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Zirconium(IV) chloride is found to be an efficient catalyst for the electrophilic addition reaction of indole with aldehydes/ketones to afford the corresponding bis(indolyl methanes in good yields. The remarkable features of this new procedure are high conversions, shorter reaction times, cleaner reaction profiles and simple experimental and work-up procedures.

Zirconium(IV) Chloride - Catalysed Reaction of Indoles: An Expeditious Synthesis of Bis(indolyl)methanes