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Sigma Hole Potentials as Tools: Quantifying and Partitioning Substituent Effects.

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Substituent effects on monoiodinated benzene rings were quantified using computational electrostatic potentials. This method offers an alternative to experimental substituent constants for predicting chemical reactivity and bonding.

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Area of Science:

  • Organic Chemistry
  • Computational Chemistry
  • Physical Chemistry

Background:

  • Empirical substituent constants, like Hammett parameters, are vital for predicting chemical reactivity and understanding bonding.
  • Established methods for determining substituent effects often involve complex experimental procedures.

Purpose of the Study:

  • To assess the impact of substituents on monoiodinated benzene rings.
  • To develop a computational alternative for quantifying substituent effects.
  • To propose a method for separating sigma and pi contributions to substituent effects.

Main Methods:

  • Computational analysis of electrostatic potentials at the sigma hole of the iodine atom in substituted benzene rings.
  • Correlation of calculated potentials with established substituent trends.
  • Development of a partitioning scheme to separate sigma and pi contributions.

Main Results:

  • Modifications in electrostatic potentials induced by substituents strongly correlate with known substituent trends.
  • Computationally derived constants based on electrostatic potentials provide a quantitative measure of substituent influence.
  • The proposed partitioning scheme successfully separates sigma and pi contributions.

Conclusions:

  • Computational determination of electrostatic potentials offers a viable and efficient alternative to experimental methods for substituent constant determination.
  • This approach provides a robust model for quantifying the influence of diverse substituents on chemical compounds.
  • The ability to discretely measure sigma and pi contributions enhances the understanding of substituent effects on chemical properties.