Not only for ligand exchange at sulfoxides can the sulfoxide/magnesium exchange reaction be used, but it also provides a possibility to generate Grignard reagents in way that avoids metallic magnesium and thus radical processes. Therefore, enantiomerically pure Grignard reagents can be obtained from the corresponding sulfoxides [Eq. (a)].
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Hoffmann et al. (1999) studied this question.