Iranian Journal of Catalysis (IJC) Imidazolium Hydrogen Sulphate Supported on Copper Oxide Nanoparticles as an efficient simple Heterogeneous Acidic Catalyst for Multi-component Synthesis of 1, 4- dihydro Pyrano [2, 3-c] pyrazoles Derivatives Volume 11 (2021) IJC Issue 2, June 2021 2024 01 19 Imidazolium Hydrogen Sulphate Supported on Copper Oxide Nanoparticles as an efficient simple Heterogeneous Acidic Catalyst for Multi-component Synthesis of 1, 4- dihydro Pyrano [2, 3-c] pyrazoles Derivatives EN Elham Fadavipoor Department of Chemistry, Sousangerd Branch, Islamic Azad University, Sousangerd, Iran Rashid Badri Department of Chemistry, College of Science, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran Journal Article 2024 01 19 Si-Im/HSO4(1-methyl-3-(3-(trimethoxysilyl) propyl) imidazolium hydrogen sulphate functionalized Copper oxide nanoparticles(CuO NPs )as a novel supporting ionic liquid was prepared and characterized by FT-IR spectroscopy, FE-SEM, XRD, TGA, and EDX techniques. It was used as a recyclable catalyst for the one-pot, three-component synthesis of 1, 4- dihydro Pyrano [2, 3-c] pyrazoles derivatives. The results showed that the catalyst was very efficient, and in addition, at the end of the reaction the catalyst could be easily isolated and reused for the next reaction without any appreciable loss of its catalytic activity. The reused catalyst was also characterized by the FE-SEM and EDX techniques.