In this research NS-C4(DABCO-SO3H)2)·4Cl as a new nano sized N-sulfonic acid was prepared and characterized using different types of methods including FT-IR, 1H NMR, 13C NMR, mass, XRD, TGA, SEM and AFM analysis.

Nanoporous TiO2 modified with an ionic liquid was used for efficient coupling of amines, 1,2-phenylene diamines, 2-aminophenol and 2-aminothiophenol with orthoesters.

In this work, O-sulfonated poly(vinylpyrrolidonium) hydrogen sulphate has been prepared as a powerful recyclable solid acid catalyst and characterized using a variety of techniques including elemental analysis, FT-IR, TGA, SEM, XRD, pH analysis and Hammett acidity function.

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Coumarin is a bio‐organic compound which exists in some plants. Coumarin by its own or its derivatives are important compounds in the medicinal chemistry, agrochemistry fragrance and food chemistry. Bis(4‐hydroxycoumarin) derivatives are the most famous species of these compounds. Also, pyrano[3,2‐c]chromene‐3‐carbonitrile derivatives which contain a moiety of 4‐hydroxycoumarin have a wide range of biological activities. Taurine, the semi‐essential β‐amino acid in the organs of living creatures especially human and animals, is used as a green bio‐organic catalyst to promote the formation of biscoumarin and pyrano[3,2‐c]chromene‐3‐carbonitrile derivatives via a Knoevenagel‐Micheal reaction in aqueous media. Using this method, the requested products are obtained in high yields during acceptable reaction times and the catalyst can be recycled with high efficiency. In fact, in this study, a bio‐organic reagent is used as the catalyst to promote the synthesis of bioactive compounds in the greenest conditions possible.