利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

75 条记录 (耗时 0.031 秒)

    Method for racemization of optically active chrysanthemic acid or its ester
    71.
    发明授权
    Method for racemization of optically active chrysanthemic acid or its ester 失效
    旋光菊酸或其酯的外消旋化方法

    公开(公告)号：US4820864A

    公开(公告)日：1989-04-11

    申请号：US166014

    申请日：1988-03-09

    申请人： Gohfu Suzukamo ,  Yoji Sakito ,  Masami Fukao

    发明人： Gohfu Suzukamo ,  Yoji Sakito ,  Masami Fukao

    IPC分类号： C07C51/487 ,  C07C51/353

    CPC分类号： C07C51/487 ,  Y02P20/582

    摘要： Racemization of an optically active chrysanthemic acid or its ester of the formula: ##STR1## wherein R represents a hydrogen atom, an alkyl group of 1-20 carbon atoms, a cycloalkyl group of 3-20 carbon atoms or an aralkyl group of 7-20 carbon atoms and * mark indicates asymmetric carbon atom, is effected by contacting the acid or its ester with at least one compound selected from the group consisting of a carboxylic acid bromide, a silicon bromide, an S-bromine compound, and N-bromine compound, a halo-bromine compound and an SH compound in the presence of a peroxide or an azo compound.

    Process for preparing 5-ethylidene-2-norbornene
    72.
    发明授权
    Process for preparing 5-ethylidene-2-norbornene 失效
    5-亚乙基-2-降冰片烯的制备方法

    公开(公告)号：US4720601A

    公开(公告)日：1988-01-19

    申请号：US896959

    申请日：1986-08-15

    申请人： Gohfu Suzukamo ,  Masami Fukao

    发明人： Gohfu Suzukamo ,  Masami Fukao

    IPC分类号： B01J23/04 ,  C07C5/25

    CPC分类号： B01J23/04 ,  C07C5/2556

    摘要： 5-Ethylidene-2-norbornene is effectively prepared by isomerization 5-vinyl-2-norbornene in the presence of at least one catalyst selected from a group consisting of a solid base catalyst which is prepared by reacting alumina and an alkali metal hydroxide at a temperature of 200.degree. to 500.degree. C. and then reacting the reaction produce with an alkali metal at a temperature of 180.degree. to 350.degree. C. and a solid base catalyst which is prepared by reacting water-containing alumina and an alkali metal in such an amount that corresponds to a molar equivalent of water contained in alumina at a temperature in a range between a melting point of the alkali metal and 500.degree. C. and then reacting the reaction product with an alkali metal at a temperature of 180.degree. to 350.degree. C.

    摘要翻译： 5-亚乙基-2-降冰片烯通过异构化5-乙烯基-2-降冰片烯在至少一种催化剂存在下有效地制备，所述催化剂选自由以下物质制备的固体碱催化剂：氧化铝和碱金属氢氧化物 温度在200〜500℃，然后使反应生成物与碱金属在180〜350℃的温度下反应，而固体碱催化剂是通过使含水氧化铝与碱金属反应而制得的 在碱金属的熔点和500℃之间的温度范围内，氧化铝中所含的水的摩尔当量对应的量，然后使反应产物与碱金属在180〜350℃的温度下反应 DEG C.

    Method of epimerization of alkyl chrysanthemate
    74.
    发明授权
    Method of epimerization of alkyl chrysanthemate 失效
    烷基菊酯差向异构化方法

    公开(公告)号：US4473703A

    公开(公告)日：1984-09-25

    申请号：US359319

    申请日：1982-03-18

    申请人： Gohfu Suzukamo ,  Masami Fukao

    发明人： Gohfu Suzukamo ,  Masami Fukao

    IPC分类号： C07C51/487 ,  C07C67/333

    CPC分类号： C07C51/487

    摘要： A process for isomerization of cis-chrysanthemate esters by contacting a chrysanthemate ester containing a cis-chrysanthemate ester with a Lewis acid, to transform the cis-chrysanthemate ester into trans-chrysanthemate ester through epimerization at C.sub.3 -position. The starting cis-chrysanthemate ester may be of any optical isomer ratio form (+)-form to (-)-form, including racemic form. Accordingly the process is effectively employable for the preparation of a (+)-trans-chrysanthemate ester from the (+)-cis-chrysanthemate ester. Combinations of the process with optical resolution would make the commercial production of (+)-trans-chrysanthemic acid more effective, the latter being an important acid component of pyrethroidal insecticides.

    摘要翻译： 通过使含有顺式菊酸酯的菊酸酯与路易斯酸接触来顺式异构化顺式菊酸酯的方法，通过在C3位上的差向异构体将顺式菊酸酯转化为反式菊酸酯。 起始的顺 - 菊酸酯可以是（+） - （ - ） - 形式的任何旋光异构体比例，包括外消旋形式。 因此，该方法可有效地用于从（+） - 顺 - 菊酸酯制备（+） - 反 - 菊酸酯。 该方法与光学拆分的组合将使得（+） - 反式菊酸的商业生产更有效，后者是拟除虫菊酯杀虫剂的重要酸组分。