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Piperazinium nano silica sulfonate (PNSS) is simply prepared by the reaction of piperazine with nano sized silica sulfuric acid. After preparation it was completely characterized using different techniques including FT-IR, XRD, TGA, FESEM, EDS and TEM analysis. In continue PNSS was efficiently used for the promotion of the synthesis of polyhydroquinolines and 1,8-dioxo-decahydroacridines through unsymmetrical and symmetrical Hantzsch condensation reaction. High yields, short reaction times, ease of preparation and reusability of the catalyst, easy work-up procedure and solvent-free conditions are among the most important advantages of this method.

A green approach for the promotion of the synthesis of Hantzsch products using poly(vinylpyrrolidinium) perchlorate {[PVPH]ClO 4 } as a new modified polymeric catalyst in the absence of solvent is reported. The title catalyst is easily prepared and characterized using a variety of techniques including infrared spectra, X-ray diffraction, thermal gravimetric analysis, scanning electron microscopy, pH analysis, and Hammett acidity function. Some of the advantages of this novel synthetic method are: easy preparation of the catalyst, short reaction times, high to excellent yields of the products, simple and easy work-up procedure, and reusability of the catalyst.

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