19 F Substituent chemical shift (SCS) data for substituents of the type Me3M (where M represents Si, Ge, Sn, and Pb) attached to the naphthalene system provide experimental evidence that all the metalloidal substituents engage in dπ–pπ conjugative electron-withdrawal (–M) in the ground state: and suggested that certain approaches to the analysis of 19F SCS may be invalid.
W. Adcock and W. Kitching, J. Chem. Soc. D, 1970, 1163 DOI: 10.1039/C29700001163
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