Cu-nanoparticles on cellulose/H2O–CH3CN/microwave: a green system for the selective oxidation of alcohols to aldehydes

Baruah, Diganta; Saikia, Ujwal Pratim; Pahari, Pallab; Konwar, Dilip

doi:10.1016/j.tetlet.2015.03.025

Cited by 24 publications

(3 citation statements)

References 71 publications

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“…Table shows TOF of CuY0.5, zeolite, and Cu-related NPs previously reported. − CuY0.5 achieved a high TOF of 17 h –1 at 6 h in the air. This value was higher than those of any other reports where air was used as an oxidant despite the mild condition (lower reaction temperature than other reports).…”

Section: Results and Discussionmentioning

confidence: 86%

Catalytic Activity of Nonaggregating Cu Nanoparticles Supported in Pores of Zeolite for Aerobic Oxidation of Benzyl Alcohol

Sakane,

Akimoto,

Konishi

et al. 2023

ACS Omega

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Cu nanoparticles (NPs) as catalysts have the good advantage of being more abundant than noble metal NPs. In this study, we synthesized nonaggregating Cu NPs supported in Y-type zeolite by the photoreduction method. In this method, Cu ions in pores of zeolite can be slowly reduced with a small amount of reductant at room temperature. The high-resolution transmission electron microscope, energy dispersive X-ray spectroscopy, X-ray diffraction patterns, and UV–Vis spectra supported that nonaggregating Cu NPs existed in the pores of zeolite. Catalytic activities of Cu NP-zeolite were investigated for the aerobic oxidation of benzyl alcohol. Our Cu NP-zeolite had a large turnover frequency of 17 h–1. The yield of benzaldehyde increased in proportion to the amount of Cu loading at ≤0.5 wt %, indicating that Cu NPs in pores of zeolite work as catalysts for selective aerobic oxidation of benzyl alcohol. The high catalytic activity was brought by nonaggregating Cu NPs in pores of zeolite. The catalytic reaction for other aromatic alcohols with electron-donating groups proceeded, whereas it did not proceed for the aromatic alcohols with electron-withdrawing groups or aliphatic alcohols, indicating that the interaction between zeolite and the benzene ring also contributed to the reaction. This study would be expected to contribute to the development of Cu NP catalysts.

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Section: Results and Discussionmentioning

confidence: 86%

Catalytic Activity of Nonaggregating Cu Nanoparticles Supported in Pores of Zeolite for Aerobic Oxidation of Benzyl Alcohol

Sakane,

Akimoto,

Konishi

et al. 2023

ACS Omega

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“…Also, the reaction conditions (temperature, reaction time and catalyst loading) used for the oxidation reactions involving the Cu‐AmP‐CPG/TEMPO system are competitive with those of other benchmark heterogeneous catalysts ,,,. Additionally, the Cu‐AmP‐CPG was shown to operate efficiently under solvent‐free conditions, unlike some other reported heterogeneous protocols ,,,,,,,–. It is also important to emphasize that there also exist metal‐free protocols based on nitric acid‐assisted oxidation systems and TEMPO, which are also attractive systems for carrying out the oxidation of alcohols.…”

Section: Methodsmentioning

confidence: 99%

Copper Nanoparticles on Controlled Pore Glass and TEMPO for the Aerobic Oxidation of Alcohols

et al. 2017

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“…26 Thus, considering the economy and environmental friendliness, it is highly desirable to develop less expensive, easily separable, reusable non-noble heterogeneous catalysts, particularly, based on bio-derived materials under base-free conditions using green oxidants and green media (e.g., water) as the solvent. In this context, several biodegradable supports such as chitosan 27 , wool, 28 cellulose, 29 and starch 30 have been reported. In addition, the presence of magnetic element in heterogeneous catalysts is additionally desirable owing to their facile and efficient magnetic separation after reactions.…”

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confidence: 99%

Magnetically separable chicken feathers: a biopolymer based heterogeneous catalyst for the oxidation of organic substrates

et al. 2016

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Magnetically separable poultry chicken feathers were found to be efficient, green and heterogeneous catalyst for oxidation of alcohols and sulfides to the corresponding carbonyl compounds and sulfoxides, respectively using t-butyl hydroperoxide (TBHP) as oxidant with complete selectivity and higher conversions. The developed catalyst exhibited higher stability, activity and better recycling ability than the bare magnetic nanoparticles. The designed catalyst could readily be recovered by external magnet without showing any significant leaching during the reaction.

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Cu-nanoparticles on cellulose/H2O–CH3CN/microwave: a green system for the selective oxidation of alcohols to aldehydes

Cited by 24 publications

References 71 publications

Catalytic Activity of Nonaggregating Cu Nanoparticles Supported in Pores of Zeolite for Aerobic Oxidation of Benzyl Alcohol

Catalytic Activity of Nonaggregating Cu Nanoparticles Supported in Pores of Zeolite for Aerobic Oxidation of Benzyl Alcohol

Copper Nanoparticles on Controlled Pore Glass and TEMPO for the Aerobic Oxidation of Alcohols

Magnetically separable chicken feathers: a biopolymer based heterogeneous catalyst for the oxidation of organic substrates

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