Abstract
The C NMR spectra of a large number of stereochemically well-defined model compounds possessing heteroatoms have been obtained and assigned. An analysis of the data provided the following conclusions: (1) hyperconjugative π-polarization is an important, component of the net electronic effect of -CHX groups in the neutral ground state; (2) polar field effects play an important role in determining aryl C chemical shifts; and (3) the γ shielding effect of second-row heteroatoms is a very general phenomenon.
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