β-Diketones as well as β-dialdehydes react with 1,2-dianilinoethane to form 2,3-dihydro-1,4-diphenyl-1,4-diazepinium salts. Other NN′-disubstituted ethylenediamines react similarly. The NN′-dihydrodiphenyl-diazepinium salts are stable in acid but not in alkali. Substitution of the diazepinium cation by bromine has been effected.
C. Barnett, H. P. Cleghorn, G. E. Cross, D. Lloyd and D. R. Marshall, J. Chem. Soc. C, 1966, 93 DOI: 10.1039/J39660000093
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