Thermolysis of the 1H-1,2-diazepines having an electron-donating substituent in the 4- or 6-position affords the corresponding 1,3-diazepines, whereas 1,2-diazepines having electron-withdrawing substituents do not show this ring-conversion.
T. Tsuchiya, J. Kurita and H. Kojima, J. Chem. Soc., Chem. Commun., 1980, 444 DOI: 10.1039/C39800000444
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