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    METHOD FOR OPTICALLY RESOLVING ALPHA-HYDROXY ACID DERIVATIVE
    44.
    发明专利
    METHOD FOR OPTICALLY RESOLVING ALPHA-HYDROXY ACID DERIVATIVE 失效

    公开(公告)号：JPH01216954A

    公开(公告)日：1989-08-30

    申请号：JP4352488

    申请日：1988-02-26

    申请人： DAICEL CHEM

    发明人： MATSUYAMA AKIKAZU ,  NIKAIDO TERUYUKI ,  ITO MICHIO ,  KOBAYASHI YOSHINORI

    IPC分类号： C07C201/16 ,  C07B57/00 ,  C07C51/47 ,  C07C51/487 ,  C07C59/48 ,  C07C59/52 ,  C07C59/56 ,  C07C67/00 ,  C07C67/60 ,  C07C69/732 ,  C07C201/00 ,  C07C205/56

    摘要： PURPOSE:To effectively optically resolve enantiomer mixture of alpha -hydroxy acid derivative using a separating agent containing an optically active polysaccharide or derivative thereof as an active ingredient. CONSTITUTION:An enantiomer mixture of alpha-hydroxy derivative expressed by the formula (X1 and X2 are H, halogen, OH, nitro or alkyl; R is H, alkyl or phenyl; n is 1-3) is directly used without modifying OH in alpha-position or OH in alpha-position of the enantiomer mixture is modified with acyl, aralkyl, aryl, etc. Then the enantiomer mixture is optically resolved using a separating agent containing polysaccharide such as cellulose or derivative thereof as an active ingredient by a simple chromatography method. The aimed compound expressed by the formula is useful as an intermediate for medicine or organic synthesis, optical material such as liquid crystal, reagent for research, etc.

    METHOD FOR PURIFYING META-DINITRO AROMATIC HYDROCARBON
    50.
    发明专利
    METHOD FOR PURIFYING META-DINITRO AROMATIC HYDROCARBON 失效

    公开(公告)号：JPS61257950A

    公开(公告)日：1986-11-15

    申请号：JP9661085

    申请日：1985-05-09

    申请人： MITSUI TOATSU CHEMICALS

    发明人： TAKAGI USAJI ,  IKEDA KEIICHI ,  HARA RETSU ,  TSUMURA RYUICHIRO

    IPC分类号： C07C201/16 ,  C07C67/00 ,  C07C201/00 ,  C07C205/06

    摘要： PURPOSE:To remove the ortho and para isomers and separate further the meta isomer, by recrystallizing, extracting and washing crude meta-dinitro aromatic hydrocarbon, etc., with a solvent to remove partially the meta isomer, removing the solvent from the residual solution, and reacting the resultant meta-dinitro aromatic hydrocarbon containing the concentrated ortho and para isomers with an alkali or alkali salt. CONSTITUTION:A meta-dinitro aromatic hydrocarbon, expressed by formula IV and/or formula V and containing an ortho-dinitro aromatic hydrocarbon expressed by formula I and/or formula II and a para-dinitro aromatic hydrocarbon expressed by formula III as impurities is recrystallized, extracted and washed with a solvent, e.g. hexane or ethanol (which is inert to the dinitro aromatic hydrocarbons and dissolves the ortho and para isomers even a little), or treated by combination of the above-mentioned steps to separate partially the meta isomer. The solvent is then removed from the residual solution and the resultant meta-dinitro aromatic hydrocarbon containing the concentrated ortho and para isomers is reacted with an alkali or alkali salt, e.g. ammonia or sodium sulfite, to remove the ortho and para isomers. The meta isomer is further separated. USE:An intermediate for dyes, heat-resistant resins, etc.