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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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Figure

Fig. 1 SEM image of resin sevelamer (a) and resin S‑SO3H (b). a sevelamer before supported by  ClSO3H, b sevelamer after supported by  ClSO3H
Fig. 3 TGA of resin sevelamer and resin S‑SO3H
Table 1 Temperature and catalyst amount for the synthesis of 1,8-dioxo-octahydroxanthene
Table 2 Substrate scope of reaction between various aromatic aldehydes and cyclohexanedione

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