Sustainable Synthesis of Quinazolinones Through Boiler Flue Gas CO₂ Utilization Via Pd@POP‐1 Catalyst Under Mild Conditions

Abstract A catalyst, Pd@POP‐1, has been successfully synthesized by embedding palladium (Pd) nanoparticles into a nitrogen‐rich porous organic polymer (POP) through the copolymerization of imidazole and triazine ionic salts with divinylbenzene. This catalyst features a unique imine (−C=N) structure within the triazine ring and multiple coupled imine groups, which significantly enhances CO 2 adsorption efficiency and exhibits remarkable catalytic performance. At ambient pressure and mild temperatures, Pd@POP‐1 effectively converts low‐concentration CO 2 (less than 15 vol.%) into quinazolinones, even in the presence of SO 2 (up to 428 mg/m 3 ) and NO 2 (up to 221 mg/m 3 ), achieving high yields. Remarkably, Pd@POP‐1 also efficiently transforms CO 2 from boiler flue gas, which contains 10 vol.% CO 2 , into quinazolinones with satisfactory yields. This approach not only provides an eco‐friendly alternative for quinazolinone production by replacing phosgene with actual flue gas as a carbon source but also represents a promising strategy for the resource utilization of CO 2 in flue gas.