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    • 53. 发明授权
    • Process for preparing cis-chrysanthemic acid
    • 顺式菊酸的制备方法
    • US3989654A
    • 1976-11-02
    • US500018
    • 1974-08-23
    • Toshiko HondaNobushige ItayaAkio HigoFukashi Horiuchi
    • Toshiko HondaNobushige ItayaAkio HigoFukashi Horiuchi
    • C07C61/04
    • A novel process for preparing cis-chrysanthemic acid comprising (1) hydrolysis of trans-.delta.-halogenodihydrochrysanthemic acid or ester thereof under neutrally kept condition with an alkaline earth metal carbonate, (2) conversion of the obtained trans-.delta.-hydroxydihydrochrysanthemic acid ester into a mixture of cis-chrysanthemic acid and iso-cis-chrysanthemic acid by reacting with a strong base, and (3) separation of the cis-chrysanthemic acid from the mixture by selective conversion of the iso-cis-chrysanthemic acid with water in the presence of an acid catalyst into cis-dihydrochrysanthemolactone, followed by separation of the cis-chrysanthemic acid from the lactone with a caustic alkali and an acid.The present process is very useful for converting (-)-trans-chrysanthemic acid which is obtained, as a main remainder of racemic chrysanthemic acid prepared industrially, after (+)-trans-chrysanthemic acid was used for preparation of (+)-trans-chrysanthemic acid ester having a high insecticidal activity, into (+)-cis-chrysanthemic acid which is industrially valuable for preparation of insecticides.
    • 一种制备顺式菊酸的新方法,其包括:(1)在中性保持条件下用碱土金属碳酸盐水解反式δ-卤代二氢菊酸或其酯,(2)将所得反式δ-羟基二氢菊酸酯转化为 通过与强碱反应,顺式 - 菊酸和异顺式菊酸的混合物,和(3)通过选择性地将异顺式菊酸与水分离,从而将顺式菊酸与混合物分离 将酸催化剂存在于顺式二氢菊花内酯中,然后用苛性碱和酸从内酯中分离顺式菊酸。
    • 60. 发明授权
    • Process for preparing 4'-methyl-2-cyanobiphenyl
    • 制备4'-甲基-2-氰基联苯的方法
    • US5892094A
    • 1999-04-06
    • US996341
    • 1997-12-22
    • Tadashi KatsuraHiroshi ShirataniKiyoshi SugiNobushige Itaya
    • Tadashi KatsuraHiroshi ShirataniKiyoshi SugiNobushige Itaya
    • C07C253/30C07C255/50C07C255/00
    • C07C253/30
    • Process for preparing 4'-methyl-2-cyanobiphenyl, comprising, catalytically hydrogenating at least one brominated cyanobiphenyl compound selected from 4'-dibromomethyl-2-cyanobiphenyl and 4'-bromomethyl-2-cyanobiphenyl; and process for regenerating 4'-methyl-2-cyanobiphenyl, comprising, catalytically hydrogenating at least one brominated cyanobiphenyl compound selected from 4'-dibromomethyl-2-cyanobiphenyl and 4'-bromomethyl-2-cyanobiphenyl, contained in a filtrate prepared by brominating 4'-methyl-2-cyanobiphenyl in a solvent; crystallizing 4'-bromomethyl-2-cyanobiphenyl from the resulting reaction mixture; and removing the resulting crystals from the reaction mixture by filtration. 4'-Methyl-2-cyanobiphenyl can be used as starting materials for 4'-bromomethyl-2-cyanobiphenyl.
    • 制备4'-甲基-2-氰基联苯的方法,包括催化氢化至少一种选自4'-二溴甲基-2-氰基联苯和4'-溴甲基-2-氰基联苯的溴代氰基联苯化合物; 以及用于再生4'-甲基-2-氰基联苯的方法,包括催化氢化选自4-溴 - 二溴甲基-2-氰基联苯和4'-溴甲基-2-氰基联苯中的至少一种溴化氰基联苯化合物,其包含在通过溴化制备的滤液中 4'-甲基-2-氰基联苯; 从所得反应混合物中结晶出4'-溴甲基-2-氰基联苯; 并通过过滤从反应混合物中除去所得晶体。 4'-甲基-2-氰基联苯可用作4'-溴甲基-2-氰基联苯的原料。