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Basic Phosphonium Ionic Liquids as Wittig Reagents.

Dzmitry S Firaha1, Anna V Gibalova1, Oldamur Hollóczki1

  • 1Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstr. 4+6, D-53115 Bonn, Germany.

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|August 29, 2019
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Summary
This summary is machine-generated.

Researchers theoretically explored phosphonium-based ionic liquids (ILs) as potential Wittig reaction solvents. These ILs can generate phosphorous ylides, facilitating the Wittig reaction and offering applications in synthesis and separation.

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Area of Science:

  • Theoretical Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • The Wittig reaction is a cornerstone of organic synthesis for alkene formation.
  • Traditional Wittig reagents often require harsh conditions or generate stoichiometric waste.
  • Ionic liquids (ILs) offer tunable properties as reaction media but their application in Wittig reactions is underexplored.

Purpose of the Study:

  • To theoretically investigate the potential of phosphonium-based ionic liquids (ILs) as integrated solvents and reagents for the Wittig reaction.
  • To explore the feasibility of generating phosphorous ylides in situ within these ILs.
  • To assess the energetic viability of subsequent Wittig reaction steps and potential byproducts.

Main Methods:

  • Theoretical exploration of R4P+PhO- and Ph3PR+PhO- ionic liquids.
  • Molecular dynamics simulations to analyze hydrogen bonding and proton transfer.
  • Computational analysis of reaction pathways and energy profiles for ylide formation and Wittig reaction steps.

Main Results:

  • Phenolate anions in phosphonium-based ILs can abstract α-protons, forming phosphorous ylides.
  • Significant hydrogen bonding and inherent proton transfer support ylide formation.
  • The mesoscopic structure of these ILs shows domain segregation, aiding substrate dissolution.
  • Formation of neutral, volatile pentacoordinated phosphorus species is theoretically possible.

Conclusions:

  • Phosphonium-based ILs with basic anions are promising candidates for Wittig reaction solvents and reagents.
  • In situ ylide generation and subsequent reaction steps are energetically feasible.
  • The unique properties of these ILs suggest potential applications in ion-exchange, separation techniques, and organic synthesis.