The trans-adduct 8 derived from indene and N, N-dichlorourethane serves as a precursor for the cis-1, 2-diaminoindane 6 and the trans-diamines 7 and 14. Conversion of 6 and 14 into the triazabenzocycloheptafluorenes 1 and 2, respectively, via the indenopyrazines 4 and 5 is described.
B. S. Orlek and D. Lightowler, J. Chem. Soc., Perkin Trans. 1, 1993, 1307 DOI: 10.1039/P19930001307
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