Herein, we report a comprehensive study of CO hydroboration catalyzed by Mn pincer complexes. The traditional metal-ligand cooperation (MLC) mechanism based on the H-Mn-N-Bpin pincer complex is not viable due to the competing abstraction of the Bpin group from the H-Mn-N-Bpin complex by NaOBu. Instead, we propose an ionic mechanism based on the H-Mn-N-Na species with a low energy span (22.
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