Fig. 5. Correlations of (A) experimental Gibbs activation energies ΔG^‡_exp and (B) Mayr electrophilicity descriptors E with quantum-chemically calculated Gibbs activation barriers ΔG^‡_calcd(TS1) for the reactions of 7 with the electrophiles 1–5 at the SMD(DMSO)/M06-2X/6-31+G(d,p) level of theory (ΔG^‡ in kJ mol⁻¹).