Oxidation of 10-benzylidene-5-methyl-5,10-dihydroindeno[1,2-b]indole (2) gives the dioxodibenz[b,f]azocine (3), which reacts (probably via a transannular interaction) with hydroxylamine and with ethylamine to give oxa-aza- and diaza-chrysene derivatives (5) and (6); the X-ray crystal structure of (5) is reported.
R. M. Letcher, K. Ng and K. Cheung, J. Chem. Soc., Chem. Commun., 1987, 1602 DOI: 10.1039/C39870001602
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