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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
Published on: October 18, 2019
Hexacoordinated tin complexes catalyse imine hydrogenation with H2
Andrea Žáková1, Pritha Saha1, Alexandros Paparakis1
1Department of Inorganic Chemistry, Faculty of Science Charles, University Prague, 128 00, Czech Republic. martin.hulla@natur.cuni.cz.
Hexacoordinated tin complexes with Schiff base ligands catalyze imine hydrogenation via hydrogen activation. This expands frustrated Lewis pair (FLP) catalysis by utilizing main-group elements for tunable reactivity.
Area of Science:
- Organometallic Chemistry
- Catalysis
- Main-group Chemistry
Background:
- Frustrated Lewis pair (FLP) catalysts typically use limited Lewis acids (LA), restricting property tuning.
- Main-group complexes offer diverse ligand options for broader FLP catalysis.
Purpose of the Study:
- To investigate hexacoordinated tin complexes as novel FLP hydrogenation catalysts.
- To explore the potential of main-group elements in FLP catalysis.
Main Methods:
- Synthesis of hexacoordinated tin complexes with Schiff base ligands.
- Hydrogen-deuterium scrambling experiments to assess H2 activation.
- Imine hydrogenation reactions to evaluate catalytic efficiency.
Main Results:
- [Sn(tBu2Salen)(OTf)2] activated H2 at 25 °C and 10 bar.
- [Sn(Salen)Cl2] demonstrated the highest efficiency in imine hydrogenation.
- Various imines were hydrogenated with yields up to 98%.
Conclusions:
- Hexacoordinated tin complexes effectively catalyze imine hydrogenation via H2 activation.
- Ligand tuning is crucial for optimizing FLP catalyst performance.
- Main-group element-based FLP catalysts offer promising avenues for hydrogenation reactions.
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