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Entropic intermediates and hidden rate-limiting steps in seemingly concerted cycloadditions. Observation, prediction, and origin of an isotope effect on recrossing.
Stereoselectivities of histidine-catalyzed asymmetric aldol additions and contrasts with proline catalysis: a quantum mechanical analysis.
Aromatic transition States in nonpericyclic reactions: anionic 5-endo cyclizations are aborted sigmatropic shifts.