Method for making photocurable halofluorinated acrylates
    4.
    发明授权
    Method for making photocurable halofluorinated acrylates 有权
    制备可光固化的氟氟化丙烯酸酯的方法

    公开(公告)号:US6166156A

    公开(公告)日:2000-12-26

    申请号:US190194

    申请日:1998-11-12

    摘要: Halofluorinated alkylene monomers are made by a method comprising the steps of: (a) subjecting a first polymer which is the reaction product of a fluorinated vinyl monomer and a vinyl comonomer to dehydrohalogenation to form a second polymer; (b) treating the second polymer with an oxidizing agent to form an oxidation product consisting of a .alpha., .omega.-dicarboxylic acid or an ester derivative thereof; and (c) treating said oxidation product with a reducing agent to form a reduction product consisting of a a .alpha., .omega.-diol. Preferably, the first polymer has a structure of --[CH.sub.2 CYZ(CF.sub.2 CFX).sub.n ].sub.m -- wherein X and Y=F, Cl or Br; X and Y may be the same or different; Z=H, F, Cl, Br, alkyl or perfluoroalkyl containing from about 1 to about 10 carbon atoms; n=an integer larger than about 1; and m is an integer between about 2 and about 10.sup.5. The .alpha., .omega.-dicarboxylic acids and .alpha., .omega.-diols produced herein can be directly used as polycondensation monomers. Alternatively, the .alpha., .omega.-dicarboxylic acids and .alpha., .omega.-diols can be further derivitized to tri-, tetra- or other multifunctional alcohols which may be directly used as condensation monomers or they may be converted to acrylates which may be photocured in the presence of a radical photoinitiator into transparent polymers which are useful as optical waveguiding materials.

    摘要翻译: 通过包括以下步骤的方法制备卤代亚烷基单体:(a)使作为氟化乙烯基单体和乙烯基共聚单体的反应产物的第一聚合物进行脱卤化氢以形成第二聚合物; (b)用氧化剂处理第二聚合物以形成由α,ω-二羧酸或其酯衍生物组成的氧化产物; 和(c)用还原剂处理所述氧化产物以形成由α,ω-二醇组成的还原产物。 优选地,第一聚合物具有 - [CH 2 CYZ(CF 2 CFX)n] m - 的结构,其中X和Y = F,Cl或Br; X和Y可以相同或不同; Z = H,F,Cl,Br,含有约1至约10个碳原子的烷基或全氟烷基; n =大于1的整数; m为约2至约105的整数。本文生产的α,ω-二羧酸和α,ω-二醇可直接用作缩聚单体。 或者,可以将α,ω-二羧酸和α,ω-二醇进一步衍生为可以直接用作缩合单体的三元,四元或其它多官能醇,或者它们可以转化成丙烯酸酯,其可以在 将自由基光引发剂存在于用作光波导材料的透明聚合物中。

    Optically active .alpha.-substituted carboxylic acid derivatives and
method for producing the same
    5.
    发明授权
    Optically active .alpha.-substituted carboxylic acid derivatives and method for producing the same 失效
    光学活性α-取代羧酸衍生物及其制备方法

    公开(公告)号:US5773240A

    公开(公告)日:1998-06-30

    申请号:US750761

    申请日:1996-12-12

    摘要: The present invention relates to an optically active .alpha.-substituted carboxylic acid derivative represented by the general formula (I): ##STR1## (wherein R.sub.1 is a hydroxyl group, ##STR2## R.sub.2 is a methyl group or a chlorine atom; R.sub.3 is a hydrogen atom or an alkyl group with 1-6 carbon atoms; n is an integer of 1 or 2; and * represents an asymmetric carbon atom, provided that R.sub.2 is a chlorine atom when R.sub.1 is a hydroxyl group); and a method for producing the optically active .alpha.-substituted carboxylic acid derivative represented by the general formula (I) and antipodes thereof using a culture, cells or a material obtainable from cells of a microorganism having an ability to asymmetrically hydrolyze ester bonds. The optically active .alpha.-substituted carboxylic acid derivatives and antipodes thereof provided by the invention are useful as raw materials for various liquid crystals and as synthetic intermediates for various optically active medicines or agricultural chemicals.

    摘要翻译: PCT No.PCT / JP95 / 01176 Sec。 371日期:1996年12月12日 102(e)日期1996年12月12日PCT提交1995年6月13日PCT公布。 第WO95 / 34525号公报 日期:1995年12月21日本发明涉及由通式(I)表示的光学活性α-取代羧酸衍生物:其中R1是羟基,R2是甲基 或氯原子; R3是氢原子或具有1-6个碳原子的烷基; n是1或2的整数; *表示不对称碳原子,条件是当R1是羟基时R2是氯原子 组); 以及使用可以从具有不对称水解酯键的能力的微生物的细胞获得的培养物,细胞或材料制备由通式(I)表示的光学活性α-取代羧酸衍生物及其对映体的方法。 本发明提供的光学活性的α-取代羧酸衍生物及其对映体可用作各种液晶的原料,也可用作各种光学活性药物或农用化学品的合成中间体。