Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (7): 1154-1160.DOI: 10.1016/S1872-2067(11)60403-8

• Research papers • Previous Articles     Next Articles

(1S,2S)-Diphenylethylenediamine Modified Ir/SiO2 Catalyst for Asymmetric Hydrogenation of Acetophenone and Its Derivatives

YANG Chaofen1, YANG Jun1, SUN Xiaodong1, ZHU Yanqin1, WANG Qi1, CHEN Hua2,*   

  1. 1Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, Yunnan, China; 2Key Laboratory of Green Chemistry and Technology, Ministry of Education, Institute of Homogeneous Catalysis, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
  • Received:2012-02-28 Revised:2012-04-12 Online:2012-06-21 Published:2012-06-21

Abstract: An efficient and highly dispersed 5%Ir/SiO2 catalyst for the asymmetric hydrogenation of acetophenone and its derivatives were prepared under basic conditions without the use of any stabilizer. The effects of different reaction parameters, namely, catalyst preparation, base used, chiral modifier, and concentration of (1S,2S)-diphenylethylenediamine ((1S,2S)-DPEN), were evaluated. Under optimum conditions with 5%Ir/SiO2 modified by (1S,2S)-DPEN, a high ee value of 70.0% was obtained for the asymmetric hydrogenation of acetophenone. It is noteworthy that this highest ee value was obtained with a supported metal catalyst without any stabilizer. The catalyst preparation is simple and there was no loss of enantioselectivity when the catalyst was reused several times.

Key words: iridium, acetophenone, heterogeneous asymmetric hydrogenation, (1S,2S)-diphenylethylenediamine, enantioselectivity