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Deciphering Stereoselectivity in Hurd-Claisen Rearrangements: A Comprehensive Study of Electrostatic Interactions
Ana Gabriela Coelho Oliveira1, Mateus Rodrigues Barbosa1, Pedro Henrique Ferreira Matias2
1Laboratório de Estrutura Eletrônica e Dinâmica Molecular (LEEDMOL), Instituto de Química, Universidade Federal de Goiás, Campus Samambaia, 74690-900 -, Goiânia, GO, Brazil.
Stereoselectivity in Hurd-Claisen Rearrangements is governed by kinetic factors, not just equilibrium. Electrostatic interactions, analyzed via energy decomposition, are key drivers of stereochemical outcomes in these organic reactions.
Area of Science:
- Organic Chemistry
- Computational Chemistry
- Reaction Mechanisms
Background:
- Hurd-Claisen rearrangements are important synthetic transformations.
- Understanding stereoselectivity is crucial for controlling reaction outcomes.
- Previous studies have not fully elucidated the factors governing stereoselectivity in this reaction.
Purpose of the Study:
- To investigate the stereoselectivity of Hurd-Claisen Rearrangements.
- To determine the influence of electron-withdrawing groups and substituents on stereoselectivity.
- To elucidate the role of kinetic and electrostatic factors in controlling reaction pathways.
Main Methods:
- Computational modeling using the M062X/def2TZVPP composite model.
- Energy calculations for reactants, products, and transition states.
- Shubin's energy decomposition analysis applied to optimized transition states.
Main Results:
- Kinetic factors were found to predominantly control the reaction equilibrium.
- Electrostatic interactions play a significant role in determining stereoselectivity.
- Analysis of fragmented transition states revealed the impact of group dipole moments on electrostatic forces.
Conclusions:
- Stereoselectivity in Hurd-Claisen Rearrangements is primarily dictated by kinetic control.
- Electrostatic interactions are a critical determinant of stereochemical preference.
- This study provides a deeper mechanistic understanding of Hurd-Claisen Rearrangements with implications for organic synthesis.
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