Abstract
Synthesis of 5,5’-biindole was carried out by the Madelung indole reaction. Under strong basic conditions and high temperatures (350 ºC), N,N’-bis-formyl-o-tolidine underwent cyclization to produce high amounts of the dimeric indole. Full and unambiguous assignments of all1H-and13 C-NMR resonances of indole and 5,5’-biindole in DMSO-d6 are also reported.
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Quintanilla-Licea, R., Colunga-Valladares, J. F., Caballero-Quintero, A., Waksman, N., Gomez-Flores, R., Rodríguez-Padilla, C., & Tamez-Guerra, R. (2006). 5,5’-biindole. MolBank, 2006(2). https://doi.org/10.3390/M474
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