Continuous racemization of benzylic alcohols, ethers, and esters by
solid acid catalyst
    9.
    发明授权
    Continuous racemization of benzylic alcohols, ethers, and esters by solid acid catalyst 失效
    通过固体酸催化剂连续外消旋苄基醇,醚和酯

    公开(公告)号:US5476964A

    公开(公告)日:1995-12-19

    申请号:US342460

    申请日:1994-11-21

    申请人: David W. House

    发明人: David W. House

    CPC分类号: C07C33/46 C07B55/00 C07C33/20

    摘要: Benzyl alcohols having a chiral center at the benzylic carbon can be conveniently racemized by treatment with solid acids which are strongly acidic cation exchange materials. Racemization may be effected generally in the range from 20.degree.-150.degree. C. in aqueous or partly aqueous systems in combination with a water-miscible organic solvent to improve solubility of the alcohol. Similar racemizations may be effected for benzyl ethers and esters. This process is valuable for recycling of unwanted enantiomers obtained in the resolution of racemic mixtures.

    摘要翻译: 在苄基碳上具有手性中心的苄醇可以通过用作为强酸性阳离子交换材料的固体酸处理来进行外消旋化。 外消旋化可以在水溶性或部分水性体系中通常在20-150℃范围内与水混溶性有机溶剂组合进行,以提高醇的溶解度。 苄基醚和酯可以实现类似的外消旋化。 该方法对于在拆分外消旋混合物中获得的不想要的对映异构体的再循环是有价值的。