A comparison of organic and inorganic-supports for –SO۳H functionalityand their application in known reaction

Sulfonation is a major industrial chemical process used to make a diverse range of products,including dyes and color intensifiers, pigments, medicinals,organic intermediates. Sulfonatedaromatic rings have been shown to be promising materials for proton exchange membranes(PEM) due to their high thermal and chemical stability as well as lower-cost productioncompared to commercial available perfluoro sulfonated. for example, Para-toluene sulfonic acidis a typical intermediary for the synthesis of pharmaceuticals, pesticides, and dyes and is acatalyst for organic synthesis[۱]. Sulfonation of narrow polydispersity polystyrene, standardsremains the method of choice for generating polystyrene sulfonate (SPS), samples with definedcomposition[۲]. In the presenet study, γ-alumina and polystyrene foam were used as support for–SO۳H functional groups. The sulfonated products were charactrized by FT-IR, TGA and ۱HNMR. Eficiently of the above mentioned, solid acid was evaluated in condensation of indolesand aldehydes as a model reaction, under mild conditions. Satisfactory yields of the desiredproducts were obtained.