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    PRODUCTION OF PENTAFLUOROBENZALDEHYDE DIALKYL ACETAL
    7.
    发明专利
    PRODUCTION OF PENTAFLUOROBENZALDEHYDE DIALKYL ACETAL 失效

    公开(公告)号：JPS6339832A

    公开(公告)日：1988-02-20

    申请号：JP18335386

    申请日：1986-08-06

    Applicant: NIPPON CATALYTIC CHEM IND

    Inventor： FUKUMOTO YOSHIYUKI ,  YATANI HIDETAKA ,  HAYASHI TOSHIO ,  MAEDA ISAMU

    IPC: B01J25/02 ,  C07B61/00 ,  C07C41/00 ,  C07C41/50 ,  C07C43/307 ,  C07C43/313 ,  C07C67/00

    Abstract: PURPOSE:To obtain the titled substance useful as an intermediate for raw material compounds of drugs and agricultural chemicals by one process and readily, by catalytically hydrogenating pentaflurobenzonitrile in the presence of a hydrogen gas, sulfuric acid and an alcohol by the use of a catalyst under a specific temperature condition and further raising the temperature to a desired temperature and heating. CONSTITUTION:Pentafluorobenzonitrile of raw material is catalytically hydrogenated in the presence of a hydrogen gas, sulfuric acid and a 1-4 Calcohol by the use of Raney nickel at 0-20 deg.C, preferably --15 deg.C. Then the temperature is successively raised to 40-100 deg.C, preferably 45-90 deg.C and heating is carried out to give the aimed compound. The sulfuric acid has >=95%, preferably >=98% purity and the amount of it used is s>=0.5 mol, preferably 1.0-3.0 mols based on the raw material. Methanol, ethanol, etc., are used as the alcohol and the amount of the alcohol is >=5 mols, preferably 5-60 mols based on a mol raw material.

    PREPARATION OF ACETAL
    9.
    发明专利
    PREPARATION OF ACETAL 失效

    公开(公告)号：JPS5855440A

    公开(公告)日：1983-04-01

    申请号：JP15213081

    申请日：1981-09-28

    Applicant: SAGAMI CHEM RES

    Inventor： SHIOJIMA ISAO ,  MATSUMOTO MASAKATSU

    IPC: C07C43/30 ,  B01J27/00 ,  B01J27/10 ,  C07B61/00 ,  C07C41/00 ,  C07C41/50 ,  C07C43/303 ,  C07C43/307 ,  C07C67/00

    Abstract: PURPOSE:To obtain the titled substance useful as perfume components, etc. easily in high yield, by using a given amount of cerium chloride catalyst in a specific proportion in reacting an aldehyde with an alcohol under specific conditions. CONSTITUTION:An aldehyde of the formula RCHO (R is alkyl, alkenyl or aryl) is reacted with an alcohol of the formula (R is lower alkyl) in the presence of a calcium or cerium chloride catalyst in an amount of 0.02-3.5wt%, preferably 1- 3wt%, based on the aldehyde, at 50-140 deg.C to give a compound of the formula. Benzaldehyde, p-chlorobenzaldehyde, etc. may be cited as the aldehyde, and a lower alcohol such as methanol may be cited as the alcohol. The reaction is preferably carried out in a solvent, e.g. alcohol or benzene.

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