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1-benzyl-3-methyl imidazolium hydrogen sulphate [bnmim] [HSO 4 ] was found to be an effective catalyst for the condensation reaction of indoles and derivatives with benzaldehydes in microwave irradiation with lower reaction time and higher yields to give bis(indolyl) methanes.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

Imidazole derivatives R 0190An Efficient Synthesis of 2,4,5-Triaryl-1H-imidazole Derivatives Catalyzed by Boric Acid in Aqueous Media under Ultrasound-Irradiation. -Advantages of the title method are the green catalyst, mild reaction conditions, fast reaction and excellent yields. -(SHELKE, K. F.; SAPKAL, S. B.; SONAR, S. S.; MADJE, B. R.; SHINGATE, B. B.; SHINGARE*, M. S.; Bull. Korean Chem.

Bis(indolyl)methanes were synthesized from indole and aldehydes under solvent-free conditions using cellulose sulfuric acid (CSA) as a catalyst at room temperature. CSA is easily prepared and it was also found that this catalyst could be recovered quantitatively and reused without much loss of catalytic activity.