Nickel ferrite nanoparticles: an efficient and reusable nanocatalyst for a neat, one-pot and four-component synthesis of pyrroles

We applied magnetic NiFe 2 O 4 as a recoverable catalyst in the multicomponent reaction of substituted pyrroles. Magnetic NiFe 2 O 4 could be recovered from the reaction easily with an external magnet and reused nine times without significant activity loss. The yields are high.