Process for producing canthaxanthin
    23.
    发明授权
    Process for producing canthaxanthin 失效
    生产角黄素的方法

    公开(公告)号:US06313352B1

    公开(公告)日:2001-11-06

    申请号:US09590136

    申请日:2000-06-09

    IPC分类号: C07C4500

    CPC分类号: C07C403/24

    摘要: The present invention provides a process for producing canthaxanthin by mixing &bgr;-carotene with an alkali metal chlorate or an alkali metal bromate in water and an organic solvent immiscible with water; adding an iodine halide or iodide; and adding a metal iodide whereby the &bgr;-carotene is oxidized to yield canthaxanthin.

    摘要翻译: 本发明提供了一种通过将β-胡萝卜素与碱金属氯酸盐或碱金属溴酸盐在水和与水不混溶的有机溶剂中混合来生产角黄素的方法; 加入碘卤化物或碘化物; 并加入金属碘化物,由此β-胡萝卜素被氧化产生角黄素。

    Process for producing 6-methylheptan-2-one
    24.
    发明授权
    Process for producing 6-methylheptan-2-one 失效
    6-甲基庚-2-酮的制备方法

    公开(公告)号:US5840992A

    公开(公告)日:1998-11-24

    申请号:US737926

    申请日:1996-12-02

    摘要: In order to make it possible to produce 6-methylheptan-2-one, which is useful as a material for synthesizing isophytol or as a material for synthesizing fragrances such as tetrahydrolinalool and dihydrogeraniol, efficiently and in an industrially simple manner, isovaleral and acetone are subjected to aldol condensation in the presence of a basic substance to form a condensate which contains 4-hydroxy-6-methylheptan-2-one, and then the condensate is subjected to hydrogenation reaction under a dehydration condition to obtain the 6-methylheptan-2-one.

    摘要翻译: PCT No.PCT / JP96 / 00881 Sec。 371日期1996年12月2日第 102(e)日期1996年12月2日PCT 1996年4月1日PCT PCT。 公开号WO96 / 31454 日期1996年10月10日为了能够有效地以工业上简单的方式生产可用作合成异山梨醇的材料或用作合成芳香剂如四氢化萘醇和二氢胍苷的材料的6-甲基庚-2-酮 ,异戊醛和丙酮在碱性物质存在下进行醛醇缩合,形成含有4-羟基-6-甲基庚-2-酮的缩合物,然后在脱水条件下将缩合物进行氢化反应,得到 6-甲基庚-2-酮。

    2-alkoxy- or acyloxy-2-aryl-1,3-propanediol or dioxane derivative, and
process for its production
    25.
    发明授权
    2-alkoxy- or acyloxy-2-aryl-1,3-propanediol or dioxane derivative, and process for its production 失效
    2-烷氧基 - 或酰氧基-2-芳基-1,3-丙二醇或二恶烷衍生物及其制备方法

    公开(公告)号:US5500484A

    公开(公告)日:1996-03-19

    申请号:US297112

    申请日:1994-08-26

    摘要: A compound that can be converted, at a low cost and in a simple way, into 2-aryl-1,3-propanediols serving as precursors for synthesizing felbamate acting as an antiepileptic has a structure represented by Formula (1): ##STR1## wherein Ar represents an aryl group; R.sup.1 represents a hydrogen atom or is R.sup.4 or R.sup.5, where R.sup.4 represents an alkoxy group having 1 to 10 carbon atoms and R.sup.5 represents a hydroxy group or an acyloxy group having 1 to 10 carbon atoms; and R.sup.2 and R.sup.3 are hydrogen atoms at the same time or R.sup.2 and R.sup.3 together form a group represented by Formula (2): ##STR2## wherein R.sup.6 and R.sup.7 each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, or R.sup.6 and R.sup.7 together form an oligomethylene group having 2 to 10 carbon atoms.

    摘要翻译: 可以以低成本和简单的方式转化为用作合成作为抗癫痫药的纤维蛋白酸的前体的2-芳基-1,3-丙二醇的化合物具有由式(1)表示的结构: (1)其中Ar表示芳基; R1表示氢原子或R4或R5,R4表示碳原子数1〜10的烷氧基,R5表示羟基或碳原子数1〜10的酰氧基。 R2和R3同时为氢原子,R2,R3一起形成由式(2)表示的基团:其中R 6和R 7各自独立地表示氢原子或具有1〜5个碳原子的烷基 碳原子或R6和R7一起形成具有2〜10个碳原子的低聚亚甲基。