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<p>In this study, the CuO–ZnO nanoparticles were synthesized via a green approach using aqueous extract of fallen neem leaves. This nanoparticle was used as an effective heterogenous catalyst for the synthesis of 2-amino-7-hydroxy-4-aryl-4H-chromene-3-carbonitrile derivatives through one-pot three-component reaction using aryl aldehydes, malononitrile, and resorcinol in ethanol: water under reflux condition. This study offers 70–90% yield of chromene derivatives, reaction in green solvents, value addition to biomass, and adherence to principles of green chemistry. The catalyst and products were characterized using XRD, TGA, ICP-OES, FESEM, FTIR, and <sup>1</sup>H NMR spectral data.</p>

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Green synthesis of CuO–ZnO nanoparticles and study of their activity as an efficient catalyst for the synthesis of 2-amino-7-hydroxy-4-aryl-4H-chromene-3-carbonitrile derivatives

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • Parul Yadav,
  • Ram Singh

摘要

In this study, the CuO–ZnO nanoparticles were synthesized via a green approach using aqueous extract of fallen neem leaves. This nanoparticle was used as an effective heterogenous catalyst for the synthesis of 2-amino-7-hydroxy-4-aryl-4H-chromene-3-carbonitrile derivatives through one-pot three-component reaction using aryl aldehydes, malononitrile, and resorcinol in ethanol: water under reflux condition. This study offers 70–90% yield of chromene derivatives, reaction in green solvents, value addition to biomass, and adherence to principles of green chemistry. The catalyst and products were characterized using XRD, TGA, ICP-OES, FESEM, FTIR, and 1H NMR spectral data.