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Solvent effects on stereoselectivity: more than just an environment
Gianfranco Cainelli1, Paola Galletti, Daria Giacomini
1Department of Chemistry G.Ciamician, University of Bologna, Via Selmi 2, 40126 Bologna, Italy.
Dynamic solvation effects influence stereoselective reactions. This study explores how solvent interactions create distinct solute-solvent clusters, acting as the key reactive species and explaining inversion temperature phenomena in organic synthesis.
Area of Science:
- Organic Chemistry
- Physical Chemistry
- Chemical Kinetics
Background:
- Stereoselectivity is crucial in organic synthesis, impacting reaction outcomes.
- Solvent effects on diastereoselectivity and enantioselectivity are extensively studied.
- Dynamic solvation effects are increasingly recognized as significant.
Purpose of the Study:
- To review examples of non-linear Eyring plots in various stereoselective reactions.
- To investigate the role of solvents in dynamic solvation effects.
- To propose a hypothesis explaining the inversion temperature phenomenon.
Main Methods:
- Analysis of experimental data from stereoselective nucleophilic additions, cycloadditions, photochemical, and enzymatic reactions.
- Temperature-dependent measurements of diastereomeric and enantiomeric ratios.
- Spectroscopic analyses in diverse solvents (hydrocarbons, halohydrocarbons, ethers).
Main Results:
- Observed non-linear Eyring plots across multiple reaction types.
- Demonstrated influence of solvent composition on stereochemical outcomes.
- Gathered evidence supporting the existence of distinct solute-solvent clusters.
Conclusions:
- The inversion temperature phenomenon is attributed to an equilibrium between different solute-solvent clusters.
- These clusters are identified as the actual reactive species in solution.
- Dynamic solvation plays a critical role in controlling stereoselectivity in organic reactions.
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