Summary.
Antimony sulfate was found to be on effective catalyst for the condensation reaction of indoles with carbonyl compounds at room temperature. This catalyst is inexpensive, easily available and it was also found that this catalyst could be recovered quantitatively and reused without much loss of catalytic activity.
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Srinivasa, A., Prabhakar Varma, P., Hulikal, V. et al. Antimony(III) Sulfate Catalyzed Condensation Reaction of Indoles with Carbonyl Compounds. Monatsh Chem 139, 111–115 (2008). https://doi.org/10.1007/s00706-007-0697-z
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DOI: https://doi.org/10.1007/s00706-007-0697-z