the quoted correlation equation when both types of leavinggroups were used to determine the electrofugality parameters Ef. As 1,3-diarylalyl cations are generated faster in solvolysisreactions and also react faster with nucleophiles than benzhydrylium ions of similar thermodynamic stabilities, i.e., Lewis acidities, one can conclude that the reactions involving 1,3-diarylallyl cations proceed with lower