Abstract
According to CAM–B3LYP/6-311++G(d,p) quantum chemical calculations, intramolecular migration of the arylazo group in pentamethyl 5-(aryldiazenyl)cyclopentadiene-1,2,3,4,5-pentacarboxylates follows a dissociative mechanism through intermediate formation of tight ion pairs with a low energy barrier [ΔE≠ZPE = 14.0 and 16.5 kcal for Ar = C6H4NO2-4 and C6H3(NO2)2-2,4, respectively, in benzonitrile]. The arylazo group in 5-(aryldiazenyl)-1,2,3,4,5-pentamethylcyclopentadienes migrates via 1,5-sigmatropic shifts along the perimeter of the five-membered ring with exo orientation of the azo group with respect to that ring, and the migration process is characterized by significantly higher activation barriers [ΔE≠ZPE = 30.3 and 27.5 kcal/mol for Ar = C6H4NO2-4 and C6H3(NO2)2-2,4, respectively, in benzonitrile]. The calculated data are in good agreement with our previous results obtained by dynamic NMR.
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The authors declare the absence of conflict of interest.
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This study was financially supported by the Ministry of Science and Higher Education of the Russian Federation in the framework of state assignment in the sphere of research activity (project no. FENW-2023-0017).
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Translated from Zhurnal Organicheskoi Khimii, 2023, Vol. 59, No. 9, pp. 1193–1208 https://doi.org/10.31857/S0514749223090094.
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Dushenko, G.A., Mikhailov, I.E. & Minkin, V.I. Circumambulatory Migrations of Arylazo Groups in Pentakis(methoxycarbonyl)- and Pentamethylcyclopentadienes. Russ J Org Chem 59, 1523–1536 (2023). https://doi.org/10.1134/S1070428023090099
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DOI: https://doi.org/10.1134/S1070428023090099