Abstract
The photolysis of chloroform solutions containing 2-methyl-3-acetylquinoxalin N, N-dioxide (MAQO) and dialkyl amines leads to the observation of ESR spectra of the corresponding dialkyl nitroxides. Oxygen-transfer exciplex 5 which derived from the triplet state of MAQO is suggested as intermediate to give nitroxide through N-H bond cleavage in the secondary amine within 5.