ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Synthesis and properties of novel reusable nano-ordered KIT-5-N-sulfamic acid as a heterogeneous catalyst for solvent-free synthesis of 2,4,5-triaryl-1 H-imidazoles

Razieh Mirsafaei, Majid M. Heravi, Shervin Ahmadi, and Tayebeh Hosseinnejad

^aDepartment of Chemistry, Yazd Branch, Islamic Azad University, Yazd, 89168-71967, Iran

E-mail: mmh1331@yahoo.com

Abstract: A novel silica-bonded propyl-N-sulfamic acid nanocatalyst (NHSO₃H-KIT-5) supported on modified silica mesopore KIT-5 as an organic-inorganic hybrid with high specific surface area was successfully prepared. The 3-aminopropyltriethoxysilane (APTES) on KIT-5 was reacted with chlorosulfonic acid and accurately characterized by the FT-IR, XRD, SEM, EDAXS, and TGA techniques. This heterogeneous and recyclable catalyst catalyzed one pot, multicomponent condensation of benzil, aromatic aldehydes, and ammonium acetate in the presences of 0.05 g of nanocatalyst under solvent-free conditions to afford triaryl-imidazoles in excellent yields. This catalyst showed high catalytic activity under green conditions. This reaction was performed under open air conditions and required no special reaction conditions or chromatographic separation for purification.

Keywords: KIT-5 nanosilica – heterogeneous catalysis – solvent-free conditions – organic-inorganic hybrids – density functional theory – quantum theory of atoms in molecules

Full paper is available at www.springerlink.com.

DOI: 10.1515/chempap-2015-0228

Chemical Papers 70 (4) 418–429 (2016)