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A Supramolecular Palladium Catalyst Displaying Substrate Selectivity by Remote Control.

Paolo Zardi1, Thierry Roisnel1, Rafael Gramage-Doria1

  • 1Univ Rennes, CNRS, ISCR-UMR 6226, F-35000, Rennes, France.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 5, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces enzyme-inspired metalloporphyrin supramolecular ligands for homogeneous catalysis. These ligands exhibit substrate selectivity in palladium-catalyzed reactions by accommodating substrates within the porphyrin pocket.

Keywords:
cross-couplinghomogeneous catalysispalladiumporphyrinoidssupramolecular chemistry

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Area of Science:

  • Supramolecular chemistry
  • Homogeneous catalysis
  • Organometallic chemistry

Background:

  • Metalloporphyrins are inspired by enzymes like cytochrome P-450 for homogeneous catalysis.
  • Limited knowledge exists on utilizing substrate-recognition properties of porphyrins with additional active sites.
  • Enzyme-like substrate selectivity is a key goal in catalyst design.

Purpose of the Study:

  • To develop novel supramolecular ligands based on metalloporphyrins with tailored active sites.
  • To investigate the substrate-recognition and catalytic properties of these new ligands.
  • To achieve enzyme-like substrate selectivity in palladium-catalyzed reactions.

Main Methods:

  • Synthesis of metalloporphyrin-derived supramolecular ligands with palladium-coordinating nitrile groups.
  • Characterization using Nuclear Magnetic Resonance (NMR) and UV/Vis spectroscopy, and X-ray Diffraction (XRD).
  • Evaluation of catalytic performance in palladium-catalyzed Suzuki-Miyaura reactions with varying substrate binding.

Main Results:

  • Supramolecular ligands successfully accommodate pyridine derivatives within the porphyrin pocket.
  • Catalytic activity is modulated by tuning a remote metal center, influencing substrate binding.
  • High substrate selectivity was observed in palladium-catalyzed Suzuki-Miyaura reactions, demonstrating an enzyme-like feature.

Conclusions:

  • The developed metalloporphyrin supramolecular ligands exhibit enzyme-like substrate recognition and selectivity.
  • This approach offers a new strategy for designing highly selective homogeneous catalysts.
  • Tuning remote metal centers provides a method to control catalyst reactivity and substrate binding.