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Tuning Pd-nanoparticle@MIL-101(Cr) Catalysts for Tandem Reductive Amination.
Amanda E Anderson1, Christopher J Baddeley1, Paul A Wright1
1EaStCHEM School of Chemistry, University of St Andrews, Purdie Building, North Haugh, St. Andrews, Fife KY16 9ST UK.
Metal-organic frameworks (MOFs) enable efficient one-pot tandem reductive amination. Tuning the ratio of palladium nanoparticles to Lewis acidic chromium sites in MIL-101(Cr) controls selectivity for secondary amine products.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Metal-organic frameworks (MOFs) offer tunable porosity and Lewis acidity.
- Precious metal nanoparticles supported on MOFs are effective catalysts.
- Reductive amination is a key transformation in organic synthesis.
Purpose of the Study:
- To investigate the use of MIL-101(Cr) loaded with palladium nanoparticles for one-pot tandem reductive amination.
- To explore the influence of the palladium to chromium active site ratio on catalytic selectivity.
- To demonstrate the complementarity of active sites in a tandem catalytic process.
Main Methods:
- Synthesis of palladium nanoparticles supported on MIL-101(Cr).
- Catalytic testing of the composite material in the reductive amination of 4'-fluoroacetophenone with benzylamine under hydrogen pressure.
- Kinetic analysis to understand reaction pathways and selectivity.
Main Results:
- MIL-101(Cr) supported palladium nanoparticles efficiently catalyzed the reductive amination.
- Increasing palladium loading led to hydrogenolysis of the secondary amine product.
- Adjusting the Pd:Cr active site ratio allowed for selective synthesis of the desired secondary amine.
Conclusions:
- The catalytic performance of Pd/MIL-101(Cr) can be tuned by controlling the ratio of active sites.
- This approach offers a versatile strategy for selective synthesis of secondary amines via tandem reductive amination.
- Active site complementarity is crucial for optimizing tandem catalytic reactions.
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