Abstract
Although methyl transfer reactions are important in both chemical and biological systems, there is a need for thermodynamic parameters related to methyl affinity and O–CH3 bond dissociation enthalpies (BDEs) relevant to a full understanding of the mechanisms of methyl transfer reactions. As a prelude to the construction of a database of O–CH3 BDEs, the present work examines the reliability of a series of theoretical methods for the prediction of O–CH3 BDEs using a set of 25 compounds that included both aromatic and non-aromatic molecules. The BDEs calculated by density functional theory (DFT) with traditional exchange–correlation functions exhibited much larger errors than those obtained by either the M06-2X or G4 methods. For the non-aromatic compounds, M06-2X/def2-TZVP performed slightly better than G4, but G4 was more accurate for the aromatic molecules. As a result, we recommend G4 as the preferred method for the theoretical estimation of O–CH3 bond dissociation enthalpies, although M06-2X may be a good alternative for large complex molecules when the use of G4 is impractical.
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Acknowledgements
JZ is thankful for the financial support from National Natural Science Foundation of China (NSFC 21772143), the Natural Science Foundation of Tianjin (17JCYBJC42200), Tianjin Youth 1000-Plan Talent Program and Startup Funding of Tianjin University. Generous support by the School of Pharmaceutical Science and Technology, Tianjin University, China, including computer time on the SPST computer cluster Arran is gratefully acknowledged.
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Du, T., Quina, F.H., Tunega, D. et al. Theoretical O–CH3 bond dissociation enthalpies of selected aromatic and non-aromatic molecules. Theor Chem Acc 139, 75 (2020). https://doi.org/10.1007/s00214-020-02592-1
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DOI: https://doi.org/10.1007/s00214-020-02592-1