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General synthetic route to access chloro and bromo cNDIs. (a) Cl2 (g), y = 36–38%; (b) KOH/EtOH, y = 96–97%; (c) HNO3 y = 32–45%; (d) HNO3/H2SO4, y = 45–50%; (e) oleum, 100 °C, y = 25%; (f) DBI, oleum, RT, y = 80%; (g) excess DBI, oleum, RT, y = 93%.
