2026, Vol. 7, Issue 1, Part A

A new 1-hexyl, 3-butane sulfonate benzimidazolium ionic liquid combined with Lewis acid facilitates a novel catalyst for the synthesis of chromeno[4,3-b]chromene derivatives. Chromene derivatives were prepared through the multicomponent reaction among Aromatic aldehydes, 4-hydroxy coumarin and 1,3-dicarbonyl compounds in acetonitrile solvent at 70℃. The significant advantages of this new method include low reaction time, easy work-up, cost-effective, wide substrate scope, excellent yield, and complete atom economy of the final products. Moreover, the prepared catalyst could be frequently recovered many times with only a little decrease in the catalytic activity. The structures of the LAHBimILSC and synthesized chromeno[4,3-b]chromene derivatives investigated by using spectral data (UV-Vis, IR, NMR and mass spectra).