Silica-Grafted Ionic Liquids as Recyclable Catalysts for the Synthesis of 3,4-Dihydropyrano[c]chromenes and Pyra-no[2,3-c]pyrazoles — Oak Academic Publishing
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Silica-Grafted Ionic Liquids as Recyclable Catalysts for the Synthesis of 3,4-Dihydropyrano[c]chromenes and Pyra-no[2,3-c]pyrazoles
Department of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr, Iran
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Department of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr, Iran
1 Department of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr, Iran
2 Department of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr, Iran
Silica-grafted N -propyl-imidazolium hydrogen sulfate ([Sipim]HSO 4 ) is employed as a recyclable heterogeneous ionic liquid catalyst for the synthesis of 3,4-dihydropyrano[c]-chromenes by the reaction of aromatic aldehydes, malononitrile and 4-hydroxycoumarin at 100° C under solvent-free conditions. Also, heterogeneous ionic liquid catalyst was used for the synthesis of pyrano[2,3-c]-pyrazoles by the reaction of aromatic aldehydes, malononitrile and 3-methyl-l-phenyl- 5-pyrazolone at 110° C under solvent-free conditions. The heterogeneous ionic liquid showed much the same efficiency when used in consecutive reaction runs .
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