Synthesis and characterization of 4-methyl-1-(3-sulfopropyl)pyridinium hydrogen sulfate as a new ionic liquid immobilized on silica nanoparticles: A recyclable nanocomposite ionic liquid for the production of various substituted phthalazine-ones

A new acidic ionic liquid, 4-methyl-1-(3-sulfopropyl)pyridinium hydrogen sulfate ([MSPP][HSO4]) was prepared and immobilized on silica nanoparticles to afforded heterogeneous acidic ionic liquid ([MSPP]HSO4@nSiO2). The efficiency of this catalyst was investigated for one-pot synthesis of various phthalazine-ones in solvent-free condition.238