Electrophilic bromination and chlorination of benzo[c]cinnoline in sulphuric acid give mixtures of 1-and 4-halogenobenzo[c]cinnolines, then 1,4-dihalogenobenzo[c]cinnolines. The 1H n.m.r. spectra of the monobromobenzo[c]cinnolines have been analysed and previous assignments made for the parent benzo[c]cinnoline are corrected.
J. W. Barton and D. J. Lapham, J. Chem. Soc., Perkin Trans. 1, 1979, 1503 DOI: 10.1039/P19790001503
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