A highly efficient nano-sized Cu<sub>2</sub>O/SiO<sub>2</sub>egg-shell catalyst for C–C coupling reactions

Kim, Soohee; Kang, Shin Wook; Kim, Aram; Yusuf, Mohammad; Park, Kang Hyun

doi:10.1039/c7ra13490h

Cited by 41 publications

(11 citation statements)

References 42 publications

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“…Only two examples of Cu 3 N/SiO 2 materials exist in the literature [ 67 , 68 ]. The impregnation of SiO 2 by a Cu(II) salt in solution followed by deposition–precipitation is an effective way to fabricate oxidic copper-based SiO 2 composites [ 69 , 70 ]. We have shown that such combined impregnation−deposition–precipitation approaches work equally well for nitride-SiO 2 composites.…”

Section: Resultsmentioning

confidence: 99%

Solution/Ammonolysis Syntheses of Unsupported and Silica-Supported Copper(I) Nitride Nanostructures from Oxidic Precursors

et al. 2021

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Herein we describe an alternative strategy to achieve the preparation of nanoscale Cu3N. Copper(II) oxide/hydroxide nanopowder precursors were successfully fabricated by solution methods. Ammonolysis of the oxidic precursors can be achieved essentially pseudomorphically to produce either unsupported or supported nanoparticles of the nitride. Hence, Cu3N particles with diverse morphologies were synthesized from oxygen-containing precursors in two-step processes combining solvothermal and solid−gas ammonolysis stages. The single-phase hydroxochloride precursor, Cu2(OH)3Cl was prepared by solution-state synthesis from CuCl2·2H2O and urea, crystallising with the atacamite structure. Alternative precursors, CuO and Cu(OH)2, were obtained after subsequent treatment of Cu2(OH)3Cl with NaOH solution. Cu3N, in the form of micro- and nanorods, was the sole product formed from ammonolysis using either CuO or Cu(OH)2. Conversely, the ammonolysis of dicopper trihydroxide chloride resulted in two-phase mixtures of Cu3N and the monoamine, Cu(NH3)Cl under similar experimental conditions. Importantly, this pathway is applicable to afford composite materials by incorporating substrates or matrices that are resistant to ammoniation at relatively low temperatures (ca. 300 °C). We present preliminary evidence that Cu3N/SiO2 nanocomposites (up to ca. 5 wt.% Cu3N supported on SiO2) could be prepared from CuCl2·2H2O and urea starting materials following similar reaction steps. Evidence suggests that in this case Cu3N nanoparticles are confined within the porous SiO2 matrix.

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Section: Resultsmentioning

confidence: 99%

Solution/Ammonolysis Syntheses of Unsupported and Silica-Supported Copper(I) Nitride Nanostructures from Oxidic Precursors

et al. 2021

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“…More recently, a mesoporous polymer-supported Cu NPs catalyst was developed [65] and applied to palladium-and solvent-free coupling of acid chloride and aryl alkynes. Similar experimental conditions were used in the acylation of aryl acetylenes with benzoyl chloride promoted by a nanosized Cu2O/SiO2 egg-shell catalyst [66]. Finally, Moghaddam and coworkers [67] reported the application of cobalt-copper ferrite nanoparticles (CoCuFe2O4), obtained by the coprecipitation method, to the synthesis of alkynyl ketones by acyl Sonogashira reactions.…”

Section: Copper-based Catalysts For Acyl Sonogashira Reactionsmentioning

confidence: 95%

Acyl Sonogashira Cross-Coupling: State of the Art and Application to the Synthesis of Heterocyclic Compounds

Albano

Aronica

2019

Catalysts

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The acyl Sonogashira reaction represents an extension of Sonogashira cross-coupling to acid chlorides which replace aryl or vinyl halides, while terminal acetylenes are used as coupling partners in both reactions. The introduction of a carbonyl functional group on the alkyne backbone determines a radical change in the reactivity of the products. Indeed, α,β-alkynyl ketones can be easily converted into different heterocyclic compounds depending on the experimental conditions employed. Due to its potential, the acyl Sonogashira reaction has been deeply studied with particular attention to the nature of the catalysts and to the structures of both coupling compounds. Considering these two aspects, in this review, a detailed analysis of the literature data regarding the acyl Sonogashira reaction and its role in the synthesis of several heterocyclic derivatives is reported.

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“…These observations veried no clogging of pores with copper species. 73 The specic pore volume increased aer supporting NP with copper nitrate. Aer loading Cu(II), larger pores generated; as a result, the average pore diameter increased from 12.73 to 19.70 nm.…”

Section: Characterization Of Cu(ii)/np Catalystmentioning

confidence: 99%

Natural phosphate-supported Cu(ii), an efficient and recyclable catalyst for the synthesis of xanthene and 1,4-disubstituted-1,2,3-triazole derivatives

et al. 2018

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A highly efficient nano-sized Cu₂O/SiO₂egg-shell catalyst for C–C coupling reactions

Abstract: Mesoporous SiO2-supported Cu2O nanoparticles as an egg-shell type catalyst were prepared by impregnation method.

Cited by 41 publications

References 42 publications

Solution/Ammonolysis Syntheses of Unsupported and Silica-Supported Copper(I) Nitride Nanostructures from Oxidic Precursors

Solution/Ammonolysis Syntheses of Unsupported and Silica-Supported Copper(I) Nitride Nanostructures from Oxidic Precursors

Acyl Sonogashira Cross-Coupling: State of the Art and Application to the Synthesis of Heterocyclic Compounds

Natural phosphate-supported Cu(ii), an efficient and recyclable catalyst for the synthesis of xanthene and 1,4-disubstituted-1,2,3-triazole derivatives

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A highly efficient nano-sized Cu2O/SiO2egg-shell catalyst for C–C coupling reactions

Abstract: Mesoporous SiO2-supported Cu2O nanoparticles as an egg-shell type catalyst were prepared by impregnation method.

Cited by 41 publications

References 42 publications

Solution/Ammonolysis Syntheses of Unsupported and Silica-Supported Copper(I) Nitride Nanostructures from Oxidic Precursors

Solution/Ammonolysis Syntheses of Unsupported and Silica-Supported Copper(I) Nitride Nanostructures from Oxidic Precursors

Acyl Sonogashira Cross-Coupling: State of the Art and Application to the Synthesis of Heterocyclic Compounds

Natural phosphate-supported Cu(ii), an efficient and recyclable catalyst for the synthesis of xanthene and 1,4-disubstituted-1,2,3-triazole derivatives

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A highly efficient nano-sized Cu₂O/SiO₂egg-shell catalyst for C–C coupling reactions