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Ferric chloride hexahydrate was used as a recyclable homogeneous catalyst in  aqueous media for the synthesis of 3-(indol-3-yl)-3-hydroxyindolin-2-ones  under sonication. It was found that the employed conditions afford the  products smoothly in good to excellent yields

An ultrasound-promoted green approach for the synthesis of 3-(indol-3-yl)-3-hydroxyindolin-2-ones catalyzed by Fe(III)