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An efficient synthesis of bis(indolyl)methanes through Fe III ‐catalyzed electrophilic substitution reactions of indoles with various aldehydes in ionic liquid is described. It was found that the ionic liquids involving FeCl 3 ·6H 2 O were the most efficient catalytic systems, and could be simply recycled without significant loss of activity. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
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Ji et al. (2004) studied this question.
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