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• W4366206487 endingPage "9175" @default.
• W4366206487 startingPage "9164" @default.
• W4366206487 abstract "Utilization of main-group metals as alternatives to transition metals in homogeneous catalysis has become a hot research area in recent years. However, their application in catalytic hydrogenation is less common due to the difficulty in heterolytic cleavage of the H–H bond. Employing aromatization/de-aromatization metal–ligand cooperation (MLC) highly enhances the H2 activation process, offering an efficient approach for the hydrogenation of unsaturated molecules catalyzed by main-group metals. Herein, we report a series of new magnesium pincer complexes prepared using PNNH-type pincer ligands. The complexes were characterized by NMR and X-ray single-crystal diffraction. Reversible activation of H2 and N–H bonds by MLC employing these pincer complexes was developed. Using the new magnesium complexes, homogeneously catalyzed hydrogenation of aldimines and ketimines was achieved, affording secondary amines in excellent yields. Control experiments and DFT studies reveal that a pathway involving MLC is favorable for the hydrogenation reactions. Moreover, the efficient catalysis was extended to the selective hydrogenation of quinolines and other N-heteroarenes, presenting the first example of hydrogenation of N-heteroarenes homogeneously catalyzed by early main-group metal complexes. This study provides a new strategy for hydrogenation of C═N bonds catalyzed by magnesium compounds and enriches the research of main-group metal catalysis." @default.
• W4366206487 created "2023-04-19" @default.
• W4366206487 creator A5007806208 @default.
• W4366206487 creator A5012708428 @default.
• W4366206487 creator A5081692819 @default.
• W4366206487 creator A5086773368 @default.
• W4366206487 date "2023-04-17" @default.
• W4366206487 modified "2023-09-25" @default.
• W4366206487 title "Designing New Magnesium Pincer Complexes for Catalytic Hydrogenation of Imines and <i>N</i>-Heteroarenes: H₂ and N–H Activation by Metal–Ligand Cooperation as Key Steps" @default.
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