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Rearrangements involving the phenonium ion: a theoretical investigation
E del Río1, M I Menéndez, R López
1Departamento de Química Física y Analítica, Facultad de Química, Universidad de Oviedo, C/Julián Clavería, 8, 33006 Oviedo, Principado de Asturias, Spain.
Journal of the American Chemical Society
|July 18, 2001
Summary
This study reveals that solvent effects significantly stabilize the phenonium ion rearrangement, lowering the energy barrier for isomerization to the alpha-methylbenzyl ion. This computational investigation provides key insights into reaction mechanisms in both gas and solution phases.
Area of Science:
- Computational Chemistry
- Organic Reaction Mechanisms
- Physical Organic Chemistry
Background:
- Phenonium ion rearrangements are crucial in organic chemistry.
- Understanding solvent effects is vital for predicting reaction outcomes.
- Previous studies lacked detailed computational analysis of these specific rearrangements.
Purpose of the Study:
- To computationally investigate rearrangements involving the phenonium ion.
- To elucidate the role of solvent effects on the reaction pathway and energy barriers.
- To rationalize experimental observations in both gas and solution phases.
Main Methods:
- Utilized B3LYP/6-311G(d,p) density functional theory.
- Incorporated solvent effects using the Polarizable Continuum Model (PCM).
- Characterized transition states and intermediates to map the potential energy surface.
Main Results:
- Identified protonated benzocyclobutene as a minimum energy structure.
- Demonstrated preferential stabilization of the transition state (TS) for phenonium ion isomerization in solution.
- Quantified the reduction in the Gibbs energy barrier from 26.6 kcal/mol (gas phase) to 18.7 kcal/mol (solution).
Conclusions:
- Solvent effects play a significant role in stabilizing the transition state for phenonium ion rearrangement.
- The computational model successfully rationalizes experimental data.
- The findings provide a deeper understanding of the factors governing organic reaction mechanisms in different environments.
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