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Computational study on the prototropic tautomerism between simple oxo-, thio-, carbon-, aza-hydrazones, and their respective azines

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Abstract

Most hydrazone compounds prefer the azine tautomeric states. However, oxygen-/sulfur-substituted compounds prefer hydrazone tautomers. In this study, density functional theory at M062X level with the basis set of 6–311 +  + g(2d, 2p), with MP2/cc-pVTZ for reference, was used to investigate the different tautomeric mechanisms between hydrazone and azine forms with oxygen, sulfur, carbon, and nitrogen as negative centers. The energetic stabilities are in the order as oxygen- < sulfur- < imine- < amidino- < carbene-substituted hydrazones with respect to their azine tautomeric structures. Resonance of the molecular structures might be the geometrical basis for their energy stabilities and were estimated based on HOMED indices. Further, the increased proton affinities in the trend as hydroxyl < sulfhydryl < imine terminal groups account for their increasing azine preferences. Proton release was examined for the reversible equilibrium from azine to hydrazone by calculating the transition energy barrier of H transfer. It is favorable to form hydrazone tautomers for oxygen and sulfur containing groups, while it is less favorable for amino-substituted ones. Azine form is the most stable tautomer for methyl substituted.

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Acknowledgements

We all thank professor Jianping Wang for his helpful advice.

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Guixiu Wang wrote the main manuscript text, Qing Han prepared Figs. 1–4. Rongxiu Zhu gave some useful suggestions on this manuscript.

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Correspondence to Guixiu Wang.

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Wang, G., Han, Q. & Zhu, R. Computational study on the prototropic tautomerism between simple oxo-, thio-, carbon-, aza-hydrazones, and their respective azines. J Mol Model 28, 393 (2022). https://doi.org/10.1007/s00894-022-05387-2

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  • DOI: https://doi.org/10.1007/s00894-022-05387-2

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