Stereospecific hydrolysis of optically active esters
    2.
    发明授权
    Stereospecific hydrolysis of optically active esters 失效
    光学活性酯的立体特异性水解

    公开(公告)号:US06593478B2

    公开(公告)日:2003-07-15

    申请号:US10168792

    申请日:2002-06-24

    IPC分类号: C07D30706

    摘要: A new, more efficient and highly stereospecific process is described for the preparation of compounds with general formula (R)-(I) and of absolute configuration (R), where the groups M, W, Q and Q1 are as defined in the description, starting from compounds of absolute configuration (S) by hydrolysis, in the presence of acids, of the corresponding esterified derivatives. The (R)-(I) products obtained with the process described herein are chiral synthons useful for the production of enanthiomerically pure drugs. The preparation of (R)-carnitine is also provided.

    摘要翻译: 描述了制备具有通式(R) - (I)和绝对构型(R)的化合物的新的,更有效和高度立体定向的方法,其中基团M,W,Q和Q 1如说明书中所定义 从具有相应酯化衍生物的酸存在下通过水解的绝对构型(S)化合物开始。 通过本文所述的方法获得的(R) - (I)产物是可用于生产精神药物的手性合成物。 还提供了(R) - 肉碱的制备。

    Processes for the preparation of 2-methylfuran and 2-methyltetrahydrofuran
    3.
    发明授权
    Processes for the preparation of 2-methylfuran and 2-methyltetrahydrofuran 失效
    制备2-甲基呋喃和2-甲基四氢呋喃的方法

    公开(公告)号:US06479677B1

    公开(公告)日:2002-11-12

    申请号:US09697240

    申请日:2000-10-26

    申请人: Irshad Ahmed

    发明人: Irshad Ahmed

    IPC分类号: C07D30706

    摘要: Processes are disclosed for the preparation of 2-methylfuran and 2-methyltetrahydrofuran. The continuous vapor-phase processes are commercially viable and efficient because they permit the preparation of 2-methylfuran and 2-methyltetrahydrofuran using commercially-available catalysts, namely, a reduced copper-based catalyst consisting essentially of cupric oxide, chromium (III) oxide, manganese oxide and barium chromate and a reduced nickel-based catalyst consisting essentially of nickel, nickel (II) oxide, aluminum oxide and silica. An apparatus comprising two inline hydrogenators is used for preparing the 2-methylfuran or 2-methyltetrahydrofuran.

    摘要翻译: 公开了制备2-甲基呋喃和2-甲基四氢呋喃的方法。 连续气相法是商业上可行的和有效的,因为它们允许使用市售催化剂制备2-甲基呋喃和2-甲基四氢呋喃,即基本上由氧化铜,氧化铬(III), 氧化锰和铬酸钡以及基本上由镍,氧化镍(II),氧化铝和二氧化硅组成的还原的镍基催化剂。 包括两个在线氢化器的设备用于制备2-甲基呋喃或2-甲基四氢呋喃。

    Tetrahydrofuran derivatives that can be used as detergent compositions for gasoline-type fuels
    4.
    发明授权
    Tetrahydrofuran derivatives that can be used as detergent compositions for gasoline-type fuels 失效
    可用作汽油型燃料的洗涤剂组合物的四氢呋喃衍生物

    公开(公告)号:US06339163B1

    公开(公告)日:2002-01-15

    申请号:US09637835

    申请日:2000-08-11

    IPC分类号: C07D30706

    摘要: Compositions that comprise at least one compound that corresponds to general formula (I): in which n is a number from 0 to 20; R1, R2, R3 and R4 each represent a hydrogen atom or a hydrocarbon radical, for example alkyl, with 1 to 30 carbon atoms, whereby at least one of R1, R2, R3, and R4 is a hydrocarbon radical; and m is a number from 1 to 30, can be prepared by a process that comprises the reaction of a hydroxymethylated derivative of tetrahydrofuran with ethylene oxide, then with one or more other epoxidized compounds. These compositions can be used as detergent additives for gasoline-type fuels.

    摘要翻译: 包含至少一种对应于通式(I)的化合物的组合物:其中n为0至20的数; R 1,R 2,R 3和R 4各自表示氢原子或烃基,例如具有1至30个碳原子的烷基,其中R 1,R 2,R 3和R 4中的至少一个是烃基; 并且m为1至30的数,可以通过包含四氢呋喃的羟甲基化衍生物与环氧乙烷,然后与一种或多种其它环氧化合物反应的方法制备。 这些组合物可用作汽油型燃料的洗涤剂添加剂。

    Manufacture of 3-methyl-tetrahydrofuran from 2-methyl-gamma-butyrolactone
    5.
    发明授权
    Manufacture of 3-methyl-tetrahydrofuran from 2-methyl-gamma-butyrolactone 失效
    由2-甲基-γ-丁内酯制备3-甲基 - 四氢呋喃

    公开(公告)号:US06673946B2

    公开(公告)日:2004-01-06

    申请号:US10191314

    申请日:2002-07-09

    申请人: Leo Ernest Manzer

    发明人: Leo Ernest Manzer

    IPC分类号: C07D30706

    CPC分类号: C07D307/33

    摘要: Disclosed is a hydrogenation process for the preparation of 3-methyl-tetrahydrofuran from 2-methyl-gamma-butyrolactone. The above process enables the production of the objective highly pure 3-methyl-tetrahydrofuran free from alcohol in high efficiency and high conversion through a simple production step.

    摘要翻译: 公开了从2-甲基-γ-丁内酯制备3-甲基 - 四氢呋喃的氢化方法。 上述方法能够通过简单的生产步骤以高效率和高转化率生产不含醇的目标高纯度3-甲基 - 四氢呋喃。

    Process for producing 3-hydroxy-&ggr;-butyrolactone derivatives
    7.
    发明授权
    Process for producing 3-hydroxy-&ggr;-butyrolactone derivatives 失效
    制备3-羟基-γ-丁内酯衍生物的方法

    公开(公告)号:US06268515B1

    公开(公告)日:2001-07-31

    申请号:US09582329

    申请日:2000-06-23

    IPC分类号: C07D30706

    CPC分类号: C07D307/33

    摘要: A process for preparing a 3-hydroxy-&ggr;-butyrolactone derivative represented by the following formula (1): wherein R is C1-C6 alkyl, 3 to 6-membered cycloalkyl, aralkyl, 2-alkenyl, acyl, &agr;-hydroxyalkyl, alkoxycarbonylalkyl or alkoxycarbonyl, which is characterized in treating 3-hydroxy-&ggr;-butyrolactone with a metal salt of hexamethyldisilazane and then, reacting it with an electrophilic reagent, optionally in the presence of a reaction promoter.

    摘要翻译: 一种制备由下式(1)表示的3-羟基-γ-丁内酯衍生物的方法:其中R是C 1 -C 6烷基,3至6元环烷基,芳烷基,2-烯基,酰基,α-羟基烷基,烷氧基羰基 或烷氧基羰基,其特征在于用六甲基二硅氮烷的金属盐处理3-羟基-γ-丁内酯,然后任选地在反应促进剂的存在下与亲电子试剂反应。

    Process for purifying tetrahydrofurans used as starting material for polyether polyols
    8.
    发明授权
    Process for purifying tetrahydrofurans used as starting material for polyether polyols 有权
    纯化用作聚醚多元醇原料的四氢呋喃的方法

    公开(公告)号:US06201137B1

    公开(公告)日:2001-03-13

    申请号:US09319031

    申请日:1999-08-11

    IPC分类号: C07D30706

    CPC分类号: C07D307/08

    摘要: Tetrahydrofurans suitable for use as starting materials in the synthesis of polyether polyols without causing coloration in the product polyether polyols can be obtained by contacting crude tetrahydrofurans with a mineral acid or a strongly acidic cation-exchange resin, followed by isolation through a simple distillation and/or rectification to obtain purified tetrahydrofurans.

    摘要翻译: 可以通过使粗四氢呋喃与无机酸或强酸性阳离子交换树脂接触,然后通过简单的蒸馏和/或反应产物分离来获得适合用作聚醚多元醇合成中的原料而不引起产物聚醚多元醇着色的四氢呋喃, 或精馏以获得纯化的四氢呋喃。