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The article focuses on the discovery and improvement of multi-component reactions (MCRs) with recyclable catalysts. Topics include the economic and environmental importance of the design and preparation of recyclable catalysts, the production of magnetic nanoparticles, and the availability of fourteen acidic hydro-gens, high thermal stability and high hydrolytic stability found in Preyssler heteropoly acid.

For the first time, a new water stable Brønsted acidic ionic liquid based on Keggin heteroployacid (HPA) was used as environmentally benign catalytic medium in the esterfication of salicylic acid with aliphatic alcohols, CnH2n+1OH (n = 1-5) and benzylic alcohols, RC6H4CH2OH (R = H, NO2, OCH3). This ionic liquid (IL) afforded excellent yield in both thermal conditions and microwave irradiation. Maximum yields were observed under microwave irradiation. Different reaction runs were conducted by varying the reaction parameters such as molar ratio of reactants, weight of the IL, and reaction period in order to optimize the reaction. The IL was easily recovered and reused many times. No significant loss in catalytic activity was observed on recycling. [ABSTRACT FROM AUTHOR]