Method for enhancing heterogeneous asymmetric selectivity and catalytic activity
    52.
    发明授权
    Method for enhancing heterogeneous asymmetric selectivity and catalytic activity 有权
    增强非对称选择性和催化活性的方法

    公开(公告)号:US09192926B2

    公开(公告)日:2015-11-24

    申请号:US13316187

    申请日:2011-12-09

    Abstract: A method for enhancing heterogeneous asymmetric selectivity and catalytic activity belongs to the field of catalytic asymmetric organic synthesis technology, the preparation method of the invention are as follows: firstly preparing the chiral L-amino acids intercalated LDHs by coprecipitation or ion-exchange method; exfoliating the chiral L-amino acids intercalated LDHs into dispersed system of chiral L-amino acids attached to the inorganic LDH nanosheets; then coordinating the L-amino acids in the above dispersed systems with the metal centers for different types of asymmetric catalytic reactions. The results show that the as-prepared catalyst can enhance the asymmetric selectivity effectively. Compared with the homogeneous counterparts under the same reaction conditions, the catalyst exhibits relatively higher yields and largely improves the selectivity of the asymmetric reaction products; and thus the chiral compounds with a higher optical purity can be obtained.

    Abstract translation: 一种增强非均相不对称选择性和催化活性的方法属于催化不对称有机合成技术领域,本发明的制备方法如下:首先通过共沉淀或离子交换法制备手性L-氨基酸插入的LDHs; 将手性L-氨基酸插入的LDH分解成附着于无机LDH纳米片的手性L-氨基酸的分散体系; 然后将上述分散系统中的L-氨基酸与用于不同类型的不对称催化反应的金属中心配位。 结果表明,所制备的催化剂可有效提高不对称选择性。 与相同反应条件下的同质物相比,催化剂的产率相对较高,大大提高了不对称反应产物的选择性; 因此可以获得具有更高光学纯度的手性化合物。

    Process for the Preparation of Nitroalcohols
    59.
    发明申请
    Process for the Preparation of Nitroalcohols 有权
    制备硝基醇的方法

    公开(公告)号:US20150038746A1

    公开(公告)日:2015-02-05

    申请号:US14379798

    申请日:2013-02-07

    CPC classification number: C07C201/12 C07C205/15

    Abstract: A process of preparing a nitroalcohol, e.g., 2-nitro-2-methyl-1-propane, from a nitropolyol, e.g., 2-nitro-2 -methyl-1,3-propanediol, the process comprising the step of contacting under hydrogenation conditions the nitropolyol with hydrogen, a hydrogenation catalyst and, optionally, a chelating agent.

    Abstract translation: 一种由硝基多元醇例如2-硝基-2-甲基-1,3-丙二醇制备硝基醇例如2-硝基-2-甲基-1-丙烷的方法,该方法包括在氢化下接触的步骤 用氢气,硝基多烯醇与氢化催化剂和任选的螯合剂进行反应。

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