Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (11): 1864-1873.DOI: 10.1016/S1872-2067(14)60161-3

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CuI/N4 ligand/TEMPO derivatives: A mild and highly efficient system for aerobic oxidation of primary alcohols

Shufang Zhanga,b, Chengxia Miaoa, Daqian Xua, Wei Suna, Chungu Xiaa   

  1. a State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-05-01 Revised:2014-06-03 Online:2014-11-06 Published:2014-11-06
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21103207, 21133011).

Abstract:

A new system consisting of a copper(I) complex generated in situ from a tetradentate nitrogen ligand and CuI in combination with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) derivatives was successfully developed. The system was suitable for efficient and selective aerobic oxidation of primary benzyl and allyl alcohols with a wide range of functional groups to the corresponding aldehydes at room temperature. The best result was obtained with N,N'-dimethyl-N,N'-bis(2- pyridylmethyl)ethane-1,2-diamine as the ligand and 4-OH-TEMPO as a cocatalyst in CH3CN. In addition, high-resolution mass spectrometry, ultraviolet-visible spectroscopy, and electrochemical experiments were used to provide evidence of intermediates.

Key words: Alcohol, Aerobic oxidation, Tetradentate nitrogen ligand, Copper, 2,2,6,6-tetramethylpiperidine-1-oxyl