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۱Brønsted Acidic Phosphonium Based Ionic Liquid Functionalized SBA–15 [HO3S–PhospIL@SBA–15]: Green, Recyclable, and Efficient Catalyst for the Synthesis of Pyrano[3,2–c]Chromenone Derivatives
اطلاعات انتشار: Iranian Journal of Chemistry and Chemical Engineering (IJCCE)، سي و چهارم،شماره۴(پياپي ۷۶)، ۲۰۱۵، سال
تعداد صفحات: ۷
: The surface of SBA–15 was modified by diphenylphosphine; then, it was treated with butane sultone and sulfuric acid to obtain Brønsted acid HO3S–phosphonium based ionic liquid functionalized SBA–15 with HSO4– as a counteranion. It efficiently catalyzed synthesis of pyrano[3,2–c]chromenone derivatives through the reaction of 4–hydroxycoumarin and chalcones at 60 °C in water\ethanol. Good yields, mild reaction conditions, and user–friendly procedure are advantages of this method. Also, the catalyst could be easily separated and reused five times without significant reduction of activity.
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