Synthesis of 14-Aryl-and Alkyl-14H-dibenzo[a,j]xanthenes Catalyzed by Silica--Supported Ferric Hydrogensulfate. -Silica-supported ferric hydrogensulfate is used as solid acid catalyst for the synthesis of several novel fused xanthenes (III). The catalyst is reusable. -(ESHGHI*, H.; BAKAVOLI, M.; MORADI, H.; Org. Prep. Proced. Int. 43 (2011) 3, 302-307, http://dx.