1-Chlorobenzotriazole is shown to be a convenient and highly efficient reagent for nuclear chlorination of carbazole and several derivatives. Reactions proceed to completion at ambient temperatures, yields are high in all cases, and mono-, di-, and tetra-chlorination occur with equal facility, according to the molar ratio of reagents.
P. M. Bowyer, D. H. Iles and A. Ledwith, J. Chem. Soc. C, 1971, 2775 DOI: 10.1039/J39710002775
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