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Dynamic Inner-/Outer-Sphere Ligand Exchange in P(V)═O Reduction by Sacrificial Methods.

Jingyang Zhang1, Jing Xue2, Wang-Yeuk Kong3

  • 1School of Pharmaceutical Sciences, MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Beijing Frontier Research Center for Biological Structure, Tsinghua University, Beijing 100084, China.

The Journal of Organic Chemistry
|November 24, 2025
PubMed
Summary
This summary is machine-generated.

This study reveals a novel inner-/outer-sphere ligand exchange mechanism for reducing phosphorus(V)═O bonds using sacrificial phosphorus(III) reagents. This discovery enhances catalytic efficiency and offers new pathways for chemical transformations.

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Area of Science:

  • Organophosphorus Chemistry
  • Catalysis
  • Reaction Mechanisms

Background:

  • Reduction of phosphorus(V)═O bonds is crucial for industrial applications.
  • Sacrificial methods offer a promising route for P═O bond reduction.
  • Understanding the underlying mechanisms is key to optimizing these processes.

Purpose of the Study:

  • To investigate the mechanism of oxygen atom transfer between P(V)═O substrates and P(III) reagents.
  • To elucidate the role of ligand exchange in catalytic sacrificial systems.
  • To identify factors influencing the efficiency of P═O bond reduction.

Main Methods:

  • Computational modeling (density functional theory).
  • Experimental studies using a catalytic sacrificial system.
  • Systematic evaluation of various initiators and substrates.

Main Results:

  • Identified a distinctive inner-/outer-sphere ligand exchange mechanism.
  • Demonstrated selective coordination of ligands to lower activation barriers.
  • Explained the high reactivity of diethyl 2-bromomalonate (DEBM) as an initiator.
  • Confirmed the generality of the ligand exchange process across different systems.
  • Observed diminished efficiency with trialkyl-substituted substrates.

Conclusions:

  • The ligand exchange mechanism provides key mechanistic insights into sacrificial P═O bond reduction.
  • This mechanism explains the superior performance of specific initiators like DEBM.
  • The findings lay the groundwork for rationally designing and exploiting ligand exchange in chemical transformations.
  • The discovered mechanism has potential applications in phosphonium-based ion-pair systems.