Summary.
Highly rapid and convenient syntheses of bis(indolyl)methanes in excellent yields were carried out using the inexpensive and easily available catalyst, hexamethylenetetraamine-bromine (HMTAB). Mild reaction conditions, short reaction times, and excellent yields are important features of this method.
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Bandgar, B., Bettigeri, S. & Joshi, N. Hexamethylenetetraamine-Bromine Catalyzed Rapid and Efficient Synthesis of Bis(indolyl)methanes. Monatshefte für Chemie 135, 1265–1273 (2004). https://doi.org/10.1007/PL00021417
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DOI: https://doi.org/10.1007/PL00021417