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Sulfonic acid-functionalized polyallylamine (sevelamer) as an efficient reusable strong solid acid catalyst for the synthesis of xanthenes derivatives

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Sevelamer (polyallyamine resin)-supported sulfonic acid (S-SO3H) has been prepared from the reaction of sevelamer with chlorosulfonic acid and characterized using FT-IR spectroscopy, scanning electronmicroscopy (SEM) and ther‑ mogravimetric analysis (TGA). | Sulfonic acid-functionalized polyallylamine sevelamer as an efficient reusable strong solid acid catalyst for the synthesis of xanthenes derivatives