NMR study of the monomer—dimer equilibria of dimethylnitrosobenzenes in solution. Identification of mixed azodioxy dimeric species

The monomer‐dimer equilibria of 2,6‐ and 3,5‐dimethylnitrosobenzenes in CDCI3 solution were investigated by 1H and/or 13C NMR spectroscopy. The mixed systems nitrosobenzene + 2,6‐dimethylnitrosobenzene and 2,6‐dimethylnitrosobenzene + 3,5‐dimethylnitrosobenzene were also studied, and mixed azodioxy dimers were identified. In all systems exchange occurs exclusively between dimer and monomer species, rates and activation energies being calculated from time‐dependent 1H 1D spectra and/or 1H 2D‐EXSY spectra measured at different temperatures.