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<p>This article describes a straightforward extrusion technique for combining bentonite and aminoethyl-3-aminopropyltriethoxysilane (AEAPTES) to form a merged (Bentonite-AEAPTES). It had a basic character because of the amine group that was connected on bentonite. The prepared composite is applied for the construction of 2-amino-tetrahydro-4<i>H</i>-chromenes derivatives by Knoevenagel-Michael cyclocondensation reaction. These reactions are exceptional because to their large product yields, environmental friendliness, quick reaction times, wide range of substrate compatibility, and absence of hazardous solvent requirements. Additionally, after five catalyst recycling cycles and catalyst separation using a simple filtration method without any extraction, there is no discernible drop in activity. The produced compounds were analyzed using FT-IR and <sup>1</sup>H, and <sup>13</sup>C, NMR spectra. By using FT-IR, XRD, and SEM–EDX analysis, the synthesized composite is compared to bentonite.</p>

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Synthesis of functionalized 4H-chromenes catalyzed by bentonite-amine

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Kasaram Roja,
  • Reddi Mohan Naidu Kalla,
  • Sivarama Krishna Lakkboyana,
  • R. Adinarayana Reddy,
  • Atif Mossad Ali,
  • Jaewoong Lee

摘要

This article describes a straightforward extrusion technique for combining bentonite and aminoethyl-3-aminopropyltriethoxysilane (AEAPTES) to form a merged (Bentonite-AEAPTES). It had a basic character because of the amine group that was connected on bentonite. The prepared composite is applied for the construction of 2-amino-tetrahydro-4H-chromenes derivatives by Knoevenagel-Michael cyclocondensation reaction. These reactions are exceptional because to their large product yields, environmental friendliness, quick reaction times, wide range of substrate compatibility, and absence of hazardous solvent requirements. Additionally, after five catalyst recycling cycles and catalyst separation using a simple filtration method without any extraction, there is no discernible drop in activity. The produced compounds were analyzed using FT-IR and 1H, and 13C, NMR spectra. By using FT-IR, XRD, and SEM–EDX analysis, the synthesized composite is compared to bentonite.