Zn(II)‐Functionalized Urea‐Linked COF: A Recyclable Catalyst for Carbonylative Coupling and Oxazolidinone Synthesis Under Atmospheric CO2 Pressure

Abstract Although carbon dioxide is a plentiful, affordable, and benign carbon source, its steady rise in the atmosphere as a major greenhouse gas has resulted in significant environmental issues. Herein, we have synthesized a urea‐linked covalent organic framework (TFPTA‐BDU COF) by condensation polymerization. Then Zn (II) ions were impregnated on the N‐rich TFPTA‐BDU COF. The resulting Zn@TFPTA‐BDU COF was obtained. It was characterized by FT‐IR (Fourier Transform Infrared Spectroscopy), PXRD (powder X‐ray diffraction), SEM (scanning electron microscopy), EDAX (energy dispersive X‐ray analysis), HR‐TEM (high‐resolution transmission electron microscopy), BET (Brunauer–Emmett–Teller), and XPS (X‐ray photoelectron spectroscopy). Zn@TFPTA‐BDU COF demonstrates commendable yields (i.e., 54%–88% yields) in CO 2 carbonylative coupling reactions, even under mild conditions. On the other hand, this newly synthesized catalyst also showed excellent performance in solvent‐free, room‐temperature oxazolidinones synthesis (with a yield of more than 90%) under sustainable conditions. Additionally, the as‐synthesized microporous COF catalyst demonstrated remarkable durability and can be recycled up to five times without any noticeable loss of its catalytic performance, indicating a true heterogeneous nature, highlighting its reusability, and making it a sustainable and cost‐effective solution. This work paves the way for developing efficient and sustainable CO 2 fixation methods using COFs as a catalyst, with broader potential applications.