Deracemization, the conversion of a racemic mixture into an enantiomerically enriched material, is achieved with the retro-aldol reaction of rac-1 in the presence of lithium (-)-ephedrinate [Eq. (1)]. Remarkably, two stereogenic centers are simultaneously deracemized. This reaction shows that efficient thermodynamic control of the enantioselectivity of aldol reactions is possible.
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