The structural dependence of the inductive effect. Part V. Effects of vicinal substituents on the shielding of fluorine-19 nuclei in saturated compounds of fixed conformation, and in fluoro-olefins and ortho-substituted fluorobenzenes

Abstract

The model previously developed for the calculation of chemical shifts in conformationally averaged aliphatic systems is extended to rigid systems and some trends are discussed. A successful extension to include π-electronic interactions allows the accurate calculation of shielding differences in a variety of mixed halogenofluoro-olefins and in ortho-halogenofluorobenzenes.