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    12.
    发明专利
    未知

    公开(公告)号：DE2928944A1

    公开(公告)日：1981-02-12

    申请号：DE2928944

    申请日：1979-07-18

    Applicant: BASF AG

    Inventor： NISSEN AXEL DIPL CHEM DR ,  KAIBEL GERD DIPL ING ,  REBAFKA WALTER DIPL CHEM DR ,  WOERZ OTTO DIPL CHEM DR ,  ARNOLD LOTHAR DIPL CHEM DR ,  BRAUN MANFRED

    IPC: C07C49/20 ,  B01J31/14 ,  C07C45/00 ,  C07C45/67 ,  C07C45/68 ,  C07C49/203 ,  C07C67/00

    Abstract: An improved process for the preparation of higher unsaturated ketones, such as geranylacetone and farnesylacetone, by reacting a beta , gamma -unsaturated alcohol and an alkyl acetoacetate at an elevated temperature in the presence of an organic aluminum compound, with elimination, and removal, of the alcohol derived from the alkyl acetoacetate in a reactor system carrying a fractionating column. The improvement in the purity, yield, and especially space-time yield of the product is achieved by starting from an alcohol having a higher boiling point than that of the alkyl acetoacetate used, carrying out the reaction in the presence of a small amount of an inert liquid which has a boiling point between that of the alkyl acetoacetate and the alcohol to be eliminated therefrom, and ensuring that the temperature at the bottom of the fractionating column is only slightly higher than the boiling point of the added liquid, under the prevailing pressure.

    16.
    发明专利
    未知

    公开(公告)号：DE2909601A1

    公开(公告)日：1980-09-25

    申请号：DE2909601

    申请日：1979-03-12

    Applicant: BASF AG

    Inventor： HORNER MICHAEL DIPL CHEM DR ,  NISSEN AXEL DIPL CHEM DR

    IPC: C07D311/72 ,  C07D311/66

    Abstract: Chromane derivatives (I) I where R1, R2 and R3 are H or C1-C8-alkyl, R4 is H, C1-C8-alkyl or C1-C8-acyl and R5 is C1-C8-alkyl are prepared by reacting a hydroquinone (II) II with a Lewis acid or a Lewis acid derivative having the same action, and with a nitrile CH2=CH-C(R5)(OR6)CN (III), where R6 is H, C1-C4-acyl or C1-C4-alkyl, or with a compound from which III is formed in situ, in the presence of an inert solvent.

    Acetal prepn. from aldehydes and alcohols - by reaction in a rectification column with distillable acid
    18.
    发明专利
    Acetal prepn. from aldehydes and alcohols - by reaction in a rectification column with distillable acid 未知

    公开(公告)号：DE2714590A1

    公开(公告)日：1978-10-05

    申请号：DE2714590

    申请日：1977-04-01

    Applicant: BASF AG

    Inventor： KAIBEL GERD DIPL ING ,  NISSEN AXEL DIPL CHEM DR

    IPC: C07C43/30

    Abstract: Prepn. of acetals by reaction of aldehydes with alcohols is carried out in the presence of a distillable acid in a reactor comprising a rectification column, the top of which is equipped with a water trap (e.g. a phase separator or reflux separator). The prods. are useful as intermediates for the prodn. of plastics, additives, perfumes and vitamins, 1,1-bis(3-methyl-2-buten-1-yloxy)-3-methyl-2-butene (I) is an intermediate for vitamins A and E. The process gives practically quantitative aldehyde conversions with high selectivity (generally >97%) for the acetal. The use of chemical additives (e.g. dehydrating agents or azeotroping solvents) is avoided. In an example, (I) is prepd. from 3-methyl-2-buten-1-al and 3-methyl-2-buten-1-ol.

    Acetal prepn. from aldehydes and alcohols - by reaction in a rectification column with distillable acid
    20.
    发明专利
    Acetal prepn. from aldehydes and alcohols - by reaction in a rectification column with distillable acid 未知

    公开(公告)号：DE2625074A1

    公开(公告)日：1977-12-08

    申请号：DE2625074

    申请日：1976-06-04

    Applicant: BASF AG

    Inventor： NISSEN AXEL DIPL CHEM DR ,  KAIBEL GERD DIPL ING

    IPC: C07C20060101 ,  C07C43/30

    Abstract: Prepn. of acetals by reaction of aldehydes with alcohols is carried out in the presence of a distillable acid in a reactor comprising a rectification column, the top of which is equipped with a water trap (e.g. a phase separator or reflux separator). The prods. are useful as intermediates for the prodn. of plastics, additives, perfumes and vitamins, 1,1-bis(3-methyl-2-buten-1-yloxy)-3-methyl-2-butene (I) is an intermediate for vitamins A and E. The process gives practically quantitative aldehyde conversions with high selectivity (generally >97%) for the acetal. The use of chemical additives (e.g. dehydrating agents or azeotroping solvents) is avoided. In an example, (I) is prepd. from 3-methyl-2-buten-1-al and 3-methyl-2-buten-1-ol.

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