Preparation of astaxanthin
    8.
    发明授权
    Preparation of astaxanthin 有权
    虾青素的制备

    公开(公告)号:US06376717B2

    公开(公告)日:2002-04-23

    申请号:US09813685

    申请日:2001-03-19

    IPC分类号: C07C4545

    CPC分类号: C07C403/24

    摘要: The present invention provides a method for preparing astaxanthin from zeaxanthin. Specifically, the present invention provides a method for said conversion using a halogenating agent with the salt of chloric or bromic acid in an inert solvent.

    摘要翻译: 本发明提供了从玉米黄质制备虾青素的方法。 具体地说,本发明提供了一种在惰性溶剂中使用卤化剂与氯酸或溴酸的盐进行所述转化的方法。

    Manufacture of alpha-arylalkanoic acids and precursors
    10.
    发明授权
    Manufacture of alpha-arylalkanoic acids and precursors 失效
    α-芳基链烷酸和前体的制备

    公开(公告)号:US4654438A

    公开(公告)日:1987-03-31

    申请号:US741655

    申请日:1985-06-05

    摘要: .alpha.-Arylalkanoic acids or esters, orthoesters or amides thereof are prepared by forming an .alpha.-hydroxy ketal or thioketal of an aryl alkyl ketone, activating the .alpha.-hydroxy substituent with an esterifying agent to form the corresponding ketal or thioketal ester substrate, wherein the ester group is sufficiently labile to non-catalytically disassociate from the substrate in a protic or dipolar, aprotic solvent, maintaining the ester substrate in contact with the protic or dipolar, aprotic solvent or mixtures thereof for a time sufficient to form the corresponding .alpha.-arylakanoic acid or ester, orthoester or amide thereof, and optionally concomitantly or sequentially hydrolyzing any ester, orthoester or amide formed to the corresponding .alpha.-arylalkanoic acid.

    摘要翻译: α-芳基链烷酸或其酯,原酸酯或酰胺通过形成芳基烷基酮的α-羟基缩酮或硫代缩酮来制备,用酯化剂活化α-羟基取代基以形成相应的缩酮或缩酮酸酯底物,其中 酯基团足够不稳定以在质子或偶极非质子溶剂中与底物非催化分离,保持酯底物与质子或偶极非质子溶剂或其混合物接触足以形成相应的α-芳基烷酸的时间 酸或酯,其原酸酯或酰胺,以及任选地伴随或依次水解形成于相应的α-芳基链烷酸的酯,原酸酯或酰胺。