Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (7): 1146-1153.DOI: 10.1016/S1872-2067(11)60397-5

• Research papers • Previous Articles     Next Articles

Green and Recyclable Medium for Asymmetric Hydrogenation of Benzalacetone Catalyzed by RuCl2(TPPTS)2-(S,S)-DPENDS

QIN Ruixiang1, WANG Jinbo1,2,a, XIONG Wei1, FENG Jian1, LIU Derong1, CHEN Hua2,b   

  1. 1College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, 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:2012-03-12 Revised:2012-04-11 Online:2012-06-21 Published:2012-06-21

Abstract: PEG400-H2O was a green and recyclable reaction medium for asymmetric hydrogenation of benzalacetone catalyzed by ruthenium achiral monophosphine complex, RuCl2(TPPTS)2 (TPPTS: P(m-C6H4SO3Na)3), which was modified by (S,S)-DPENDS (disodium salt of sulfonated (S,S)-1,2-diphenyl-1,2-ethylene-diamine). Under the optimized conditions, the chemoselectivity for 4-phenyl-3-buten-2-ol was 98.5% with a corresponding ee value of 74.3%. The resulting products could easily be separated from the catalyst by extraction with n-hexane. The catalyst immobilized on PEG400-H2O could be recycled and reused at least five times without significant loss of chemoselectivity and enantioselectivity.

Key words: polyethylene glycol 400, water, asymmetric hydrogenation, water-soluble ruthenium-phosphine-diamine, benzalacetone, recycling