621-08-9Relevant academic research and scientific papers
Covalent Triazine Framework as an Efficient Photocatalyst for Regeneration of NAD(P)H and Selective Oxidation of Organic Sulfide
Chaubey, Surabhi,Yadav, Rajesh K.,Tripathi, Santosh K.,Yadav, Bal Chandra,Singh, Sudhir N.,Kim, Tae Wu
, p. 150 - 159 (2022)
Covalent triazine frameworks (CTFs), belonging to the super-family of covalent organic frameworks, have attracted significant attention as a new type of photosensitizer due to the superb light-harvesting ability and efficient charge transfer originating f
Fullerene soot and a fullerene nanodispersion as recyclable heterogeneous off-the-shelf photocatalysts
Jozeliūnait?, Augustina,Val?eckas, Domantas,Orentas, Edvinas
, p. 4104 - 4111 (2021/02/02)
Metal-free heterogeneous photocatalysis, which requires no prior catalyst immobilization or chemical modification and can operate in green solvents, represents a highly-sought after, yet currently still underdeveloped, synthetic method. In this report we present a comparative study which aims to evaluate the use of unmodified fullerene soot and a fullerene nanodispersion as non-soluble and quasi-soluble carbon-based photocatalysts, respectively, for sulfide oxidation and other transformations using oxygen as an oxidant in ethanol. A wide range of sulfoxides were successfully prepared with good yields and chemoselectivity using a very low catalyst loading. The fullerene soot photocatalyst is easily recovered and shows excellent stability of the catalytic properties. The reaction was shown to proceed via a singlet oxygen pathway and has a high selectivity for aliphatic sulfides, whereas the oxidation of thioanisoles can be accomplished using an amine mediated electron transfer mechanism. The applicability of the fullerene nanodispersion as a general purpose photocatalyst was demonstrated in radical cyclization, boronic acid oxidation and imine formation reactions.
Green synthesis of gold nanoparticles (Au NPs) using Tribulus terrestris extract: Investigation of its catalytic activity in the oxidation of sulfides to sulfoxides and study of its anti-acute leukemia activity
Ahmed, Ahmed Ezzat,El-kott, Attalla,Khames, Ahmed,Zein, Mohamed Abdellatif,Zhao, Peng
, (2021/07/16)
With regards to applied, facile, green chemical research, a bio-inspired approach is being reported for the synthesis of Au NPs by using Tribulus terrestris extract. The innate oxygenated phytochemicals facilitated the green reduction of Au3+ ions to corresponding NPs and also stabilized them by encapsulating them. This modification prevented the as-synthesized Au NPs towards agglomeration and tiny NPs were obtained in uniformly spherical in shape and in the range of 10–15 nm dimension. Physicochemical characteristics of the green synthesized Au NPs were evaluated by advanced physicochemical techniques like UV–Vis and FT-IR spectroscopy, SEM, TEM, EDX and XRD study. Catalytic performance of the biomolecule functionalized Au NPs was investigated in the controlled and selective oxidation of sulfides to sulfoxides using hydrogen peroxide as green oxidant at room temperature. Aromatic, aliphatic and heterocyclic sulfides were oxidized to their corresponding sulfoxides with high yields without formation of over oxidized sulfones. The catalyst was easily recovered and recycled for 8 successive times without noticeable decrease in catalytic activity. In addition, the biosynthesized Au NPs indicated suitable antioxidant and anti-acute leukemia properties against THP-1 cell line. Tribulus terrestris extract and the green synthesized Au NPs exhibited a maximum DPPH scavenging activity of 78% and 29.37%, respectively. Again, in the anticancer studies over THP-1 cell line following MTT assay, the Au NP exhibited gradual reduced % cell viability with increase in its concentration. At an Au NPs concentration of 2000 μg/mL, the % toxicity became maximum suggesting efficient inhibition of cancer invasion. Based on the above results, Au NPs-Tribulus could be administered as a potential anti-leukemia drug for the treatment of acute leukemia following the clinical trial studies in humans.
Green synthesis of Cu/Fe3O4nanocomposite using Calendula extract and evaluation of its catalytic activity for chemoselective oxidation of sulfides to sulfoxides with aqueous hydrogen peroxide
Ansari, Siddique Akber,Elgorban, Abdallah M.,Marraiki, Najat,Syed, Asad
, (2021/10/04)
Plant mediated biogenic synthesizednanoparticles have beenquite familiar as next generation prospective catalysts. In this work, we have demonstrated copper nanoparticles (Cu NP) immobilized magnetic Fe3O4 nanoparticles using Calendu
Synthesis and Characterization of Magnetic Functionalized Ni and Cu Nano Catalysts and Their Application in Oxidation, Oxidative Coupling and Various Multi-Component Reactions
Hajjami, Maryam,Sheikhaei, Shiva,Gholamian, Fatemeh,Yousofvand, Zakieh
, p. 2420 - 2435 (2021/01/04)
Abstract: Two magnetic nano catalysts of nickel and copper, Fe3O4@SiO2@DOP-BenPyr-M(II), (M=Ni and Cu) have been synthesized. These catalysts were applied as recoverable, efficient and new heterogeneous catalysts for the high yielding and room temperature one-pot procedure of selective oxidation of sulfides to sulfoxides and oxidative coupling of thiols to disulfides. In addition, the catalytic activity of Fe3O4@SiO2@DOP-BenPyr-Ni(II) was investigated as heterogeneous nanocatalyst for synthesis of 2,3-dihydroquinazolin-4(1H)-ones, 5-substituted 1H-tetrazoles and polyhydroquinolines. The synthesized catalysts were characterized by FT-IR, TGA, XRD, VSM, EDX, ICP and SEM techniques. These catalysts were recovered by an external magnet and reused several times without significant loss of catalytic efficiency. Graphic Abstract: [Figure not available: see fulltext.]
Cu–citric acid metal–organic framework: Synthesis, characterization and catalytic application in Suzuki–Miyaura cross-coupling reaction and oxidation of sulfides
Koolivand, Mostafa,Nikoorazm, Mohsen,Ghorbani-Choghamarani, Arash,Tahmasbi, Bahman
, (2021/10/16)
Citric acid with three carboxylic groups was used as an outstanding chelating agent was utilized for the preparation of Cu–citric acid metal–organic framework (Cu–CA–MOF). The prepared MOF was characterized by FT-IR, XRD, EDS, AAS, SEM, WDX and BET analysis. N2 adsorption–desorption isotherms indicated acceptable BET surface area for Cu–CA–MOF. SEM images were shown that Cu–CA–MOF has geometric polyhedral shapes. Also, catalytic activity of Cu–CA–MOF successfully examined for the Suzuki–Miyaura cross-coupling reaction and chemoselective oxidation of sulfides to sulfoxides.
In Situ Generated Organic Peroxides in Oxidative Desulfurization of Naphtha Reformate
Akopyan, A. V.,Anisimov, A. V.,Eseva, E. A.,Sinikova, N. A.
, p. 472 - 482 (2021/06/01)
Abstract: The paper describes a method developed for the oxidation of organosulfur compounds using organic peroxides generated in situ under the action of atmospheric oxygen on gasoline fraction after reforming. Naphtha reformate that contained dibenzothiophene as a model substrate was subjected to oxidative desulfurization by organic peroxides generated in situ under atmospheric oxygen. The study examined various catalytic systems, including immobilized Anderson-type polyoxometalates, and initiators, which, in combination, provided effective generation of alkyl hydroperoxides, selective oxidation of organosulfur compounds in the hydrocarbon feedstock, and a high conversion rate.
Magneli-type tungsten oxide nanorods as catalysts for the selective oxidation of organic sulfides
D?ren, René,Hartmann, Jens,Leibauer, Benjamin,Panth?fer, Martin,Mondeshki, Mihail,Tremel, Wolfgang
, p. 14027 - 14037 (2021/10/19)
Selective oxidation of thioethers is an important reaction to obtain sulfoxides as synthetic intermediates for applications in the chemical industry, medicinal chemistry and biology or the destruction of warfare agents. The reduced Magneli-type tungsten oxide WO3?xpossesses a unique oxidase-like activity which facilitates the oxidation of thioethers to the corresponding sulfoxides. More than 90% of the model system methylphenylsulfide could be converted to the sulfoxide with a selectivity of 98% at room temperature within 30 minutes, whereas oxidation to the corresponding sulfone was on a time scale of days. The concentration of the catalyst had a significant impact on the reaction rate. Reasonable catalytic effects were also observed for the selective oxidation of various organic sulfides with different substituents. The WO3?xnanocatalysts could be recycled at least 5 times without decrease in activity. We propose a metal oxide-catalyzed route based on the clean oxidant hydrogen peroxide. Compared to other molecular or enzyme catalysts the WO3?xsystem is a more robust redox-nanocatalyst, which is not susceptible to decomposition or denaturation under standard conditions. The unique oxidase-like activity of WO3?xcan be used for a wide range of applications in synthetic, environmental or medicinal chemistry.
Oxygen-to-Oxygen Silyl Migration of α-Siloxy Sulfoxides and Oxidation-Triggered Allicin Formation
Kelly, Shane S.,Shen, Tun-Li,Xian, Ming
, p. 3741 - 3745 (2021/05/10)
Oxidation of α-siloxy thioethers leads to the formation of the corresponding sulfoxides as unstable intermediates, which undergo an intramolecular oxygen-to-oxygen silyl migration to break the C-S linkage. This process produces silyl protected sulfenic acids and subsequently thiosulfinates. It was used to develop oxidation-triggered allicin donors.
Trisaminomethane–cobalt complex supported on Fe3O4 magnetic nanoparticles as an efficient recoverable nanocatalyst for oxidation of sulfides and C–S coupling reactions
Ashraf, Muhammad Aqeel,Liu, Zhenling,Peng, Wan-Xi
, (2019/11/16)
In this work, trisaminomethane–cobalt complex immobilized onto the surface of Fe3O4 magnetic nanoparticles was successfully prepared via a simple and inexpensive procedure. The prepared nanocatalyst was considered a robust and clean nanoreactor catalyst for the oxidation and synthesis of sulfides under green conditions. This ecofriendly heterogeneous catalyst was characterized by Fourier transform infrared spectroscopy, X-ray diffractometry, energy-dispersive X-ray spectroscopy, inductively coupled plasma-atomic emission spectroscopy, thermogravimetric analysis, vibrating sample magnetometry, X-ray mapping, scanning electron microscopy, and transmission electron microscopy techniques. Use of green medium, easy separation and workup, excellent reusability of the nanocatalyst, and short reaction time are some outstanding advantages of this method.
