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    METHOD FOR PRODUCING C5 ACETATE
    1.
    发明专利
    METHOD FOR PRODUCING C5 ACETATE 审中-公开

    公开(公告)号：JP2002326975A

    公开(公告)日：2002-11-15

    申请号：JP2002086904

    申请日：2002-03-26

    Applicant: BASF AG

    Inventor： RHEUDE UDO ,  VICARI MAXIMILIAN ,  AQUILA WERNER ,  WEGNER GUENTER ,  NIEKERKEN JOERG

    IPC: C07C67/04 ,  C07B61/00 ,  C07C67/29 ,  C07C67/297 ,  C07C69/145

    Abstract: PROBLEM TO BE SOLVED: To improve a space time yield in a hydroformylation reaction of 3,4-diacetoxy-1-butene (3,4-DABE) for obtaining a C5 acetate for synthesizing vitamin A and to enhance the economic efficiency thereof. SOLUTION: This method is for producing the C5 acetate for synthesizing vitamin A by the hydroformylation of 3,4-DABE and characterized by using a 3,4-DABE-containing flow obtained by carrying out acetoxylation of 1,3-butadiene with acetic acid and air in the presence of a catalyst and extracting the 3, 4-DABE generated as a byproduct in the case by distillation.

    PRODUCTION OF CITRAL
    2.
    发明专利
    PRODUCTION OF CITRAL 失效

    公开(公告)号：JP2000119211A

    公开(公告)日：2000-04-25

    申请号：JP28441399

    申请日：1999-10-05

    Applicant: BASF AG

    Inventor： THERRE JOERG DR ,  KAIBEL GERD DR ,  AQUILA WERNER DR ,  WEGNER GUENTER ,  FUCHS HARTWIG

    IPC: B01J27/16 ,  C07B61/00 ,  C07C41/28 ,  C07C43/15 ,  C07C45/37 ,  C07C45/51 ,  C07C45/54 ,  C07C45/67 ,  C07C47/21 ,  C07C49/203

    Abstract: PROBLEM TO BE SOLVED: To provide a method for producing citral in a high yield by continuously distilling out formed intermediate compounds, such as prenol, as well as the citral from a reaction mixture during reactions, and heating the intermediate compounds at a specified temperature, when a specific acetal is thermally decomposed to form the prenol and the dienyl ether, and then the formed ether is subjected to Claisen rearrangement and subsequently to Cope rearrangement. SOLUTION: This method for producing citral of formula V comprises thermally decomposing (A) 3-methyl-2-buten-1-al-diprenyl acetal of formula I, if necessary, in the presence of an acidic catalyst, to form (B) prenol of formula II and (C) a compound of formula III, subjecting the formed compound of formed III to Claisen rearrangement to obtain (D) formylhexadiene of formula IV, and subsequently subjecting the obtained compound to Cope rearrangement. Therein, the characteristics comprise continuously distilling out the formed intermediate compounds of the component B, the component C and the component D as well as the objective citral from the reaction mixture during the above reactions, and heating the prenol and, if necessary, the intermediate compounds of the component C and D at 100-200 deg.C.

    3.
    发明专利
    未知

    公开(公告)号：DE50309035D1

    公开(公告)日：2008-03-06

    申请号：DE50309035

    申请日：2003-07-14

    Applicant: BASF AG

    Inventor： GOEBBEL HANS-GEORG ,  GERLACH TILL ,  WEGNER GUENTER ,  FUCHS HARTWIG ,  UNVERRICHT SIGNE ,  SALDEN AXEL

    IPC: C07C29/141 ,  C07B61/00 ,  C07C33/025

    Abstract: A process is described for selectively hydrogenating citronellal to citronellol in which a liquid phase, in which the citronellal is dissolved and particles of a catalyst are suspended which is capable of preferentially hydrogenating carbon-oxygen double bonds over carbon-carbon double bonds, is conducted through a device which inhibits the transport of the catalyst particles in the presence of a hydrogen-containing gas.

    6.
    发明专利
    未知

    公开(公告)号：DE19846056A1

    公开(公告)日：2000-04-13

    申请号：DE19846056

    申请日：1998-10-07

    Applicant: BASF AG

    Inventor： THERRE JOERG ,  KAIBEL GERD ,  AQUILA WERNER ,  WEGNER GUENTER ,  FUCHS HARTWIG

    IPC: B01J27/16 ,  C07B61/00 ,  C07C41/28 ,  C07C43/15 ,  C07C45/37 ,  C07C45/51 ,  C07C45/54 ,  C07C45/67 ,  C07C47/21 ,  C07C49/203 ,  C07C45/82

    Abstract: Preparation of citral (I) comprises thermal decomposition of 3-methyl-2-buten-1-al-diprenylacetal and rearrangement of obtained intermediates cis/trans-prenyl-(methyl-butadienyl)-ether (IV) and 2,4,4-trimethyl-3-formyl-1,5-hexadiene (V). (IV) and (V) are continuously distilled off and converted into (I) before or after removal of by-product prenol. Preparation of 3,7-dimethyl-2,6-octadien-1-al (citral) of formula (I) comprises: (1) thermal decomposition of 3-methyl-2-buten-1-al-diprenylacetal of formula (II) optionally in the presence of an acid catalyst to split off 3-methyl-buten-1-ol (prenol) of formula (III) and form cis/trans-prenyl-(methyl-butadienyl)-ether of formula (IV); (2) Claisen rearrangement of (IV) to give 2,4,4-trimethyl-3-formyl-1,5-hexadiene of formula (V); and (3) Cope rearrangement of (V) to form (I). The transitionally formed (IV) and (V) and the desired citral as well as the prenol (III) are continuously distilled out of the reaction mixture and (IV) and (V), before or after distillative separation of (III) and optional by-products, are subjected to rearrangement to form (I) at 100-200 degrees C.

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