Condensation of indoles with carbonyl compounds in the presence of montmorillonite clay produces bis(indol-3-yl)methanes in good yield; an extension of this procedure, involving nucleophilic ring opening of oxiranes, produces 1,2-bis(indol-3-yl)ethanes.
A. Krishna Maiti and P. Bhattacharyya, J. Chem. Res. (S), 1997, 424 DOI: 10.1039/A701355H
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