For more than 50 years, the accepted opinion was that the dihydroxylation of olefins with OsO4 proceeded by a concerted mechanism [Eq. (a)]. However, if the influence of the reaction temperature on the enantiomeric excesses in asymmetric dihydroxylations is studied, Eyring plots are obtained with inversion points, which is consistent with a stepwise mechanism.
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Göbel et al. (1993) studied this question.
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