where, δH is the substituent chemical shift, F and R are the Swain-Lupton substituent parameters for the inductive/field effects and the resonance effects. Parameters f , r and h, are obtained by least-squares regression and represent the sensitivity of the chemical shifts to the inductive and resonance effects of the substituents. The f weight parameter for the inductive effects was proven to be negligible compared to the resonance effects, for which reason we decided to simplify the correlation to only use the R + resonance parameter in Figure . (The results pertaining to this detailed analysis can be found in the Supporting Information.) The calculated chemical shifts agree with the experimental values; these are also included in Figure .