Covalent supporting of novel dioxo‐molybdenum tetradentate pyrrole‐imine complex on Fe₃O₄ as high‐efficiency nanocatalyst for selective epoxidation of olefins

Abstract

A novel Mo(VI) tetradentate Schiff base complex based on two pyrrole‐imine donors was anchored covalently on Fe3O4 nanoparticles and characterized using physicochemical techniques. The catalytic epoxidation process was optimized in terms of the effects of solvent, reaction temperature, kind of oxidant and amount of oxidant and catalyst. Then the novel heterogeneous nanocatalyst was used for the efficient and selective catalytic epoxidation of internal alkenes (cyclohexene, cyclooctene, α‐pinene, indene and trans‐1,2‐diphenylethene) and terminal alkenes (n‐heptene, n‐octene, n‐dodecene and styrene) using tert‐butyl hydroperoxide (70% in water) as oxidant in 1,2‐dichloroethane as solvent. The prepared nanocatalyst is very effective for the selective epoxidation of cis‐cyclooctene with 100% conversion, 100% selectivity and turnover frequency of 1098 h−1 in just 30 min. The magnetic nanocatalyst was easily recovered using an external magnetic field and was used subsequently at least six times without significant decrease in conversion.

Manganese Ferrite Nanoparticles Modified by Mo(VI) Complex: Highly Efficient Catalyst for Sulfides and Olefins Oxidation Under Solvent‐less Condition

“…According to our previous works on the catalytic activity of d‐block Schiff base complexes, a MnFe] 2 O 4 supported Mo(VI) Schiff base complex, MnFe 2 O 4 ‐Mo(VI), derived from 1,3‐bis(4‐bromo‐2‐carboxyaldehyde phenoxy)propane has been developed in the presented work (Figure ). The novel heterogeneous catalyst was tested for its ability to oxidize olefins and sulfides selectively into epoxides and sulfoxides in green solvent‐less condition.…”

“…Solvent-less reactions are green method with great advantages such as, health of people, significant contributions to the protection of the environment, decreasing of waste and lowcost. [42] According to our previous works on the catalytic activity of d-block Schiff base complexes, [3,8,14,15,21,[43][44][45][46][47][48] a MnFe] 2 O 4 supported Mo(VI) Schiff base complex, MnFe 2 O 4 -Mo(VI), derived from 1,3-bis(4-bromo-2-carboxyaldehyde phenoxy)propane has been developed in the presented work ( Figure 1). The novel heterogeneous catalyst was tested for its ability to oxidize olefins and sulfides selectively into epoxides and sulfoxides in green solvent-less condition.…”

Excellent alkene epoxidation catalytic activity of macrocyclic‐based complex of dioxo‐Mo(VI) on supermagnetic separable nanocatalyst

“…[8][9][10][11] The recovery of a homogeneous catalyst from a reaction mixture is often difficult with high costs and causes additional waste. Furthermore, insufficient chemical and thermal stability, leaching of active metal into solvent and recycling of catalyst remain scientific challenges.…”

Alkali Blues: Blue‐Emissive Alkali Metal Pyrrolates

“…In the last decades, these ligands have attracted considerable attention in several fields of chemistry. For example, they have been applied in transition metal or lanthanide complexes, which are used as homogenous catalysts, especially for polymerization, and as biomimetic and bioinspired complexes [e.g. Mo( t Bu L) 2 O 2 or [Cu( t Bu L)] 2 ; H t Bu L=4‐ tert ‐butyl phenyl(pyrrol‐2‐ylmethylene)amine; Scheme ] .…”