☆ 4.6 Article

Nano magnetite supported metal ions as robust, efficient and recyclable catalysts for green synthesis of propargylamines and 1,4-disubstituted 1,2,3-triazoles in water

NEW JOURNAL OF CHEMISTRY (2015)

期刊

NEW JOURNAL OF CHEMISTRY

卷 39, 期 3, 页码 1827-1839

出版社

ROYAL SOC CHEMISTRY

DOI: 10.1039/c4nj01866d

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Chemistry, Multidisciplinary

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Mazandaran University

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摘要

Nano magnetite functionalized 2,20-biimidazole complex of metal ions Cu(I), Cu(II), Ni(II) and Co(II) were successfully synthesized and characterized by different techniques such as elemental analysis, FT-IR spectroscopy, X-ray diffraction (XRD), thermo gravimetric analysis (TGA), transmission electron microscopy (TEM), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM with EDS), atomic absorption spectroscopy (AAS), inductively coupled plasma-optical emission spectrometry (ICP-OES) and vibrating sample magnetometer (VSM) instrument. The synthesized magnetic nanoparticles were used as heterogeneous catalysts for the synthesis of propargylamines via the three-component coupling reaction of aldehydes, alkynes and amines and one-pot synthesis of 1,4-disubstituted 1,2,3-triazoles by the click reaction of primary halides or tosylates, sodium azide and terminal acetylenes in aqueous media. The prepared nanocatalyst can be facilely recovered and reused many times without a significant decrease in activity and selectivity. The high catalytic activity, thermal stability and reusability, simple recovery and eco-friendly nature of the catalyst make the present method particularly attractive in green chemistry.

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Synthesis of p-aminophenol by transfer hydrogenation of nitrobenzene with formic acid as a hydrogen source

Yisheng Zhang, Wensong Li, Jing Li, Fang Li, Wei Xue, Xinqiang Zhao, Yanji Wang

Summary: Pt/C and SO42-/ZrO2 were used as catalysts for the synthesis of p-aminophenol through the catalytic transfer hydrogenation of nitrobenzene in water with formic acid as the hydrogen source. The optimal Pt loading for PAP selectivity was found to be 1 wt%. The presence of different valence states of Pt affected both the nitrobenzene hydrogenation and formic acid decomposition. Among different solid acid catalysts tested, SO42-/ZrO2 exhibited the highest catalytic activity for p-aminophenol formation. Under the optimized reaction conditions, the conversion of nitrobenzene reached 80.0%, with a selectivity of 47.6% for p-aminophenol.

NEW JOURNAL OF CHEMISTRY (2024)

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Article Chemistry, Multidisciplinary

A CuMoO4 nanocatalyst for Csp2-O cross-couplings; easy access to nitrofen derivatives

Pradyota Kumar Behera, Papita Behera, Amlan Swain, Santosh Kumar Sahu, Ajeena Sahoo, Laxmidhar Rout

Summary: We have developed a simple and direct method for the synthesis of diaryl ether using an oxygen bridged bimetallic CuMoO4 nanocatalyst under mild reaction conditions. The catalyst exhibited tolerance towards a wide range of substrates with various functional groups. It is efficient and recyclable. This methodology allows easy access to nitrofen derivatives (herbicides) from unactivated 2,4-dichlorophenol, which are important for agriculture and pharmaceuticals.

NEW JOURNAL OF CHEMISTRY (2024)

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Article Chemistry, Multidisciplinary

A mechanistic study on coupling of CO2 and epoxide mediated by guanidine/TBAI catalysts

Yihua Fu, Yan Zhang, Changwei Hu, Zhishan Su

Summary: The mechanism of the reaction between CO2 and styrene oxide for cyclic carbonate was revealed using density functional theory calculations. The noncatalytic reaction occurred via a concerted mechanism, while in the presence of guanidine and tetrabutylammonium iodide (TBAI) co-catalysts, the epoxide ring-opening by nucleophilic attack of an iodide anion was predicted to be the rate-determining step. Guanidine acted as the H-bond donor to activate styrene oxide, facilitating the reaction with a lower activation barrier.

NEW JOURNAL OF CHEMISTRY (2024)

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Article Chemistry, Multidisciplinary

Localized surface plasmon resonance assisted photoredox catalysis using newly fabricated copper-nanorods: a decarboxylative approach towards carbon-hydrogen bond formation under visible light

Saikat Khamarui, Sirshendu Ghosh

Summary: Copper nanorods (Cu-NRs) exhibit significant plasmonic behavior and can act as efficient catalysts in redox processes and coupling. A benign decarboxylative approach, utilizing localized surface plasmon resonance (LSPR) assisted catalysis with Cu-NRs, has been developed for the production of alkane analogues from alkyl carboxylic acids under visible light. The catalyst shows a broad substrate scope and high functional group tolerance, without the need for an external oxidant or proton source. A plausible mechanism for this recyclable nano-catalyst has also been proposed based on control experiments.

NEW JOURNAL OF CHEMISTRY (2024)

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