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

Abstract

A phenoxybutane-based Schiff base complex of cis-dioxo-Mo(VI) was supported on paramagnetic nanoparticles and characterized using powder Xray diffraction, infrared, diffuse reflectance and atomic absorption spectroscopies, scanning and transmission electron microscopies and vibrating sample magnetometry. The separable nanocatalyst was tested for the selective epoxidation of cyclohexene, cyclooctene, styrene, indene, α-pinene, 1-octene, 1-heptene, 1-dodecene and trans-stilbene using tert-butyl hydroperoxide (80% in di-tert-butyl peroxide-water, 3:2) as oxidant in chloroform. The catalyst was efficient for oxidation of cyclooctene with 100% selectivity for epoxidation with 98% conversion in 10 min. We were able to separate magnetically the nanocatalyst using an external magnetic field and used the catalyst at least six successive times without significant decrease in conversion.The turnover frequency of the catalyst was remarkable (2556 h −1 for cyclooctene). The proposed nanomagnetic catalyst has advantages in terms of catalytic activity, selectivity, catalytic reaction time and reusability by easy separation.

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.…”

“…Transition metal complexes are widely used as catalysts for production of important organic compounds Mo(VI) complexes have in particular found interest for the oxidation of olefins‐ and sulfides‐ into epoxides‐ and sulfoxides‐ to provid access to industrially important compounds, surfactants, intermediates, drug, antifungal agents and epoxy resins . Homogeneous catalysts are mainly used for these chemical transformations.…”

“…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.…”

Recent Advances in Facile Liquid Phase Epoxidation of Light Olefins over Heterogeneous Molybdenum Catalysts

“…Such structure is very efficient for low temperature epoxidation, leading to conversion and selectivity [cyclooctene (Y=100 %), styrene (Y=2.4 %), limonene (Y=75.2 %), Table S1, #94‐98]. Payami et al . reported macrocyclic‐based complex of dioxo‐Mo (VI) on supermagnetic separable nanocatalyst which show good performances for oxidation of cyclohexene (Y=100 %), cyclooctene (Y=100 %), 1‐heptene (Y=86 %), 1‐octene (Y=86 %), 1‐dodecene (Y=87 %), styrene (Y=18 %), Table S1, #99–104.…”

“…Such structure is very efficient for low temperature epoxidation, leading to conversion and selectivity [cyclooctene Table S1, #94-98]. Payami et al [51] reported macrocyclic-based complex of dioxo-Mo (VI) on supermagnetic separable nanocatalyst which show good performances for oxidation of Table S1, #99-104.…”