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 thermogravimetric analysis (TGA). The catalytic activity of S-SO3H was investigated in the synthesis of 1,8-dioxo-octahydroxanthene derivatives. All of the reactions were fast and gave excellent yields. The catalyst was easily recovered and reused for 5 runs without significant loss of its catalytic activity.

中文翻译：

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磺酸功能化聚烯丙胺（司维拉姆）作为有效可重复使用的强固体酸催化剂，用于合成呫吨衍生物

通过司维拉姆与氯磺酸的反应制备了司维拉姆（聚烯丙胺树脂）负载的磺酸（S-SO3H），并使用 FT-IR 光谱、扫描电子显微镜（SEM）和热重分析（TGA）对其进行了表征。研究了S-SO3H在1,8-二氧代-八氢呫吨衍生物合成中的催化活性。所有反应都快速且产率优异。该催化剂很容易回收并重复使用 5 次，其催化活性没有显着损失。