO2 and its surrogates in organic synthesis have been reported. Due to high polarity and Lewis acid properties sulfur dioxide can be used as strongly ionizing solvent. Furthermore, it has a high dipole moment (1.61 D), therefore it readily dissolves both organic and inorganic compounds. On the other hand, SO2 has been reported as a reaction medium for processes involving carbenium ions. Surprisingly, despite all these facts sulfur dioxide has not entered the “classic toolbox” of synthetic organic chemist as an everyday-solvent. This has prompted us to search for organic reactions that would profit from their running in liquid SO2 as a reaction medium.