Abstract
A novel Brønsted acidic ionic liquid immobilized on modified magnetic lignin (Fe(3)O(4)/MPL-[IL]) was successfully synthesized and comprehensively characterized by FT-IR, XRD, EDX, VSM, FE-SEM, TGA, and TEM analyses. The prepared nanocatalyst was utilized for preparing 2-amino-4-aryl-4H-benzo[f]chromene-3-carbonitriles via the reaction between aryl aldehydes, β-naphthol, and active methylene compounds (malononitrile or ethyl cyanoacetate), affording high yields of 87-97% within short reaction times (20-80 min) under mild conditions. Necessary experiments were conducted for the recyclability test of the prepared catalyst, and the results showed that the Fe(3)O(4)/MPL-[IL] nanocatalyst can be reused five times while maintaining about 95% of its initial catalytic activity, with excellent stability.