Abstract
Various supported ionic liquid phase (SILP) catalysts containing hexafluorophosphate anion have been prepared by covalent grafting of imidazolium ionic liquid in the matrix of cellulose, silica and Merrifield resin followed by anion metathesis reaction. The compatibility of SILP catalysts in the synthesis of 1,4-dihydropyridines under ultrasonication is investigated. The results revealed that SILP catalysts can be effectively used under ultrasonication without physical, chemical and structural changes as evidenced from various analytical techniques.
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