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Symmetrical and unsymmetrical 3,3-di(aryl)indolin-2-ones have been synthesized by nano-SiO 2  as green, heterogeneous, and reusable catalyst under solvent-free conditions at room temperature  via  magnetic stirring and grinding methods. A plausible mechanism of condensation has also been presented.

zeitschrift für naturforschung b

Nano-SiO 2 : a heterogeneous and reusable catalyst for the one-pot synthesis of symmetrical and unsymmetrical 3,3-di(aryl)indolin-2-ones under solvent-free conditions