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Related Experiment Videos

A computational study of lithium enolate mixed aggregates.

Lawrence M Pratt1, Andrew Streitwieser

  • 1Department of Chemistry, Fisk University, 1000 17th Avenue North, Nashville, Tennessee 37208, USA. lpratt@fisk.edu

The Journal of Organic Chemistry
|March 29, 2003
PubMed
Summary
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Computational studies reveal that mixed trimers, specifically 2LiOV.LiX, are favored aggregates of lithium vinyloxide (LiOV) with lithium salts in the gas phase. Solvation effects in ethereal solvents reduce aggregation exothermicity, influencing aggregate stability and population at room temperature.

Area of Science:

  • Computational Chemistry
  • Organometallic Chemistry
  • Physical Chemistry

Background:

  • Lithium enolates are key intermediates in organic synthesis.
  • Understanding aggregation behavior of lithium salts is crucial for reaction control.
  • Previous studies have explored homoaggregate formation, but mixed aggregates are less understood.

Purpose of the Study:

  • To investigate the formation and stability of mixed dimer and trimer aggregates between lithium vinyloxide and various lithium salts.
  • To elucidate the influence of solvation effects on the aggregation process.
  • To compare the aggregation preferences of different lithium salts, including halides and amides.

Main Methods:

  • Ab initio calculations were employed to model aggregate structures and energies.

Related Experiment Videos

  • Gas-phase calculations were performed to establish baseline stability.
  • Solvation effects were modeled using a combination of specific ligand coordination and dielectric continuum methods (DSE).

    • Main Results:

    • In the gas phase, the mixed trimer 2LiOV.LiX was identified as the most stable species.
    • Solvation in ethereal solvents, particularly THF, reduced the exothermicity of aggregation.
    • Dielectric solvation energy (DSE) was less significant for aggregates than for monomers.
    • Lithium amides showed a preference for forming mixed aggregates with weaker bases over homoaggregates.

    Conclusions:

    • The computational findings provide insights into the complex aggregation behavior of lithium enolates and lithium salts.
    • Solvation plays a significant role in modulating the stability and population of mixed aggregates.
    • The results align with existing experimental observations, supporting the predictive power of the computational approach.