Manufacture of alpha-arylalkanoic acids and precursors
    3.
    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

    Abstract: .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.

    Abstract translation: 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。

    Method for producing esterified astaxanthin from esterified zeaxanthin
    4.
    发明授权
    Method for producing esterified astaxanthin from esterified zeaxanthin 有权
    从酯化玉米黄质生产酯化虾青素的方法

    公开(公告)号:US07291749B2

    公开(公告)日:2007-11-06

    申请号:US10685194

    申请日:2003-10-14

    CPC classification number: C07C403/24

    Abstract: A method is described for preparing astaxanthin esters from zeaxanthin by acylation of zeaxanthin with an acylating agent followed by contacting the esterified zeaxanthin with an oxidizing agent to produce esterified astaxanthin. The astaxanthin esters are more stable and show a better bioavailability than free astaxanthin when used in salmonid pigmentation.

    Abstract translation: 描述了通过用酰化剂酰化玉米黄质,然后使酯化的玉米黄质与氧化剂接触以产生酯化的虾青素从玉米黄质制备虾青素的方法。 当用于鲑鱼色素沉着时,虾青素酯比游离虾青素更稳定,显示出更好的生物利用度。

    Preparation of 4,4′-diketo-&bgr;-carotene derivatives
    5.
    发明授权
    Preparation of 4,4′-diketo-&bgr;-carotene derivatives 有权
    4,4'-二酮-β-胡萝卜素衍生物的制备

    公开(公告)号:US06372946B1

    公开(公告)日:2002-04-16

    申请号:US09953007

    申请日:2001-09-13

    CPC classification number: C07C403/24

    Abstract: A method of preparing &bgr;-carotene derivatives such as canthaxanthin and astaxanthin is described. The method employs an in situ system to generate hypobromous acid as the oxidizing agent using a salt of sulfite, hydrogen sulfite or bisulfite in combination with a bromate salt. Astaxanthin and canthaxanthin are obtained in good yield with a significantly reduced reaction time.

    Abstract translation: 描述了制备β-胡萝卜素衍生物如角黄素和虾青素的方法。 该方法采用原位系统,使用亚硫酸盐,亚硫酸氢盐或亚硫酸氢盐与溴酸盐的组合产生次溴酸作为氧化剂。 以良好的产率获得虾青素和角黄素,反应时间显着降低。

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