Homoselective synthesis of tetrazole derivatives using copper complex anchored on mesoporous KIT‐6 as a reusable, highly efficient, and environmentally green nanocatalyst

In this article, the mesoporous silica framework of KIT‐6 was synthesized and, then its surface was modified using 3‐aminopropyltrimethoxysilane (APTMS). The new KIT‐6@DABP@Cu nanocatalyst was then prepared by anchoring the copper complex on modified mesoporous KIT‐6. The nanocatalyst was identified using several techniques, including FT‐IR, WDX, AAS, SEM, TGA, XRD, EDS, and BET. The physical properties, such as size, shape, and morphology of the nanocatalyst were studied by SEM analysis. The elemental composition of KIT‐6@DABP@Cu nanocatalyst was described using wavelength dispersive X‐ray spectroscopy (WDX) and EDS. FT‐IR spectroscopy was used to characterize the functional groups in the structure of the nanoparticles. The stability of KIT‐6@DABP@Cu nanocatalyst was studied by TGA at high temperatures. Also, the surface area, total volume, and average diameter of pores of the nanocatalyst were determined using Brunauer–Emmett–Teller (BET) analysis. The KIT‐6@DABP@Cu catalyst was found to be a new, highly effective, and green catalyst for the synthesizing of 5‐substituted‐tetrazoles using nitriles and sodium azide (NaN3) catalyzed in polyethyleneglycol‐400 (PEG‐400) as a green solvent. This heterogeneous catalyst showed good recyclability for up to five consecutive cycles without notable loss of its catalytic efficiency. The mesoporous KIT‐6 was modified using 3,4‐diaminobenzophenone, and further, a new complex of copper was immobilized on its surface (KIT‐6@DABP@Cu) as an organometallic and nanocatalyst in the selective synthesis of 5‐substituted tetrazoles. This catalyst was identified with FT‐IR, WDX, AAS, XRD, SEM, TGA, EDX, and BET techniques. KIT‐6@DABP@Cu nanocatalyst was demonstrated highly effective and good reusability in the synthesis of 5‐substituted tetrazoles.