Under the appropriate conditions the reaction between benzoylacetone and ethylenediamine may give rise to 2,3-dihydro-5-methyl-7-phenyldiazepine (or a salt), 1,2-di-(2-benzoyl-1-methylvinylamino)ethane, or 1,2-di-(1-phenylethylideneamino)ethane. The second of these products is converted into the diazepine when heated in acetic acid.
A. M. Gorringe, D. Lloyd and D. R. Marshall, J. Chem. Soc. C, 1967, 2340 DOI: 10.1039/J39670002340
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