Frozen solution Mössbauer spectra collected at 80 K in the presence of a 50 mT parallel magnetic field. (A) Spectrum of 1 (0.64 mM in THF); (B) a catalytic mixture (Et2O, 0.64 mM 1, 48 equiv HBArF4, 58 equiv KC8) freeze-quenched after 5 minutes of stirring at −78 °C; (C) a catalytic mixture (Et2O, 0.64 mM 1, 48 equiv HBArF4, 58 equiv KC8) freeze-quenched after 25 minutes of stirring at −78 °C. Data are presented as black points and simulations as solid grey lines with components plotted as solid areas underneath the curve. For parameters of individual components see the SI.