Some correlations involving 13C chemical shifts of monosubstituted derivatives of hexafluorobenzene

Abstract

¹³ C Chemical shifts in a series of 17 mono-substituted derivatives of hexafluorobenzene have been measured and correlations sought with (i)¹³C shifts of monosubstituted benzenes and para-substituted fluorobenzenes; (ii)¹⁹F chemical shifts of monosubstituted hexafluorobenzenes; and (iii) Taft's σ_i and σ_R reactivity parameters. The nuclear Overhauser enhancement in our ¹³C-{¹⁹F} experiments is shown to be small.