Yunbo Qian, Xin Zheng, Xu Wang, Shiyong Xiao and Yongmei Wang. An Efficient Ionic Liquid Additive for Proline-catalyzed Direct Asymmetric Aldol Reactions between Cyclic Ketones and Aromatic Aldehydes. Chemistry Letters, 2009, 38, (6), 576.
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http://dx.doi.org/10.1246/cl.2009.576
