Fig. 6: Theoretical analysis on origin of stereoselectivity.
From: Desymmetrization of N-Cbz glutarimides through N-heterocyclic carbene organocatalysis

Optmized structures of transition states TS2R (a) and TS2S (b), NCI analyses for transition states TS2R (c) and TS2S (d), and AIM analyses for transition states TS2R (e) and TS2S (f) (unit: Å).