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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
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Palladium Bisphosphine Monoxide Complexes: Synthesis, Scope, Mechanism, and Catalytic Relevance.

Shenghua Yang1, Min Deng1, Ryan A Daley1

  • 1Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States.

Journal of the American Chemical Society
|December 17, 2024
PubMed
Summary

This study reveals that partially oxidized phosphine ligands, known as bisphosphine monoxides (BPMOs), can form active palladium catalysts. These BPMO complexes offer a new avenue for developing efficient transition metal catalytic systems.

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Ligand Design

Background:

  • Partial oxidation of chelating phosphine ligands is implicated in forming active species in transition metal catalysis.
  • Bisphosphine monoxides (BPMOs) represent an underexplored class of ligands with potential catalytic applications.

Purpose of the Study:

  • To investigate the internal redox reaction of Pd(II) complexes to form BPMOs.
  • To develop general conditions for synthesizing diverse BPMO precatalysts.
  • To compare the catalytic performance of bisphosphine and BPMO palladium complexes.

Main Methods:

  • Synthesis and characterization of Pd(II)(bisphosphine)X2 complexes.
  • Formation and structural characterization (NMR, X-ray crystallography) of Pd(II)(BPMO)(R)(X) complexes.
  • Evaluation of catalytic activity of bisphosphine and BPMO precatalysts.
  • Solid-state parametrization and stoichiometric experiments to rationalize catalytic behavior.

Main Results:

  • A series of 24 structurally diverse BPMO ligands were incorporated into palladium oxidative addition complexes.
  • Pd(II)(BPMO)(R)(X) complexes were synthesized and characterized.
  • Direct comparison of catalytic performance highlighted the utility of BPMOs as precatalysts.
  • Differences in catalytic behavior were rationalized by experimental data.

Conclusions:

  • Bisphosphine monoxides (BPMOs) are viable precatalysts in palladium catalysis.
  • The study provides a framework for understanding and utilizing BPMOs in catalytic systems.
  • This work expands the scope of ligand design in transition metal catalysis.