Abstract
Some halogen-free acyclic task-specific ionic liquids (TSILs) were synthesized as cheap and recyclable catalysts for synthesis of 1,8-dioxo-octahydroxanthenes in water. This methodology offers several advantages, such as good yields, short reaction times, simple procedure, and mild conditions. The products could simply be separated from the catalyst/water, and the catalyst could be reused at least six times without noticeably decreasing the catalytic activity.
Graphical Abstract
Some recyclable acyclic SO3H-functionalized ionic liquids have been used as catalysts for the synthesis of 1,8-dioxo-octahydroxanthenes. The products could simply be separated from the catalyst/water, and the catalyst could be reused at least six times without noticeably decreasing the catalytic activity.
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Acknowledgments
This work was financially supported by the Educational Commission of Jiangsu Provinces (07KJD530238), Nanjing University of Science & Technology, (No. 2006001), and Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources & Environmental Protection (JLCBE 07020).
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Fang, D., Gong, K. & Liu, ZL. Synthesis of 1,8-Dioxo-octahydroxanthenes Catalyzed by Acidic Ionic Liquids in Aqueous Media. Catal Lett 127, 291–295 (2009). https://doi.org/10.1007/s10562-008-9677-0
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DOI: https://doi.org/10.1007/s10562-008-9677-0