Department of Chemistry;
Faculty of Sciences;
Persian Gulf University;
Bushehr;
Iran;
Silica-Grafted; N-Propyl-Imidazolium; Hydrogen; Sulfate; Aldehydes; Pyrano2; 3-c-Pyrazoles; 3; 4-Dihydropyranoc-Chromenes; Solvent-Free; Heterogeneous; Ionic; Liquid; Catalysts;