The original Fig. 6 presented incorrect thermodynamic data for the conversion 4c + KOtBu → 2 + KOMe. A revised Fig. 6 is now provided. These changes do not affect the article text and its conclusions.

The reaction mechanism of ester hydrogenation catalyzed by a bidentate aminophosphine ligated manganese catalyst was studied by DFT calculations. Particular emphasize was placed on the role of the alkoxide base additives. The presence of such basic promoters as KO^tBu can improve the catalyst activity by lowering the activation barriers of H₂ dissociation as well as the hydrogenation step. The promoting effect of KO^tBu on H₂ activation is much stronger than that of tert-butoxides with other alkali metals, which is crucial for the catalyst regeneration from the deactivated Mn-alkoxide species in the resting state.