hexamethyl-benzene in dichloromethane-d2 mixt. of Fe-complex, hexamethylbenzene standard (molar ratio 1:0.25) and CD2Cl2 cooled to -40°C, 1 equiv of CF3SO3H added; without isolation; monitored by (1)H NMR spectra;

hexamethyl-benzene in dichloromethane-d2 mixt. of Fe-complex, hexamethylbenzene standard (molar ratio 1:0.25) and CD2Cl2 cooled to -40°C, 1 equiv of CF3SO3H added; without isolation; monitored by (1)H NMR spectra;