OICC Press Iranian Journal of Catalysis 2345-4865 15 1 2024 11 25 Bicyclic 1,2,3-Triazolium Ionic Liquids as a novel ionic liquid based catalytic systems for the preparation of spirobenzo[f]pyrano[3,2-c]chromene derivatives under ultrasonic irradiation conditions 1 8 10.57647/j.ijc.2025.1501.06 EN Abbas Fazlinia Department of Chemistry, Zarghan Branch, Islamic Azad University, Zarghan, Iran https://orcid.org/0000-0002-2793-4247 Fatemeh Hosna Tavakoli Department of Chemistry, Najafabad Branch, Islamic Azad University, Najafabad, Iran https://orcid.org/0009-0009-9447-6547 Majid Ghashang Department of Chemistry, Najafabad Branch, Islamic Azad University, Najafabad, Iran https://orcid.org/0000-0002-7959-6438 Journal Article 2024 11 25 A novel ionic liquid, 2-butyl-4,5,6,7-tetrahydro-2H-[1,2,3]triazolo[1,5-a]pyridin-8-ium hydrogen sulfate, was synthesized and employed as an efficient catalyst in the high-yield synthesis of spiro compounds featuring the benzo[f]pyrano[3,2-c]chromene scaffold. Through a three-component reaction involving 1-hydroxy-3H-benzo[f]chromen-3-one, malononitrile, and 1-benzylindoline-2,3-dione in ethanol under reflux and ultrasonic irradiation, 10 distinct compounds were successfully obtained in excellent yields ranging from 86% to 97%. The products were characterized comprehensively by Fourier-transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR), and CHN analysis. Notably, the protocol offers an efficient, non-chromatographic method for separation and purification, ensuring high-yield productivity and operational simplicity, making it a highly advantageous approach for synthesizing spiro compounds. Research Highlights Bicyclic 1,2,3-Triazolium Ionic Liquids were prepared and used for the preparation of some spiro compounds. Spiro compounds with the benzo[f]pyrano[3,2-c]chromene moiety were prepared by a three-component reaction. The nonchromatographic separation and purification of the products with high-yield productivity are the salient features of this protocol. All reactions proceed well and the products were formed in high yields.