access icon free Green approach for the synthesis of carboxycoumarins by using a highly active magnetically recyclable nanobiocomposite via sustainable catalysis

An efficient approach was reported for the synthesis of substituted 3-carboxycoumarins via a Knoevenagel condensation reaction between Meldrum's acid and substituted salicylaldehydes in the presence of a magnetic cellulose/Ag catalyst in EtOH at room temperature. This protocol includes many advantages such as remarkable magnetic properties of the nanobiocomposite catalyst, short reaction times, high yields and simple isolation of the organic products. In addition, the nanostructure catalyst can be easily separated from the reaction mixture and reused several times efficiently. Fourier transform infrared spectra, nuclear magnetic resonance spectra, X-ray diffraction pattern and field emission scanning electron microscopy images were performed for the characterisation of the products and the nanocatalyst.

Inspec keywords: condensation; catalysts; nanocomposites; nanofabrication; silver; catalysis; recycling; nuclear magnetic resonance; field emission scanning electron microscopy; filled polymers; Fourier transform infrared spectra; organic compounds

Other keywords: X-ray diffraction; nuclear magnetic resonance spectra; substituted salicylaldehydes; substituted 3-carboxycoumarins; green approach; nanostructure catalyst; Knoevenagel condensation reaction; Meldrum acid; temperature 293 K to 298 K; organic products; magnetic cellulose-silver catalyst; highly active magnetically recyclable nanobiocomposite; sustainable catalysis; field emission scanning electron microscopy; magnetic properties; Ag; Fourier transform infrared spectra

Subjects: Other methods of nanofabrication; Infrared and Raman spectra and scattering (condensed matter); Other luminescence spectra and radiative recombination (condensed matter); Nuclear magnetic resonance and relaxation (condensed matter); Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials; Heterogeneous catalysis at surfaces and other surface reactions

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http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2017.0560
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