A series of macrocyclic tris(indolylmethylene) compounds (calix[3]indoles] can be obtained from 7- or 2-hydroxymethylindoles or from the combination of either an indole with a bis(hydroxymethyl)-2,7′-diindolylmethane or a bis(hydroxymethyl)indole with a 2,7′-diindolylmethane; an isomeric series can be obtained from the combination of an indole with a bis(hydroxymethyl)-2,2′-diindolylmethane.
D. St. C. Black, M. C. Bowyer, N. Kumar and P. S. R. Mitchell, J. Chem. Soc., Chem. Commun., 1993, 819 DOI: 10.1039/C39930000819
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