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<p>Multicomponent reactions (MCRs) offer a sustainable and efficient pathway to complex molecular architectures. Here, we show the design and synthesis of a α-amino(2-hydroxybenzyl)-linked covalent organic framework (Betti-COF) <i>via</i> a one-pot, three-component solvothermal Betti reaction. This approach expands the scope of the MCR-based COF synthesis strategies by introducing a multicomponent pathway to highly ordered crystalline frameworks without the need for step-by-step linkage construction. The resulting <i>s</i>-Betti-COF exhibits a distinct hollow spherical morphology, high thermal stability, and robust porosity. This framework provides ideal support for the immobilization of small palladium nanoparticles (1-2 nm) within its pores to form the <i>s</i>-Betti-COF nanocomposite. The prepared samples were characterized by FT-IR, DNP-enhanced <sup>13</sup>C CP-MAS NMR, DNP-enhanced <sup>15</sup>N CP-MAS NMR, XRD, HR-TEM, FE-SEM, EDS, XPS, and nitrogen physisorption analysis. Kinetic investigations, including Hammett analysis, support a reaction mechanism involving an anionic intermediate. This study introduces the Betti reaction as a synthetic tool for constructing functional COFs and establishes these materials as highly effective nanoreactors for heterogeneous catalysis.</p>

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Multicomponent Betti reaction affords covalent organic framework nanoreactor for palladium-catalyzed nitroarene reduction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月21日

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  • Neda Salarinejad,
  • Mohammad Dinari,
  • Jonas Lins,
  • Torsten Gutmann,
  • Keun Hwa Chae

摘要

Multicomponent reactions (MCRs) offer a sustainable and efficient pathway to complex molecular architectures. Here, we show the design and synthesis of a α-amino(2-hydroxybenzyl)-linked covalent organic framework (Betti-COF) via a one-pot, three-component solvothermal Betti reaction. This approach expands the scope of the MCR-based COF synthesis strategies by introducing a multicomponent pathway to highly ordered crystalline frameworks without the need for step-by-step linkage construction. The resulting s-Betti-COF exhibits a distinct hollow spherical morphology, high thermal stability, and robust porosity. This framework provides ideal support for the immobilization of small palladium nanoparticles (1-2 nm) within its pores to form the s-Betti-COF nanocomposite. The prepared samples were characterized by FT-IR, DNP-enhanced 13C CP-MAS NMR, DNP-enhanced 15N CP-MAS NMR, XRD, HR-TEM, FE-SEM, EDS, XPS, and nitrogen physisorption analysis. Kinetic investigations, including Hammett analysis, support a reaction mechanism involving an anionic intermediate. This study introduces the Betti reaction as a synthetic tool for constructing functional COFs and establishes these materials as highly effective nanoreactors for heterogeneous catalysis.