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The preparation, characterization, and catalytic investigation of NiFe 2 O 4 @SiO 2  grafted 3-(propyl azanediyl)bis(ethane-2,1-diyl) bis(hydrogen sulfate) nanoparticles  (A)  is described. The catalyst was characterized by FT-IR, XRD, FE-SEM, and DLS techniques. The main particle size by the DLS technique was determined as 52 nm. The catalyst was found to be efficient for the condensation of 9-methyl-9H-carbazol-3-amine, thioglycolic acid, and aldehydes lead to the formation of 3-(9-methyl-9H-carbazol-3-yl)-2-arylthiazolidin-4-one derivatives ( 1d-11d)  under reflux in DMF DMF (Time: 1–2 h; Yields: 76–98%) and ultrasonic irradiation in DMF (Time: 0.8–1 h; Yields: 85–97%). The effect of solvent, temperature, and catalyst dosage on the reaction was studied. The catalyst can be recovered and reused 11 times.

polycyclic aromatic compounds

Access to a Library of 3-(9-Methyl-9H-Carbazol-3-yl)-2-Arylthiazolidin-4-One Derivatives Using NiFe 2 O 4 @SiO 2  Grafted Alkyl Sulfonic Acid as an Efficient Catalyst