Novel acidic ionic liquids mediated zinc chloride: Highly effective catalysts for the Beckmann rearrangement

A mild, efficient, and eco-friendly procedure for Beckmann rearrangement was catalyzed by a series of novel Brønsted acidic ionic liquids (ILs) consisiting double –SO3H cations mediated zinc chloride (ILs–ZnCl2) catalytic system. High yields of amides were achieved by using 5 mol.% of ILs–ZnCl2 catalysts. In addition, the catalyst system could be recycled and reused for three times.