Cobalt salophen complex supported on magnetic nanoparticles as an efficient reusable catalyst for oxidation of benzylic alcohols

Afshari, Mozhgan; Gholami, Maryam; Nazari, Simin; Naseh, Mohammad Reza Vesali

doi:10.13005/ojc/290431

Cited by 6 publications

(3 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Oxidation of diols to carbonyl compound selectively has been challenging in the synthesis of some industrial chemical products, thus has attracted a lot of research interest . For instance, 1‐phenylethane‐1,2‐diol, a typical benzyl diol compound, has been found to be oxidized to hydroxyl ketone (2‐hydroxy‐1‐phenylethan‐1‐one) selectively with variety of catalysts, including organocatalysts,, metal complexes, non‐noble metal oxides, bimetallics . However, the oxidation of 1‐phenylethane‐1,2‐ diol with aforementioned catalysts is usually carried out in organic solvents with harsh oxidants and needs long reaction time.…”

Section: Figurementioning

confidence: 99%

Oxidation of 1‐Phenylethane‐1,2‐Diol to 2‐Hydroxy‐1‐Phenylethan‐1‐One Catalyzed by Gold Nanocrystals

Zhang

Guo

2018

ChemistrySelect

View full text Add to dashboard Cite

We demonstrate here that under a mild condition (aqueous solution, pH 7, 50°C, 6 MPa O 2 ) gold nanocrystals (AuNCs) can catalyze the oxidation of 1-phenylethane-1,2-diol to 2-hydroxy-1-phenylethan-1-one selectively. And the yield can reach 87% when 94% the reactant is converted. Through comparing with different substrates, we show that the high selectivity of the AuNCs for 2-hydroxy-1-phenylethan-1-one is due to the activity difference between the two hydroxy groups in the diol. AuNCs tend to catalyze the oxidation of the hydroxy group that locates in α-C position of benzyl diol.

show abstract

Section: Figurementioning

confidence: 99%

Oxidation of 1‐Phenylethane‐1,2‐Diol to 2‐Hydroxy‐1‐Phenylethan‐1‐One Catalyzed by Gold Nanocrystals

Zhang

Guo

2018

ChemistrySelect

View full text Add to dashboard Cite

show abstract

“…Nanomagnetic catalysts are easily separated from the reaction medium and can be recycled several times, maintaining the catalytic efficiency [5][6][7]. Therefore, nanoparticles are significant alternatives to homogeneous catalysts, as they are able to provide high product yields with elevated reaction rates [2,8].…”

Section: Introductionmentioning

confidence: 99%

Sulfonated Silica Coated CoFe2O4 Magnetic Nanoparticles for the Synthesis of 3,4-Dihydropyrimidin-2(1H)-One and Octahydroquinazoline Derivatives

2023

Self Cite

View full text Add to dashboard Cite

Sulfonated-silica-coated cobalt ferrite (CoFe2O4) magnetic nanoparticles (MNPs-SiCoFe-SO3H) are efficient heterogeneous catalysts for the synthesis of 3,4-dihydropyrimidin-2(1H)-one and octahydroquinazoline derivatives in the absence of solvent. The effects of solvent, temperature, and catalyst amount on the reaction are investigated. The easy separation, reusability of the catalyst, simplicity of the procedure, mild reaction conditions, and good yields (68–95%) within short reaction times (15–70 min) are the advantages of this method. The catalyst can be reused up to eight times with not much loss of activity. Scanning electron microscopy images, X-ray diffraction spectra, and elemental analysis of the recycled catalyst show that the catalyst is stable after the reaction.

show abstract

“…In nonaqueous media, frequently used surfactants are tetraoctylphosphineoxide (TOPO) and oleic acid . In the synthesis of metals in aqueous media, cetyltrimethylammonium bromide (CTAB) has been one of the most popular molecules although this has been limited to only Au and silver metals so far. Among various techniques, the seeded growth method is a suitable and efficient technique for the synthesis of anisotropic Au nanocrystals .…”

Section: Introductionmentioning

confidence: 99%

Gelatin‐Immobilized High Aspect Ratio Gold Nanocrystals: An Efficient Catalyst for 4‐Nitrophenol Reduction

et al. 2015

View full text Add to dashboard Cite

This article highlights the progress in the synthesis of gelatin-immobilized anisotropic gold (Au) nanoparticles and their catalytic activity in 4-nitrophenol (4-NP) reduction. The catalytic process is monitored by using the UV-visible spectrophotometer, and the effect of shape and aspect ratio on the Au nanoparticles on catalytic activity is investigated. The catalytic process follows a pseudo-first-order kinetics with the rate constant in the range of 1.1 × 10 −3 s −1 to 4.5 × 10 −3 s −1 . It is found that high aspect ratio Au/gelatin shows the best conversion (99.89%), which is comparable to the spherical seed (99.93%). After a certain catalytic reaction, the recovery of expensive catalysts and their reuse without losing their activity is an essential element in the sustainable process development. The immobilization of the catalyst into gelatin allows the high aspect ratio Au/gelatin nanocatalyst to be recovered and reused for a number of cycles. C

show abstract

Cobalt salophen complex supported on magnetic nanoparticles as an efficient reusable catalyst for oxidation of benzylic alcohols

Cited by 6 publications

References 26 publications

Oxidation of 1‐Phenylethane‐1,2‐Diol to 2‐Hydroxy‐1‐Phenylethan‐1‐One Catalyzed by Gold Nanocrystals

Oxidation of 1‐Phenylethane‐1,2‐Diol to 2‐Hydroxy‐1‐Phenylethan‐1‐One Catalyzed by Gold Nanocrystals

Sulfonated Silica Coated CoFe2O4 Magnetic Nanoparticles for the Synthesis of 3,4-Dihydropyrimidin-2(1H)-One and Octahydroquinazoline Derivatives

Gelatin‐Immobilized High Aspect Ratio Gold Nanocrystals: An Efficient Catalyst for 4‐Nitrophenol Reduction

Contact Info

Product

Resources

About