Chinese Journal of Catalysis ›› 2025, Vol. 69: 230-240.DOI: 10.1016/S1872-2067(24)60207-X

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Switching electronic effects of UiO-67-Pd using fluorinated ligands for catalytic oxidative arylation of bio-based furfuryl alcohol

Dongwen Guo, Guohui Zeng, Jinxing Long(), Biaolin Yin()   

  1. Key Laboratory of Functional Molecular Engineering of Guangdong Province, State Key Laboratory of Pulp and Paper Engineering, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2024-09-22 Accepted:2024-11-29 Online:2025-02-18 Published:2025-02-10
  • Contact: E-mail: cejxlong@scut.edu.cn (J. Long), blyin@scut.edu.cn (B. Yin).
  • Supported by:
    National Natural Science Foundation of China(22178129);Natural Science Foundation of Guangdong Province(2023A1515010771)

Abstract:

An efficient and novel approach is proposed for oxidative arylation of bio-based furfuryl alcohol (FA) to aryl furans (AFs), a versatile monomer of photoelectric materials, in the presence of UiO-67-Pd(F) with phenanthroline/ bipyridine, and poly-F substituted phenyl ligands as the mixture linkers. The results of control experiments and theoretical calculations reveal that the −F on the phenyl linkers efficiently tunes the electron-deficient nature of Pd through the Zr6 clusters bridges, which favors the adsorption and activation of the furan ring. Furthermore, the conjugation of different nitrogen-containing ligands facilitates Pd coordination for the Heck-type insertion and subsequent electrophilic palladation, respectively. As a result, the oxidative arylation of FA derivatives is substantially enhanced because of these electronic and steric synergistic effects. Under the optimized conditions, 72.2% FA conversion and 74.8% mono aryl furan (MAF) selectivity are shown in the Heck-type insertion. Meanwhile, 85.3% of MAF is converted, affording 74.8% selectivity of final product (AFs) in the subsequent electrophilic palladation reaction. This process efficiency is remarkably higher than that with homogeneous catalysts. In addition, furan-benzene polymer obtained from the halogen-free synthesis catalyzed by UiO-67-Pd(F) show significantly better properties than that from conventional Suzuki coupling method. Therefore, the present work provides a new insight for useful AFs synthesis by oxidative arylation of bio-furan via rational tunning the metal center micro-environment of heterogeneous catalyst.

Key words: Bio-based furan, Catalytic oxidative arylation, UiO-67-Pd(F) catalyst, Ligand regulation, Charge separation