Abstract
The prominent roles of organofluorine compounds in various fields have aroused considerable interest in the development of new methods for carbon-fluorine bond formation. Electrophilic fluorination receives much attention. Density functional theory (DFT) was used to theoretically explore the fluorination activity of 12 N-Fluoropyridinium salts on the substrate of benzene in acetonitrile solution. Geometry optimizations and frequency calculations of the reactants, transition states, and products were performed at B3LYP/6-311G(d,p) level for the 12 fluorination reaction channels. Based on the optimized structure, all the stationary points have been corrected by the single point energy at a high-level of M06-2x/6-311++G (d,p). Four substituents were considered in this paper, they are nitro-, cyano-, chloro-, methoxy-, respectively. Three substituted sites (ortho-, meso-, para-) were also concluded. Based on the obtained potential energy surfaces information and analysis of substituent effect, the fluorination reaction channel of oNO2NFpyr is most efficient due to the lowest reaction energy barrier; therefore, oNO2NFpyr is a promising optimum fluorinating reagent among the studied 12 N-Fluoropyridinium salts.
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We thank the grid computing server provided by the Chinese Academy of Sciences.
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This work is supported by the National Basic Research Program of China (2012CB723308), the National Natural Science Foundation of China (51337002 and 50977019), the Doctoral Foundation by the Ministry of Education of China (20112303110005), and the Science Foundation for Distinguished Young Scholar of Heilongjiang Province (JC201206).
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The geometry coordinates of reactants, transition states and products of twelve fluorination reactions optimized at B3LYP/6-311G(d,p)level (DOC 98 kb)
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Du, X., Zhang, H., Yao, Y. et al. Theoretical study on the fluorination of benzene with N-Fluoropyridinium salts in acetonitrile solution. Struct Chem 29, 1601–1607 (2018). https://doi.org/10.1007/s11224-018-1135-z
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DOI: https://doi.org/10.1007/s11224-018-1135-z