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[1]Benzothieno[3,2-c]cinnoline (1) and some of its derivatives are obtained (55–75% yields) when aqueous solutions of the diazonium chlorides derived from 2-(o-aminophenyl)benzo[b]thiophens are kept at room temperature. A number of reactions of compound (1) are reported.
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Chippendale et al. (1972) studied this question.
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