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Related Experiment Videos

Proton exchanges between phenols and ammonia or amines: a computational study.

Yun-Xiang Lu1, Jian-Wei Zou, Zhi-Min Jin

  • 1Ningbo Institute of Technology, Zhejiang University, Ningbo, 315100, China.

The Journal of Physical Chemistry. A
|July 21, 2006
PubMed
Summary

Density functional theory reveals proton exchange mechanisms between phenols and ammonia or amines. Substituent effects and solvent interactions significantly influence activation barriers, highlighting the role of proton transfer in these reactions.

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Area of Science:

  • Computational Chemistry
  • Physical Chemistry
  • Quantum Chemistry

Background:

  • Proton exchange reactions between phenols and nitrogenous bases are crucial in various chemical and biological processes.
  • Understanding these reactions is essential for interpreting experimental data, such as Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Previous studies have explored these interactions, but detailed mechanistic insights require advanced computational approaches.

Purpose of the Study:

  • To computationally investigate the mechanism and energetics of proton exchange reactions between phenols and ammonia/amines.
  • To elucidate the influence of substituents on phenol rings and steric factors on the proton exchange process.
  • To explore the impact of solvent effects and radical cation systems on the proton transfer dynamics.

Main Methods:

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  • Density Functional Theory (DFT) calculations at the B3LYP/6-31+G(d,p) level of theory.
  • Intrinsic Reaction Coordinate (IRC) analysis to determine reaction pathways.
  • Investigation of various substituted phenols, amines, and solvent environments.

Main Results:

  • Located a transition state for the phenol-NH(3) system with a significant energy barrier (35 kcal mol(-1)).
  • Demonstrated that electron-withdrawing groups decrease the barrier, while electron-donating groups increase it.
  • Found a linear correlation between activation barriers and interaction energies, emphasizing hydrogen bonding's role.
  • Observed favorable proton exchange with secondary amines and a significant role for steric effects and moiety flipping.
  • Showed that solvent effects remarkably decrease barrier heights due to the transition state's ion pair character.
  • Identified barrierless proton transfer in phenol radical cation-NH(3) systems.

Conclusions:

  • Proton exchange between phenols and ammonia/amines is a concerted process influenced by electronic and steric factors.
  • Hydrogen bonding and proton transfer are key determinants of the activation barriers.
  • Solvent effects play a crucial role in modulating the energetics of proton exchange.
  • The study provides a detailed mechanistic understanding relevant to NMR interpretations and chemical reactivity.