1H-2,3-Benzodiazepines are isomerised to benzo[c]-1,7-diazabicyclo[3,2,0]hepta-3,6-dienes on irradiation and do not react via extrusion of nitrogen; the 5H-isomers undergo a similar reaction followed by loss of nitrogen to give indenes.
A. A. Reid, J. T. Sharp and S. J. Murray, J. Chem. Soc., Chem. Commun., 1972, 827 DOI: 10.1039/C39720000827
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