Cu(II) Schiff base complexes on montmorillonite as nano-reactor heterogeneous catalysts for the epoxidation of cyclooctene: synthesis, characterization and immobilization

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

“…[16,[26][27][28][29][30] Magnetic separation renders the recycling of catalysts from solution using external magnetic fields much easier than filtration and centrifugation. In continuation of our previous investigation of catalytic activity of Schiff base complexes, [6,[9][10][11]15,19] herein we report the anchoring of novel cisdioxomolybdenum(VI) macrocyclic Schiff base complex by reaction of 1,4-bis(2-carboxyaldehydephenoxy)butane, MoO 2 Cl 2 (DMF) 2 and amino-modified magnetite nanoparticles (Scheme 1). The new nanocatalyst (Fe 3 O 4 @SiO 2 -(CH 2 ) 3 -PBSB/MoO 2 ) was characterized using Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS), vibrating sample magnetometry (VSM), energy-dispersive X-ray spectroscopy (EDX) and powder X-ray diffraction (XRD), and tested for epoxidation of internal alkenes (cyclohexene, cyclooctene, α-pinene, indene, trans-stilbene) and terminal alkenes (1-heptene, 1-octene, 1-dodecene, styrene) with TBHP (80% in di-tert-butyl peroxide-water, 3:2) as oxidant.…”

“…[15][16][17][18] A main idea for supporting of metal complexes is to anchor the metal complexes onto large-surface-area inorganic materials such as zeolites and metal oxides. [16,[19][20][21][22][23][24][25] Nowadays, magnetite nanoparticles are of particular interest because of their unique properties including high surface area, low toxicity, ability to be separated and biocompatibility. [16,[26][27][28][29][30] Magnetic separation renders the recycling of catalysts from solution using external magnetic fields much easier than filtration and centrifugation.…”

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.…”

Magnetically Reusable MnFe2O4 Nanoparticles Modified with Oxo‐Peroxo Mo (VI) Schiff‐Base Complexes: A High Efficiency Catalyst for Olefin Epoxidation under Solvent‐Free Conditions

“…[29][30][31][32] The byproduct (tBuOH) of tert-butyl hydroperoxide in ep(oxidation) processes is used as an octane booster in gasoline. [33] Motivated by our recent results on the catalytic ability of transition metal Schiff base complexes, [4,12,22,[30][31][32] in this work we report on the synthesis of oxo-peroxo molybdenum(VI) Schiff base complexes supported onto amine-terminated MnFe 2 O 4 . The formed MP@MoOO 2 nanocatalyst was characterized by various techniques and tested for its ability for epoxidation of different organic compounds bearing either internal or terminal alkene functions without the use of any additional solvent.…”