OICC Press Iranian Journal of Catalysis 2345-4865 4 2 2024 02 03 Ammonium monovanadate: a versatile and reusable catalyst for Friedel-Crafts alkylation and Michael addition of indoles EN Kobra Nikoofar Department of Chemistry, Faculty of Physics & Chemistry, Alzahra University, Tehran, Iran Journal Article 2024 02 03 Ammonium monovanadate (NH4VO3) has been devoted as an efficient, commercially available, eco-friendly and reusable catalyst for the synthesis of bis(indolyl)methanes (BIMs), oxindole derivatives and also Michael adducts of indoles at 50 °C under solvent-free conditions. The reusability of this solid acid catalyst in addition with its selectivity has also been examined.