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    PROCESS FOR PREPARING 3-SUBSTITUTED 2-ALKENALS, IN PARTICULAR PRENAL
    2.
    发明公开
    PROCESS FOR PREPARING 3-SUBSTITUTED 2-ALKENALS, IN PARTICULAR PRENAL 有权
    工艺用于制备3-取代的2-链烯醛，特别是异戊烯醛

    公开(公告)号：EP2782895A1

    公开(公告)日：2014-10-01

    申请号：EP12788570.5

    申请日：2012-11-23

    Applicant: BASF SE

    Inventor： SCHAUB, Thomas ,  BRUNNER, Bernhard ,  EBEL, Klaus ,  PACIELLO, Rocco

    IPC: C07C45/00 ,  C07C35/04 ,  C07C47/20 ,  C07C47/21 ,  C07C45/29

    CPC classification number: C07C45/66 ,  C07C45/002 ,  C07C45/29 ,  C07C47/21 ,  C07C47/20

    Abstract: The present invention to a process for preparing 2-alkenals of the formula (I) in which R
    1 is selected from hydrogen and C
    1 -C
    4 -alkyl; and R
    2 is selected from hydrogen, C
    1 -C
    12 -alkyl, C
    2 -C
    12 -alkenyl, C
    4 -C
    8 -cycloalkyl and C
    6 -C-
    10 aryl, wherein C
    1 -C
    12 -alkyl and C
    1 -C
    12 -alkenyl may be substituted with C
    5 -C
    7 -cycloalkyl or C
    5 -C
    7 -cylcoalkenyl; comprising dehydrogenating an alkenol of the formula (II), an alkenol of the formula (III) or a mixture thereof, wherein R
    1 and R
    2 are each as defined above, wherein the alkenol II, the alkenol III or a mixture thereof is brought into contact with a catalytic system comprising at least one ligand and a metal compound selected from ruthenium(II) compounds and iridium(I) compounds, and wherein the hydrogen formed during the dehydrogenation is removed from the reaction mixture by: i) reaction with a reoxidant selected from C
    3 -C
    12 -alkanones, C
    4 -C
    9 -cycoalkanones, benzaldehyde and mixtures thereof; and/or ii) purely physical means.

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