4.5 Article

Copper(II) complexes supported by 8-hydroxyquinoline-imine ligands: Synthesis, characterization and catalysis in aerobic alcohols oxidation

期刊

POLYHEDRON
卷 224, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2022.115984

关键词

Copper(II) complexes; Alcohol oxidation; TEMPO

资金

  1. National Natural Science Foundation of China [21801059]
  2. Hebei Natural Science Foundation of China [B2019205087, B2019205157, B2021205007]
  3. Science and Technology Project of Hebei Education Department [ZD2022110]

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In this study, four dual-ligand coordinated copper complexes were successfully synthesized by reacting with different ligands, providing new options for catalyst research. These complexes exhibited high catalytic activity and good selectivity for the oxidation of primary and secondary alcohols.
Treatment of Cu(OAc)(2)middot4H(2)O with 8-hydroxylquinoline-imine ligands [2-(ArN = HC)-8-OH]C9H5N (Ar = 2,6-(Pr2C6H3)-Pr-i, L1H; Ar = 4-ClC6H4, L2H; Ar = 4-BrC6H4, L3H and Ar = 4-OMeC6H4, L4H) in refluxing EtOH gave the dual-ligand coordinated copper complexes [L2Cu] 1a-1d in good yields, respectively. All the four Cu complexes were characterized by IR, EPR, elemental analysis and HR-MS. Furthermore, the molecular structures of complexes 1a and 1d were further confirmed by X-ray crystallographic analysis. These complexes displayed high catalytic activity and good selectivity for aerobic oxidation of primary and secondary alcohols in the presence of TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxyl) as the co-catalyst. The yields of desired aldehydes are decent (up to 84%) and the corresponding yields of ketones are in the range of 78-91%.

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