Abstract
Context
[3+2] cycloaddition processes between isoalantolactone (ISALL) and diazocyclopropane (DCYP), have been surveyed exercising the MEDT, reactivity indices, reactions, and activation energies, are computed. In an investigation of conceptual DFT indices, DCYP behaves as a nucleophile in this reaction, whereas ISALL acts as an electrophile. This cyclization is stereo-, chemo-, and regiospecific, as demonstrated by the activation and reaction energies, in clear agreement with the experiment’s results. The mechanism for this [3+2] cycloaddition is occurring in two steps, according to ELF analysis.
Methods
For the purposes of this investigation, all computations were performed using the Gaussian 09 program. The optimization was completed using Berny’s computational gradient optimization approach with the basis set 6-311G(d,p) and wB97XD functional. Frequency computations were utilized to characterize and locate stationary points where the transition phases have just one imaginary frequency and all frequencies for the reactants and products are positive. After evaluating the effect of dichloromethane (DCM) as a reaction solvent, the stationary point optimization was updated using the polarizable continuum model (PCM) developed by the Tomasi team. The electron localization function (ELF) has been examined within the context of topological investigations using Multiwfn software with a 0.05 grid step.
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The authors confirm that the data supporting the findings of this study are available within the article and its supplementary material.
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The authors extend their appreciation to the Researchers Supporting Project number (RSP2023R15), King Saud University, Riyadh, Saudi Arabia.
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Anas Ouled Aitouna, Ali Barhoumi, and Mohammed Elalaoui Belghiti: article writing. Abdellah Zeroual, Habib El Alaoui El Abdallaoui, and Noureddine Mazoir: numerical calculations and acquisition of data. Ali H. Bahkali and Meenakshi Verma: revising and editing language. Mohammed Elalaoui Belghiti Abdellah Zeroual and Asad Syed: final review and editing. All authors: analysis and interpretation of data and drafting the article.
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Ouled Aitouna, A., Barhoumi, A., El Alaoui El Abdallaoui, H. et al. Explaining the selectivities and the mechanism of [3+2] cycloloaddition reaction between isoalantolactone and diazocyclopropane. J Mol Model 29, 280 (2023). https://doi.org/10.1007/s00894-023-05688-0
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DOI: https://doi.org/10.1007/s00894-023-05688-0