Application of potassium-modified carbon nitride as a highly efficient recyclable catalyst for synthesis of 4H-chromene derivatives

• Published in: Research on chemical intermediates Vol. 48; no. 1; pp. 307 - 320
• Main Authors: Chen, Yu-Xuan, Di, Jia-Qi, Geng, Shan-Shan, Zhang, Zhan-Hui
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 2022; Springer Nature B.V
• Subjects: Carbon; Carbon nitride; Catalysis; Catalysts; Catalytic activity; Chemical synthesis; Chemistry; Chemistry and Materials Science; Cyclohexane; Electron microscopes; Ethyl lactate; Infrared spectroscopy; Inorganic Chemistry; Photoelectrons; Physical Chemistry; Potassium; Room temperature; Spectrum analysis; X ray photoelectron spectroscopy; X ray powder diffraction; Heterogeneous catalyst; Multi-component reactions; 4; chromene; Potassium-doped carbon nitride
• ISSN: 0922-6168; 1568-5675
• DOI: 10.1007/s11164-021-04566-9

A potassium-doped carbon nitride (K-CN) was prepared by a simple thermal polymerization method. The prepared K-CN was characterized by Fourier infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS) techniques. The obtained K-CN exhibited excellent catalytic activity for synthesis of 4 H -chromene derivatives via one-pot three-component reaction of salicylaldehyde, cyclohexane-1,3-diones and 4-hydroxycoumarin in water/ethyl lactate at room temperature. The reported method shows significant advantages, such as high yield, mild and clean reaction conditions, the use of recyclable catalyst and ethyl lactate/water as an environmentally friendly solvent, multi-component reaction at room temperature, no chromatographic separation and suitable for large-scale synthesis.