Facile Synthesis of Bis(indolyl)methanes Using LaCl3·7H2O as a Mild and Efficient Catalyst in Molten Salt Media.

Efficient electrophilic substitution reaction of indole with various carbonyl compounds were carried out using a catalytic amount of LaCl3 7H2O in molten tetraethylammonium chloride as an ionic liquid to afford the corresponding bis(indolyl)methanes in excellent yields.

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