Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (10): 2705-2710.doi: 10.3866/PKU.WHXB20100936

• CATALYSIS AND SURFACE STRUCTURE • Previous Articles     Next Articles

Selective Oxidation of Ethylbenzene with Hydrogen Peroxide Catalyzed by 5,7-Dibromo-8-quinolinolato Manganese Complexes

LU Chun-Li, FU Zai-Hui, LIU Ya-Chun, LIU Feng-Lan, QIN Jin-Wei, HE Xiang-Ling, YIN Du-Lin   

  1. Key Laboratory of Resource Fine-Processing and Advanced Materials of Hunan Province, Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research of Ministry of Education of China, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, P. R. China
  • Received:2010-02-17 Revised:2010-06-09 Published:2010-09-27
  • Contact: FU Zai-Hui E-mail:fzhhnu@tom.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20873040, 20573035).

Abstract:

Two 5,7-dibromo-8-quinolinolato manganese complexes in tetradentate (Q2MnII) and hexadentate (Q3MnIII) modes were prepared and then characterized by Fourier transform infrared (FT-IR) spectrometry. We found that both Mn complexes, together with NH4OAC and HOAc, efficiently catalyzed the oxidation of ethylbenzene to acetophenone by hydrogen peroxide in an acetone -water medium at 20 oC. Q3MnIII showed much higher catalytic activity for this reaction thanQ2MnII, affordinga 27% ethylbenzene conversion and more than 95% selectivity for acetophenone under optimum conditions.Q3MnIII was reused three times without significant deactivation, indicating good stability.

 

Key words: 5,7-Dibromo-8-guinolinolato Mn(III) complex, Hexadentate mode, Ethylbenzene, Acetophenone, Selective oxidation

MSC2000: 

  • O643