Polystyrene-supported basic dicationic ionic liquid as a novel, reusable, and efficient heterogeneous catalyst for the one-pot synthesis of chromene derivatives in water

Abstract

Polystyrene-supported 1,4-bis(3-methylimidazolium-1-yl)butane dihydroxide basic dicationic ionic liquid was prepared by supporting the ionic liquid onto highly cross-linked chloromethylated polystyrene. FT-IR, SEM, TG–DTA, and elemental analysis were employed to characterize the structure and property of the catalyst. The results suggested that our basic dicationic ionic liquid was supported on the surface of PS-CH2Cl by a covalent bond. This basic dicationic ionic liquid exhibited high catalytic activity for the one-pot synthesis of chromene derivatives in water. The unique features of the catalyst, such as high thermal stability, recyclability, excellent catalytic activity in terms of yield and reaction time, high turnover number and turnover frequency, and also using water as a solvent, would be potentially important for its applications in industry.