Abstract
The effects of chemical modification on the kinetics of GSPT in 6R2PY-NH3 (R=NO2, CF3, COOH; CH3, C2H5) complex, in which the H atom at C6 position of 2PY was substituted, were researched in detail at the M06-2X/6-311 + G(d, p) level. The changes of structural parameter, reaction mechanism, and energies of GSPT before and after the replacement with different substituent have been analyzed. GSPT process in the 6R2PY-NH3 (R=NO2, CF3, COOH; CH3, C2H5) complex preferred to occur via a concerted but asynchronous protolysis pathway regardless of the electronic nature of substituent R. However, the structural parameters, asynchronicity of GSPT, and barrier height were influenced by the different substituent. The Hammett’s and Taft’s substituent constant had linear correlation with ∆(R1 + R2), NBO charges of NH4+ and ∆∆V.
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Acknowledgements
This work was supported by grants from the National Natural Science Foundation of China (No. 21403114) and the Natural Science Foundation of Jiangsu province (No. BK20140970).
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Ni, M., Fang, H. Theoretical study on kinetics of ammonia-catalyzed ground-state tautomerization in 2-pyridone: effect of chemical modification. Chem. Pap. 73, 1561–1569 (2019). https://doi.org/10.1007/s11696-019-00711-2
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DOI: https://doi.org/10.1007/s11696-019-00711-2