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Abstract
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Nowadays, ionically tagged polymers including cations such as imidazolium, pyrrolidonium, pyridinium and anions such as tetrafluoroborate, hexafluorophosphate, triflates incorrectly have been called polymeric ionic liquids PILs [1] .Organic and biological based solid acids are one of the most applicable compounds which have been used for acid-promoted processes and chemical methodologies. Solid acids have received great attention as general materials for a variety of chemical processes because of their reasonable properties such as nonmetallic, nontoxic, with no generated hazardous waste, reusability and high turnover [2]. Recently, application of solid acids with sulfonic acids tags as catalysts comprehensively reviewed [3]. The research and application of various multi-SO3H functionalized solid acids are interesting due to their nano structures, Brønsted acidic and environmentally friendly, good candidates for replacing of conventional solid acids, which could be used as a catalyst and reagent [5]. Spiro compounds as drug candidates are target molecules for pharmaceutical investigations. The unpleasant effects of oxidative stress on human health have become a serious issue. Herein, a novel ionically tagged polymer was synthesized and used as an efficient and reusable catalyst for the synthesis of spiropyran derivatives
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