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Solvent-dependent transition states for decarboxylations.

D Sicinska1, D G Truhlar, P Paneth

  • 1Institute of Applied Radiation Chemistry, Technical University of Lodz, Zeromskiego 116, 90-924 Lodz, Poland.

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|August 2, 2001
PubMed
Summary
This summary is machine-generated.

Solvent choice significantly impacts 4-pyridylacetic acid decarboxylation rates and isotope effects. Quantum mechanical modeling accurately explains these experimental solvent effects.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Chemical Kinetics

Background:

  • The decarboxylation of 4-pyridylacetic acid exhibits significant solvent dependence.
  • Understanding this solvent effect is crucial for reaction mechanism elucidation.

Purpose of the Study:

  • To interpret the observed solvent dependence of rate constants and kinetic isotope effects for 4-pyridylacetic acid decarboxylation.
  • To validate a quantum mechanical solvation model through comparison with experimental data.

Main Methods:

  • Utilized a quantum mechanical solvation model incorporating class IV charges and semiempirical atomic surface tensions.
  • Calculated the solvent dependence of the free energy barrier.
  • Computed (13)C and (18)O kinetic isotope effects.

Main Results:

  • The model successfully reproduced the experimental solvent dependence of rate constants and kinetic isotope effects.
  • Transition state location (C-C bond length) was found to be 0.24 Å later in dioxane and 0.37 Å later in water compared to the gas phase.
  • Charge development on the CO(2) moiety at the transition state was greater in dioxane than in water (0.07 electronic charge units).

Conclusions:

  • The quantum mechanical solvation model provides a consistent and accurate interpretation of experimental results.
  • The agreement between theory and experiment validates the physical picture of the reaction mechanism derived from the model.
  • Solvent polarity significantly influences both the transition state structure and charge distribution during decarboxylation.