OICC Press Journal of Nanostructure in Chemistry 2193-8865 7 2 (June 2017) 2017 05 22 Ionic liquid attached to colloidal silica nanoparticles: as high performance catalyst for the preparation of dihydrofurans under microwave irradiation 10.1007/s40097-017-0228-3 EN Javad Safaei-Ghomi Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, IR Hossein Shahbazi-Alavi Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, IR Young Researchers and Elite Club, Islamic Azad University, Kashan, IR Seyed Hadi Nazemzadeh Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, IR Journal Article 2017 05 22 Abstract The preparation of trans -dihydrofurans has been achieved by a one-pot condensation reaction of 4-bromophenacyl bromide, aromatic aldehydes and 5,5-dimethyl-1,3-cyclohexanedione using bis (1(3-trimethoxysilylpropyl)-3-methyl-imidazolium) copper tetrachloride tethered to colloidal silica nanoparticles under microwave irradiation. Ionic liquid tethered to colloidal silica nanoparticles have been characterized by H NMR spectroscopy, scanning electron microscope, energy dispersive spectroscopy, thermogravimetric analysis and dynamic light scattering.