Conclusions
From13C,15N,17O,19F,29Si,31P,73Ge,77Se,119Sn, and125Te NMR data, it follows that complete replacement of phenyl hydrogen atoms by fluorine in compounds C6H5X leads to a systematic increase in shielding of nuclei in the ring carbon atom bonded to the X group and in shielding of the nucleus of the α-atom of X, along with deshielding of the nuclei of the Β- and γ-atoms of X. The effect evidently has a long-range character and can be described by the extended theory of Dewar and Kelemen.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 829–832, April, 1989.
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Zibarev, A.V., Fedotov, M.A. & Fürin, G.G. Effect of fluorine replacement of hydrogen atoms in aromatic compounds on magnetic shielding of nuclei of heavy atoms at a distance from position of substitution. Russ Chem Bull 38, 744–747 (1989). https://doi.org/10.1007/BF00953284
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DOI: https://doi.org/10.1007/BF00953284