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Process for the separation of palladium catalyst from crude reaction mixtures of aryl acetic acids obtained by carbonylation

  • US 20060252938A1
  • Filed: 04/16/2004
  • Published: 11/09/2006
  • Est. Priority Date: 04/28/2003
  • Status: Abandoned Application
First Claim
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1. A process for the separation of palladium from a crude reaction mixture comprising aryl acetic acids of the general formula embedded image wherein Z means phenyl, napht-2-yl, 9H-fluoren-2-yl, substituted carbazol-2-yl, benzoxazol-5-yl, either of which can be substituted with H, C1-C8-alkyl or C1-C8-cycloalkyls optionally substituted with —

  • F or —

    Cl, C6-C10-aryl optionally substituted with F or Cl, OR4, COR5, —

    F, —

    Cl; and

    pyrrolyl or dehydropyrrolyl or 1-oxo-1,3-dehydro-isoindol-2-yl optionally substituted with F or Cl, OR4, COR5, —

    F, —

    Cl;

    R1 means H or C1-C4-alkyl; and

    R2, R3, R4, R5 mean independently of each other;

    H, C1-C8 alkyl, C6-C10-aryl optionally substituted with —

    F or —

    Cl, or thiophenyl;

    wherein the crude reaction mixture is obtained by palladium catalyzed carbonylation by adsorption of the palladium on a solid adsorbent, characterized in that the adsorption is carried out in the absence of a reducing agent for palladium and at a temperature, in which the crude reaction mixture is molten.

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