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Preparation of a novel heterogeneous acidic catalyst by impregnation of alumina support by N-(4-sulfonic acid)butyl triethylammonium hydrogen sulfate ([Et 3 NC 4 SO 3 H][HSO 4 ]), an acidic ionic liquid, and its primary application as a solid acidic supported catalyst in the synthesis of 1,8-dioxo-octahydroxanthenes by reaction of dimedone with aromatic aldehydes are described. Characterization of the catalyst was performed by FT-IR, BET, TG/DTG, and XRD techniques. The results showed that the catalyst has high activity and the desired products were obtained in high yields. Moreover, the recovered catalyst was found to be reusable and a considerable catalytic activity still could be achieved after third run.

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Unique properties of 1,2,3-triazoles on the one hand and necessity of usage of an efficient catalyst with fidelity in principles of green chemistry on the other hand impelled us to design and synthesis of a novel heterogeneous nanocatalyst (Cu@Arg-MWCNTs) with simple synthesis, immense power, high regioselectivity, and easy separation and recyclability. The Cu@Arg-MWCNT structure is characterized by different analyses and used for the synthesis of various triazoles. Its high catalytic activity is confirmed by high yields and short reaction times under mild conditions in click reaction.