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Relative activation free energy of radical dissociation for pyridinium systems vs Hammett parameters. Note that the values of relative activation free energies obtained using relative Δ𝐺0RED (see Table 1) via Δ𝐺≠𝑅𝐷 𝑟𝑒𝑙=Δ𝐺0RED+Δ𝐺≠𝑅𝐷. Absolute values of Δ𝐺≠𝑅𝐷 𝑟𝑒𝑙 will depend on the exact nature of the reductant used. Black and white markers represent N–i-Pr and N-Cy respectively.
