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Selectivity and Theoretical Studies of Cycloaddition Reactions

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Computational and Theoretical Chemistry".

Deadline for manuscript submissions: 31 May 2026 | Viewed by 1114

Special Issue Editors


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Guest Editor
Department of Organic Chemistry and Technology, Cracow University of Technology, Warszawska 24, 31-155 Krakow, Poland
Interests: cycloaddition reactions; nitrocompounds; cycloaddition; heterocycles; reaction mechanisms; organic reactivity; DFT calculations
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Department of Organic Chemistry and Technology, Cracow University of Technology, Warszawska 24, 31-155 Krakow, Poland
Interests: cycloaddition reactions; heterocycles; nitrocompounds; reaction mechanisms; regio- and stereoselectivity; DFT calculations; molecular electron density theory (MEDT)
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Łukasiewicz Research Network—Institute of Heavy Organic Synthesis “Blachownia”, Energetyków 9, 47-225 Kędzierzyn-Koźle, Poland
Interests: synthesis; organic chemistry; environmental science; catalysis; cycloaddition reactions

Special Issue Information

Dear Colleagues,

Cycloaddition reactions represent a cornerstone in synthetic organic chemistry, enabling the efficient construction of cyclic frameworks with full atomic economy. This Special Issue focuses on the selectivity (chemo-, regio-, and stereoselectivity) and theoretical studies of cycloaddition reactions, highlighting recent advances in mechanistic insights, computational modeling, and predictive design. Contributions will explore the interplay between electronic, steric, and catalytic control in governing reaction pathways, as well as the application of modern quantum chemical methods (e.g., DFT, MD, and machine learning) to elucidate pseudocyclic processes. Topics include [2+1], [2+2], [3+2], [4+2], [4+3], and higher-order cycloadditions, asymmetric variants, and emerging catalytic systems. By integrating experimental and theoretical perspectives, this Special Issue provides a comprehensive resource for researchers pursuing precision in carbo- and heterocyclic molecule synthesis.

Prof. Dr. Radomir Jasiński
Dr. Agnieszka Łapczuk
Dr. Ewa Dresler
Guest Editors

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Keywords

  • cycloaddition
  • selectivity
  • density functional theory (DFT)
  • reaction mechanisms
  • catalysis
  • stereocontrol

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Published Papers (1 paper)

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Research

20 pages, 2363 KB  
Article
On the Question of the Application Potential and the Molecular Mechanism of the Formation of 1,3-Diaryl-5-Nitropyrazoles from Trichloromethylated Diarylnitropyrazolines
by Karolina Kula and Radomir Jasiński
Molecules 2025, 30(21), 4306; https://doi.org/10.3390/molecules30214306 - 5 Nov 2025
Cited by 2 | Viewed by 821
Abstract
The molecular mechanism of the formation of 1,3-diaryl-5-nitropyrazoles via a CHCl3-elimination reaction was investigated using ωB97xD/6-31+G(d,p) (PCM) calculations. It was found that, regardless of the polarity of the reaction environment or the nature of the substituents on the phenyl rings of [...] Read more.
The molecular mechanism of the formation of 1,3-diaryl-5-nitropyrazoles via a CHCl3-elimination reaction was investigated using ωB97xD/6-31+G(d,p) (PCM) calculations. It was found that, regardless of the polarity of the reaction environment or the nature of the substituents on the phenyl rings of the starting molecules, the elimination process proceeds through a single-step mechanism characterized by an extremely asynchronous transition state. The ELF (Electron Localization Function) analysis of selected critical structures confirms the proposed mechanism and reveals a pronounced reorganization of electrons within the heterocyclic ring. The in silico analysis based on ADME (Activity, Distribution, Metabolism, and Excretion) and PASS (Prediction of Activity Spectra for Substances) predictions indicates that the title 1,3-diaryl-5-nitropyrazoles exhibit promising biological potential, showing inhibitory activity against both oxidoreductases and proteases. The most consistent targets include hyponitrite reductase, (R)-6-hydroxynicotine oxidase, acrocylindropepsin, saccharopepsin, and chymosin. Thus, the presented CHCl3-elimination provides an efficient and versatile route to functionalized pyrazoles, and, together with their promising bioactivity, confirms the utility of this approach for their synthesis. Full article
(This article belongs to the Special Issue Selectivity and Theoretical Studies of Cycloaddition Reactions)
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