Tasqeeruddin, S. et al. 2020. Ammonium Chloride: An Efficient and Environmentally benign Catalyst for Knoevenagel Condensation of Carbonyl and Active Methylene Compounds. Asian Journal of Chemistry. 32, 12 (Dec. 2020), 3024–3028. DOI:https://doi.org/10.14233/ajchem.2020.22879.