PEG400-H 2 O was a green and recyclable reaction medium for asymmetric hydrogenation of benzalacetone catalyzed by ruthenium achiral monophosphine complex, RuCl 2 (TPPTS) 2 (TPPTS: P( m -C 6 H 4 SO 3 Na) 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-H 2 O could be recycled and reused at least five times without significant loss of chemoselectivity and enantioselectivity. 在聚乙二醇 400-水绿色可循环介质中, 以手性二胺 ( S , S )-1,2-二苯基乙二胺二磺酸钠 (( S , S )-DPENDS) 与非手性钌膦络合物 ([RuCl 2 (TPPTS) 2 ] 2 ) 原位生成的水溶性钌膦二胺为催化剂, 考察了苄叉丙酮的选择性不对称加氢反应. 在优化的反应条件下, 羰基加氢产物 4-苯基-3-丁烯-2-醇的化学选择性和对映选择性分别为 98.5% 和 74.3%. 经正己烷萃取后, 催化剂即可从产物中分离出来. 循环使用 5 次后, 4-苯基-3-丁烯-2-醇化学选择性和对映选择性没有明显下降. PEG400/H 2 O was an efficient recyclable reaction medium for asymmetric hydrogenation of benzalacetone catalyzed by RuCl 2 (TPPTS)2-( S , S )-DPENDS. Utilizing this medium chemoselectivity for 4-phenyl-3-buten-2-ol was 98.5% and ee value of 74.3% was achieved. The catalyst immobilized on PEG400/H 2 O could be recycled and used repeatedly without significant loss of chemoselectivity and enantioselectivity.