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J. M. Khurana and S. Kumar, “Tetrabutylammonium Bromide (TBAB): A Neutral and Efficient Catalyst for the Synthesis of Biscoumarin and 3,4-Dihydropyrano[c] chromene Derivatives in Water and Solvent-Free Conditions,” Tetrahedron Letters, Vol. 50, No. 28, 2009, pp. 4125-4127. doi:10.1016/j.tetlet.2009.04.125

has been cited by the following article:

• TITLE: n-Dodecylbenzene Sulfonic Acid (DBSA) as a Novel Brønsted Acid Catalyst for the Synthesis of Bis(indolyl)methanes and Bis(4-hydroxycoumarin-3-yl)methanes in Water

  AUTHORS: Balu Pawar, Vinod Shinde, Atul Chaskar

  KEYWORDS: n-Dodecylbenzene Sulfonic Acid (DBSA); Indole; Aldehyde; Bis(indolyl)methane; Bis(4-hydroxycoumarin-3-yl)methanes

  JOURNAL NAME: Green and Sustainable Chemistry, Vol.3 No.2, May 27, 2013

  ABSTRACT: n-Dodecylbenzene sulfonic acid (DBSA) as a novel, biodegradable, and efficient Br?nsted acid catalyst used for the reaction of indoles/4-hydroxy coumarin with aldehydes to obtain a bis(indolyl)methanes/bis(4-hydroxycoumarin-3-yl)methanes, respectively. The catalyst exhibited remarkable activity, and tolerated a wide variety of functional groups providing the desired bis(indolyl)methanes and bis(4-hydroxycoumarin-3-yl)methanes in good to excellent yield (70%-96%) in water.