Immobilization of cerium (IV) and erbium (III) in mesoporous MCM‐41: Two novel and highly active heterogeneous catalysts for the synthesis of 5‐substituted tetrazoles, and chemo‐ and homoselective oxidation of sulfides

Abstract

Two well‐ordered 2D‐hexagonal cerium (IV) and erbium (III) embedded functionalized mesoporous MCM‐41(MCM‐41@Serine/Ce and MCM‐41@Serine/Er) have been developed via functionalization of mesoporous MCM‐41. The surface modification method has been used in the preparation of serine‐grafted MCM‐41 and led to the development of MCM‐41@Serine. The reaction of MCM‐41@Serine with Ce (NH4)2(NO3)6·2H2O or ErCl3·6H2O in ethanol under reflux led to the organization of MCM‐41@Serine/Ce and MCM‐41@Serine/Er catalysts. The structures of these catalysts were determined using scanning electron microscopy, mapping, energy‐dispersive X‐ray spectroscopy, Fourier transform‐infrared, thermogravimetric analysis, X‐ray diffraction, inductively coupled plasma, and Brunauer–Emmett–Teller analysis. These MCM‐41@Serine/Ce and MCM‐41@Serine/Er catalysts show outstanding catalytic performance in sulfides oxidation and synthesis of 5‐substituted tetrazoles. These catalysts can be recycled for seven repeated reaction runs without showing a considerable decrease in catalytic performance.

Ultrasound-promoted green approach for the synthesis of multisubstituted pyridines using stable and reusable SBA-15@ADMPT/H5PW10V2O40nanocatalyst at room temperature

“…This strategy enabled the scientists to overcome the limitations involved in the recycling and separation of the homogeneous catalysts. Generally, the active homogeneous catalyst is immobilized/anchored on various organic polymers (11,12), supported on inert porous solid materials such as alumina and silica (13)(14)(15), or encapsulated in the cavities and pores of microporous and mesoporous materials such as montmorillonite, zeolites, MCM-48, MCM-41, and SBA-15 (16)(17)(18).…”

Fe3O4@BNPs‐CPTMS‐Chitosan‐Pd(0) as an Efficient and Stable Heterogeneous Magnetic Nanocatalyst for the Chemoselective Oxidation of Alcohols and Homoselective Synthesis of 5‐Subestituted 1H‐Tetrazoles

“…Another term in organic reactions is chomoselectivity, in which a special functional group reacts preferentially to other functional groups . To investigate the chemeselectivity, equal amounts of benzyl alcohol and octanol were subjected to oxidation with Fe 3 O 4 @BNPs‐CPTMS‐Chitosan‐Pd(0) under the optimized reaction conditions (Scheme ).…”

“…Homoselectivity is a term used in certain reactions where two or more identical functional groups there are in a molecule, but only one of them is reacted selectively during the reaction …”

A new Schiff‐base complex of palladium nanoparticles on modified boehmite with di(pyridin‐2‐yl)methanone as a robust, reusable, and selective nanocatalyst in the C‐C coupling reaction

“…The Suzuki coupling reaction is an important transformation in modern synthetic organic chemistry for the production of biaryls 39 . Biaryls have great attraction because biaryls are applied as important units in the engineering compounds such as liquid crystal wires, expressive and molecular polymers, and in structural components such as drugs, natural products, and herbicides 40 . Therefore, we have designed a new heterogeneous catalyst of palladium on boehmite particles (Pd‐di(PM)@AlOOH) that utilizes for the synthesizing of biaryls through the Suzuki coupling reaction.…”