S. Ajaikumar, A. Pandurangan, Esterification of alkyl acids with alkanols over MCM-41 molecular sieves: Influence of hydrophobic surface on condensation reaction, J. Mol. Catal. A-Chem. 266 (2007) 1-10.
 A. Ross, Industrial Applications of Organotin Compounds, Ann. N.Y. Acad. Sci. 125 (1965) 107-123.
 A. Mobaraki, B. Movassagh, B. Karimi, Magnetic solid sulfonic acid decorated with hydrophobic regulators: A combinatorial and magnetically separable catalyst for the synthesis of α-aminonitriles, ACS Comb. Sci. 16 (2014) 352-358.
 S. Rostamnia, A. Nuri, H. Xin, A. Pourjavadi, S.H. Hosseini, Water dispersed magnetic nanoparticles (H2O-DMNPs) of γ-Fe2O3 for multicomponent coupling reactions: a green, single-pot technique for the synthesis of tetrahydro-4H-chromenes and hexahydroquinoline carboxylates, Tetrahedron Lett. 54 (2013) 3344-3347.
 Y. Li, T. Leng, H. Lin, C. Deng, X. Xu, N. Yao, P. Yang, X. Zhang, Preparation of Fe3O4@ZrO2 core-shell microspheres as affinity probes for selective enrichment and direct determination of phosphopeptides using matrix-assisted laser
desorption ionization mass spectrometry, J. Proteome Res. 6 (2007) 4498-4510.
 Y. Mansoori, F.S. Tataroglu, M. Sadaghian, Esterification of carboxylic acids by tributyl borate under solvent- and catalyst-free conditions, Green Chem. 7 (2005) 870-873.
 Y. Mansoori, F. Tataroglu Seyidov, S. Bohlooli, M.R. Zamanloo, G.H. Imanzadeh, Esterification of carboxylic acids and diacids by trialkyl borate under solvent- and catalyst-free conditions, Chinese J. Chem. 25 (2007) 1878-1882.
 M. A. Zolfigol, Silica sulfuric acid/NaNO2 as a novel heterogeneous system for production of thionitrites and disulfides under mild conditions, Tetrahedron, 57 (2001) 9509-9511.
 S.T. Firdovsi, M. Yagoub, A.E. Parvin, Transesterification reaction of dimethyl terephthalateby 2-ethylhexanol in the presence of heterogeneous catalysts under solvent-free condition, Chinese J. Chem. 25 (2007) 246-249.
 K. Saravanan, B. Tyagi, H.C. Bajaj, Sulfated zirconia: an efficient solid acid catalyst for esterification of myristic acid with short chain alcohols, Catal. Sci. Technol. 2 (2012) 2512-2520.
 A.P. Kumar, J.H. Kim, T.D. Thanh, Y.-I. Lee, Chiral zirconia magnetic microspheres as a new recyclable selector for the discrimination of racemic drugs, J. Mater. Chem. B, 1 (2013) 4909-4915.
 N.E. Leadbeater, M. Marco, Preparation of polymer-supported ligands and metal complexes for use in catalysis, Chem. Rev. 102 (2002) 3217-3274.
 A. Mobaraki, B. Movassagh, B. Karimi, Hydrophobicity-enhanced magnetic solid sulfonic acid: A simple approach to improve the mass transfer of reaction partners on the surface of the heterogeneous catalyst in water-generating reactions, Appl. Catal. A, 472 (2014) 123-133.
 C. Gómez-Polo, A. Gil, S.A. Korili, J.I. Pérez-Landázabal, V. Recarte, R. Trujillano, M.A. Vicente, Effect of the metal support interactions on the physicochemical and magnetic properties of Ni catalysts, J. Magn. Magn. Mater. 316 (2007) e783-e786.
 M.B. Gawande, A.K. Rathi, I.D. Nogueira, R.S. Varma, P.S. Branco, Magnetite-supported sulfonic acid: a retrievable nanocatalyst for the Ritter reaction and multicomponent reactions, Green Chem. 15 (2013) 1895-1899.
 Z. Wang, D. Wu, G. Wu, N. Yang, A. Wu, Modifying Fe3O4 microspheres with rhodamine hydrazide for selective detection and removal of Hg2+ ion in water, J. Hazard. Mater. 244-245 (2013) 621-627.
 I. Chourpa, L. Douziech-Eyrolles, L. Ngaboni-Okassa, J.-F. Fouquenet, S. Cohen-Jonathan, M. Souce, H. Marchais, P. Dubois, Molecular composition of iron oxide nanoparticles, precursors for magnetic drug targeting, as characterized by confocal Raman microspectroscopy, Analyst, 130 (2005) 1395-1403.
 M. Shokouhimehr, Y. Piao, J. Kim, Y. Jang, T. Hyeon, A magnetically recyclable nanocomposite catalyst for olefin epoxidation, Angew. Chem. Int. Edit. 46 (2007) 7039-7043.
 S. Laurent, D. Forge, M. Port, A. Roch, C. Robic, L. Vander Elst, R.N. Muller, Magnetic iron oxide nanoparticles: Synthesis, stabilization, vectorization, physicochemical characterizations, and biological applications, Chem. Rev. 108 (2008) 2064-2110.
 V.V. Costa, M.J. Jacinto, L.M. Rossi, R. Landers, E.V. Gusevskaya, Aerobic oxidation of monoterpenic alcohols catalyzed by ruthenium hydroxide supported on silica-coated magnetic nanoparticles, J. Catal. 282 (2011) 209-214.
 F. Nemati, M.M. Heravi, R. Saeedi Rad, Nano-Fe3O4 encapsulated-silica particles bearing sulfonic acid goups as a magnetically separable catalyst for highly efficient Knoevenagel condensation and Michael addition reactions of aromatic aldehydes with 1,3-cyclic diketones, Chinese J. Catal. 33 (2012) 1825-1831.
 H. Naeimi, Z. Nazifi, A highly efficient nano-Fe3O4 encapsulated-silica particles bearing sulfonic acid groups as a solid acid catalyst for synthesis of 1,8-dioxo-octahydroxanthene derivatives, J. Nanopart. Res. 15 (2013) 1-11.
 H. Naeimi, S. Mohamadabadi, Sulfonic acidfunctionalized silica-coated magnetic nanoparticles as an efficient reusable catalyst for the synthesis of 1-substituted 1H-tetrazoles under solvent-free conditions, Dalton T. 43 (2014) 12967-12973.
 J. Safari, Z. Zarnegar, A magnetic nanoparticlesupported sulfuric acid as a highly efficient and reusable catalyst for rapid synthesis of amidoalkyl naphthols, J. Mol. Catal. A-Chem. 379 (2013) 269-276.
 A.R. Kiasat, J. Davarpanah, Fe3O4@silica sulfuric acid nanoparticles: An efficient reusable nanomagnetic catalyst as potent solid acid for one-pot solvent-free synthesis of indazolo[2,1-b]phthalazinetriones and pyrazolo[1,2-b]phthalazine-diones, J. Mol. Catal. A-Chem. 373 (2013) 46-54.
 A. Khorshidi, S. Shariati, Sulfuric acid functionalized MCM-41 coated on magnetite nanoparticles as a recyclable core-shell solid acid catalyst for threecomponent condensation of indoles, aldehydes and thiols, RSC Adv. 4 (2014) 41469-41475.
 W.L.F. Armarego, C.L.L. Chai, Purification of laboratory chemicals, 6th ed., Butterworth-Heinemann, Elsevier Inc., Burlington, 2009.
 W. Stöber, A. Fink, E. Bohn, Controlled growth of monodisperse silica spheres in the micron size range, J. Colloid Interf. Sci. 26 (1968) 62-69.
 F.T. Sejidov, Y. Mansoori, N. Goodarzi, Esterification reaction using solid heterogeneous acid catalysts under solvent-less condition, J. Mol. Catal. A-Chem. 240 (2005) 186-190.
 J.D. Hanawalt, H.W. Rinn, L.K. Frevel, Chemical analysis by x-ray diffraction, Ind. Eng. Chem. Res. 10 (1938) 457-512.
 A. Guinier, X-ray diffraction: in crystals, imperfect crystals, and amorphous bodies. Courier Dover Publications, New York, 2013.
 A. Amoozadeh, S. Rahmani, M. Bitaraf, F.B. Abadi, E. Tabrizian, Nano-zirconia as an excellent nano support for immobilization of sulfonic acid: a new, efficient and highly recyclable heterogeneous solid acid nanocatalyst for multicomponent reactions, New J. Chem. 40 (2016) 770-780.
 H. Cao, J. He, L. Deng, X. Gao, Fabrication of cyclodextrin-functionalized superparamagnetic Fe3O4/amino-silane core–shell nanoparticles via layer-by-layer method, Appl. Surf. Sci. 255 (2009) 7974-7980.
 M. Pooresmaeil, Y. Mansoori, M. Mirzaeinejad, A.L.I. Khodayari, Efficient removal of methylene blue by novel magnetic hydrogel nanocomposites of poly(acrylic acid), Adv. Polym. Tech. 37 (2016) 262-274.
 J. Choubey, A.K. Bajpai, Investigation on magnetically controlled delivery of doxorubicin from superparamagnetic nanocarriers of gelatin crosslinked with genipin, J. Mater. Sci.-Mater. M. 21 (2010) 1573-1586.
 H. Xing, T. Wang, Z. Zhou, Y. Dai, The sulfonic acid-functionalized ionic liquids with pyridinium cations: Acidities and their acidity-catalytic activity relationships, J. Mol. Catal. A-Chem. 264 (2007) 53-59.
 P. Tayeb Oskoie, Y. Mansoori, Fe3O4@ZrO2- SO3H Nanoparticles: A new magnetically retrievable catalyst for esterification of mono- and dicarboxylic acids, J. Part. Sci. Technol. 4 (2018) 1-12.
 G. Van der Waal, Ester base fluids, Unichem International, Gouda, The Netherlands, 1995.