Cu-isatin schiff base complex supported on magnetic nanoparticles as an efficient and recyclable catalyst for the synthesis of bis(indolyl)methanes and bis(pyrazolyl)methanes in aqueous media

摘要

Cu-isatin Schiff base supported on gamma-Fe2O3 as a new catalyst was synthesized and characterized by different methods such as SEM, TEM, XRD, TGA, FT-IR, ICP, VSM and CHN analysis. It was used as a reusable heterogeneous catalyst for the efficient synthesis of bis(indolyl)methanes ( TON = 320-392) and bis( pyrazolyl) methanes ( TON = 340-388) in aqueous media. The catalyst was easily removed from the reaction mixture using an external magnet and reused eight times without any significant loss of its reactivity. (C) 2016 Elsevier B.V. All rights reserved.