Bromination of benzo[c]cinnoline with bromine in sulphuric acid, in the presence of silver sulphate, gives 4-bromobenzo[c]cinnoline and not the 1 -isomer. In the synthesis of the latter, a small yield of dinitrobiphenylene has been isolated from an Ullmann reaction on 3-bromo-2-iodonitrobenzene.
J. F. Corbett, J. Chem. Soc. C, 1967, 1638 DOI: 10.1039/J39670001638
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