TY - JOUR AU - Sonderegger, Otmar J. AU - Bürgi, Thomas AU - Baiker, Alfons TI - Asymmetric hydrogenation of cyclohexane-1,2-dione over cinchonidine modified platinum PY - 2003 JF - Journal of Catalysis JA - J. Catal. SN - 0021-9517 VL - 215 IS - 1 SP - 116 EP - 121 L1 - http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WHJ-47VYKV7-K-2H&_cdi=6852&_user=9565874&_pii=S0021951702001446&_origin=search&_coverDate=04%2F01%2F2003&_sk=997849998&view=c&wchp=dGLzVlb-zSkzk&md5=bce98e3627724a0f8d7e76f64d7dad7a&ie=/sdarticle.pdf L2 - http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WHJ-47VYKV7-K&_user=9565874&_coverDate=04%2F01%2F2003&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_acct=C000043220&_version=1&_urlVersion=0&_userid=9565874&md5=75f33df3b97217f6dc43b1d47a47b7d6&searchtype=a L4 - http://www.unige.ch/sciences/chifi/publis/pics/double/ref01126.png M3 - 10.1016/S0021-9517%2802%2900144-6 UR - http://dx.doi.org/10.1016/S0021-9517%2802%2900144-6 N2 - The asymmetric hydrogenation of cyclohexane-1,2-dione over cinchonidine-modified platinum was investigated. Despite the fact that the first hydrogenation step is close to nonenantioselective, a high enantiomeric excess is obtained for the (R)-α-hydroxyketone due to kinetic resolution. In the second hydrogenation step one out of the four reactions of the network is substantially accelerated with respect to the others and with respect to the reaction in the absence of modifier, leading to an enantiomeric excess of (1R,2R)-trans-cyclohexane-1,2-diol of over 80%. Comparison with recently reported asymmetric hydrogenation of α-hydroxyethers indicates striking similarities, which hint at similar reactant–modifier interaction in both cases. The importance of cis versus trans conformation of the reactant for the reactant–modifier interaction emerges from a comparison of suggested reaction intermediates for cyclohexane-1,2-dione and butane-2,3-dione hydrogenation, respectively. ID - 1126 ER -