The radical allylation and the hydrogenation of α-(arylsulfinyl)alkyl radicals were examined. In the presence of a bidentate Lewis acid, high diastereoselectivities were achievable in the allylation and the hydrogenation of α-(arylsulfinyl)alkyl radicals derived through the radical β-addition to vinyl sulfoxides bearing the 2-pyridyl, the imidazol-2-yl, or the benzimidazol-2-yl groups.