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    PRODUCTION OF KETO-ACID
    5.
    发明专利
    PRODUCTION OF KETO-ACID 失效

    公开(公告)号：JPH10226672A

    公开(公告)日：1998-08-25

    申请号：JP269398

    申请日：1998-01-09

    Applicant: CIBA GEIGY AG

    Inventor： TAYLOR JAMES PHILIP ,  WALKER WILLIAM ,  WHITWORTH JOHN ,  HENEGHAN MICHAEL

    IPC: C07D295/08 ,  C07C227/16 ,  C07C227/18 ,  C07C227/44 ,  C07C229/52 ,  C07C229/66 ,  C07D207/08 ,  C07D211/14

    Abstract: PROBLEM TO BE SOLVED: To produce a keto-acid that is useful as an intermediate for production of fluoran compounds used as pressure- or heat-sensitive recording dyestuffs by reading a specific m-aminophenol with phthalic anhydride in an organic solvent at a low cost in an economical aspect as well as in the aspect of environmental preservation by the use of a small quantity of the solvent. SOLUTION: This keto-acid of formula II (e.g. 4-N,N-dibutylamino-2- hydroxy-2'-carboxybenzophenone) is produced by reacting an m-aminophenol of formula I [R1 and R2 are each a 1-18C alkyl, 4-8C (substituted) cycloalkyl, etc.] (e.g. N,N-di-n-butylaminophenol) with phthalic anhydride in a quantity of 0.5-20mol to 1mol of the m-aminophenol in an organic solvent (e.g. toluene) in a quantity of less than 0.5 pt.wt. to 1 pt.wt. of the m-aminophenol at 60-120 deg.C for 3-40hr., and cooling the resultant mixture to 0-60 deg.C.

    PRODUCTION OF BENZOIC ACID DERIVATIVE
    7.
    发明专利
    PRODUCTION OF BENZOIC ACID DERIVATIVE 失效

    公开(公告)号：JPH01261355A

    公开(公告)日：1989-10-18

    申请号：JP8724488

    申请日：1988-04-11

    Applicant: NIPPON KAYAKU KK

    Inventor： NOMURA MASAHARU ,  NIIMOTO HARUKI ,  KAWAHARA KENICHI ,  HAYASHIBARA SHOICHI

    IPC: C07C229/66 ,  C07C67/00 ,  C07C227/00 ,  C07C227/02 ,  C07D209/44 ,  C07D295/14

    Abstract: PURPOSE:To readily obtain the subject compound useful as an intermediate for heat-sensitive coloring matters, etc., in high yield and purity, by treating a specific isoindolinone compound with an oxidizing agent in the presence of an alkali. CONSTITUTION:An isoindolinone compound expressed by formula I (R1, R2, R5 and R6 are H, alkyl, alkoxyalkyl, haloalkyl, allyl, etc.; R3 is H, halogen or alkyl; R4 is H, alkyl, phenyl or acyl) is treated with an oxidizing agent, such as hypohalite or hydrogen peroxide, in the presence of an alkali, such as NaOH or KOH, to afford a benzoic acid derivative expressed by formula II. The reaction is carried out at 40-200 deg.C, preferably 80-150 deg.C temperature. A heat- or pressure-sensitive dye can be obtained by the above-mentioned method without normally requiring operation, such as purification.

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