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Exploring the Relationship between Reactivity and Electronic Structure in Isorhodanine Derivatives Using Computer
Michal Michalski1, Slawomir Berski2
1Centre of New Technologies, University of Warsaw, 02-097 Warsaw, Poland.
This study explores the electronic structure and reactivity of isorhodanine (IsRd) derivatives in Diels-Alder reactions. Findings reveal both inverse and normal electronic demand characteristics, offering insights into molecular aromaticity and reactivity.
Area of Science:
- Computational Chemistry
- Organic Chemistry
- Quantum Chemistry
Background:
- The Diels-Alder reaction is a fundamental organic transformation.
- Understanding the electronic structure of isorhodanine (IsRd) derivatives is crucial for predicting their reactivity.
- Investigating molecular behavior in different environments (gas phase vs. solvent) is essential.
Purpose of the Study:
- To investigate the electronic structure and reactivity of 22 isorhodanine (IsRd) derivatives in Diels-Alder reactions with dimethyl maleate (DMm).
- To analyze reactivity under both gas phase and continuous acetic acid solvent conditions.
- To explore the aromaticity and electronic properties of the IsRd core.
Main Methods:
- Utilized free Gibbs activation energy and free Gibbs reaction energy calculations.
- Employed frontier molecular orbital (FMO) theory to analyze reactivity.
- Applied the HOMA (Harmonic Oscillator Model for Aromaticity) index to assess aromaticity.
- Performed topological analysis of electron density and electron localization function (ELF).
Main Results:
- Identified both inverse electronic demand (IED) and normal electronic demand (NED) characteristics in the Diels-Alder reactions.
- Provided insights into the aromaticity of the isorhodanine ring system.
- Demonstrated that electron localization function (ELF) successfully captures chemical reactivity.
Conclusions:
- The study elucidates the electronic structure and reactivity patterns of isorhodanine derivatives in Diels-Alder reactions.
- The findings highlight the dual electronic demand characteristics and aromaticity of the IsRd core.
- Electron localization function (ELF) analysis is a valuable tool for understanding molecular electronic structure and reactivity.
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