The π-carbocation reactive species generated by decomposition of 2-(4-azidophenyl)benzothiazoles in trifluoromethanesulfonic acid undergo intermolecular C–C or N–N coupling to afford benzothiazole-substituted 2,2′-diaminobiphenyls.
M. A. Castro and M. F. G. Stevens, J. Chem. Soc., Chem. Commun., 1992, 869 DOI: 10.1039/C39920000869
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