A simple and expeditious nickel (ii) ferrite catalyzed green synthesis of alkyl and aryl bis (indolyl) methane under solvent free microwave condition

NiFe2O4 as an efficient, recyclable and eco-benign heterogeneous catalyst has been investigated for green and expeditious synthesis of alkyl and aryl bis(indolyl)methane under solvent free microwave condition in good to excellent yields. Magnetic NiFe2O4 nano particles can be recovered by external magnet and reused for five times without appreciable change in catalytic activity. Advantages of present protocol includes shorter reaction time, no use of hazardous solvent, cleaner work up, high yields and reusability of catalyst thus making this approach environmentally more acceptable and applicable in the field of green synthesis.