The surface of the MCM-41 has been functionalized with 3-chloropropyltrimethoxysilane, which undergoes an SN2 substitution reaction of the chloro group with the nitrogen of ligand (quinoline-2-4-dicarboxylic acid), offering the MCM- 41-quinoline-2-4-dicarboxylic acid (MCM-41-QDC’s). A new recyclable Ni attached functionalized mesoporous MCM-41 (MCM-41-QDC’s-Ni) has been produced through a post-synthetic method. This catalyst displays high catalytic performance in the synthesis of 5-substituted 1H-tetrazoles and the selective oxidation of sulfides. This protocol is a greener way toward the synthesis of 5-substituted 1H-tetrazoles and the selective oxidation of sulfides. The main aspects of this economical Nicatalyzed procedure are green synthesis, slighter experimental conditions, and lesser reaction time with no additives. Further benefits comprise experimental comfort of handling, securer replacement to dangerous, damaging, and poisoning regular Lewis’s acid catalysts. The catalyst can be simply separated by simple recovery and reused for several periods without any remarkable decrease in the catalyst activity and selectivity.
