Kinetics of N2 Release from Diazo Compounds: A Combined Machine Learning-Density Functional Theory Study

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2024-01-09
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Language
en
Pages
1106–1112
Series
ACS Omega, Volume 9, issue 1
Abstract
Diazo compounds are commonly employed as carbene precursors in carbene transfer reactions during a variety of functionalization procedures. Release of N2 gas from diazo compounds may lead to carbene formation, and the ease of this process is highly dependent on the characteristics of the substituents located in the vicinity of the diazo moiety. A quantum mechanical density functional theory assisted by machine learning was used to investigate the relationship between the chemical features of diazo compounds and the activation energy required for N2 elimination. Our results suggest that diazo molecules, possessing a higher positive partial charge on the carbene carbon and more negative charge on the terminal nitrogen, encounter a lower energy barrier. A more positive C charge decreases the π-donor ability of the carbene lone pair to the π* orbital of N2, while the more negative N charge is a result of a weak interaction between N2 lone pair and vacant p orbital of the carbene. The findings of this study can pave the way for molecular engineering for the purpose of carbene generation, which serves as a crucial intermediate for many chemical transformations in synthetic chemistry.
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Funding Information: This study was financed by the Academy of Finland with project number 348327. A. H. gratefully acknowledges the Digipower project, supported by Teknologiateollisuuden 100v säätiö and Jane ja Aatos Erkon säätiö. We also thank Finland CSC-IT Center for generous grants of computer time.
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Citation
Farshadfar, K, Hashemi, A, Khakpour, R & Laasonen, K 2024, ' Kinetics of N 2 Release from Diazo Compounds: A Combined Machine Learning-Density Functional Theory Study ', ACS Omega, vol. 9, no. 1, pp. 1106–1112 . https://doi.org/10.1021/acsomega.3c07367