Reusable BNPs‐SiO 2 @(CH 2 ) 3 NHSO 3 H‐catalysed selective oxidation of sulfides to sulfones

2019

ChemistrySelect

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In this content, a stable, efficient, active, reusable and inexpensive magnetic boehmite was synthesized by hydrothermal sol-gel method. In the next step magnetic boehmite immobilized further with palladium chitosan complex (Fe 3 O 4 @BNPs-CPTMS-Chitosan-Pd (0)). This novel nanocatalyst was used for the oxidation of alcohols in ethanol and the preparation of 5-substituted tetrazoles in solvent-free conditions. To confirm the structure of catalyst, a variety of techniques, including FT-IR, XRD, FESEM, TEM, EDX, mapping, VSM, TGA-DTA, BET, ICP and UV-Visible were used. The mol % of catalyst was obtained with ICP (2.8 mol%). Also, some benefits of the catalyst are: excellent magnetic properties, easy separating from the reaction mixture with the external magnet, the use of cheap and affordable materials, good surface area (55.94 m 2 /g), low palladium leaching from the catalyst surface, use the green ligand and the use of catalyst for at least 5 consecutive times without reducing the catalytic activity.

Section: Introductionmentioning

confidence: 93%

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

Khodamorady

2019

ChemistrySelect

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“…[ 24,29 ] Because of its low cost, affordable, and stable boehmite, it has been considered as appropriate support, and researchers have used it in their research works. [ 5,30–36 ] Boehmite (γ‐AlOOH) is a metastable phase of alumina that has free AlOH in the surface of nanoparticles. [ 37,38 ] For loading metal ions, these free AlOH groups on the surface of solid support can be used for ligand connection.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of 5‐substituted 1H‐tetrazoles and oxidation of sulfides by using boehmite nanoparticles/nickel‐curcumin as a robust and extremely efficient green nanocatalyst

Jani

2020

Applied Organom Chemis

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Nickel‐anchored curcumin‐functionalized boehmite nanoparticles (BNPs@Cur‐Ni) as a robust and versatile nanocatalyst was synthesized and well‐characterized by using Fourier transform infrared (FT‐IR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X‐ray (EDX), X‐ray mapping, thermogravimetric analysis (TGA), differential thermal analysis (DTA), Brunauer–Emmett–Teller (BET), X‐ray diffraction (XRD), and inductively coupled plasma optical emission spectroscopy (ICP‐OES). The synthesis of 5‐substituted 1H‐tetrazoles and the oxidation of sulfides were conducted by BNPs@Cur‐Ni with excellent turnover number (TON) and turnover frequency (TOF) outcomes. Also, the catalyst was reused for several sequential runs without Ni leaching or decreasing in reaction yield. Utilizing the curcumin and boehmite with a natural source as well as poly(ethylene glycol) (PEG) as a solvent in this simple protocol can be based on green chemistry rules.

“…23,24 Many uses of boehmite have been reported in recent years, some of which include use as an absorbent, ceramic enhancer, catalyst, vaccine assistant, cosmetic product, and infrequently a support for heterogeneous catalysts. 25,26 Boehmite nanoparticles can be easily synthesized in an aqueous medium using NaOH and Al(NO 3 ) 3 $9H 2 O at appropriate conditions and room temperature. 27 The aluminum oxide-hydroxide boehmite (g-AlOOH) mineral is a component of aluminum ore bauxite which has a surface full of hydroxyl groups.…”

Section: Introductionmentioning

confidence: 99%

Fe₃O₄@BNPs@SiO₂–SO₃H as a highly chemoselective heterogeneous magnetic nanocatalyst for the oxidation of sulfides to sulfoxides or sulfones

Kermanshahi

2019

RSC Adv.

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