Abstract
In the present work, a novel polymer supported Brønsted acidic ionic liquid catalyst is synthesized by functionalization of Merrifield resin with DABCO, 1,4-butane sultone and concentrated H2SO4 is reported. The structure of synthesized catalyst was confirmed by FT-IR, SEM, EDX, XRD, XPS, TGA and DTA techniques. The catalytic efficiency of novel Brønsted acidic [MerDABCO-BSA][HSO4]2 was evaluated in the synthesis of biscoumarins from 4-hydroxycoumarin and aryl aldehydes in ethanol at 80 °C. Also, ortho-aminocarbonitriles were synthesized from cyclohexanone, malononitrile and aromatic aldehydes in ethanol:water (70:30 v/v) under ultrasonic condition. The catalyst exhibits good stability under thermal as well as ultrasonic conditions. The recycled catalyst demonstrated good catalytic efficiency for four cycles without significant deterioration in the catalytic activity. The present protocol offers advantages of operational simplicity, shorter reaction times and higher yields of the products.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call