Recyclable metathesis catalysts

  • US 6,921,735 B2
  • Filed: 08/09/2001
  • Issued: 07/26/2005
  • Est. Priority Date: 08/10/2000
  • Status: Active Grant
First Claim
Patent Images

1. A composition comprising a transition metal catalyst having the following structure:

  • embedded imagewherein;

    M comprises a transition metal;

    R comprises an alkyl, alkenyl, alkynyl, aryl, alkoxy, alkenyloxy, alkynyloxy, aryloxy, alkoxy carbonyl, alkylamino, alkylthio, alkylsulfonyl, alkylsulfinyl;

    each optionally substituted with an alkyl, halogen, alkoxy, aryl or heteroaryl moiety;

    R1 and R2 each comprises or together comprise, an electron withdrawing anionic ligand;

    a, b, c, and d each comprise H, a halogen atom or an alkyl, alkenyl, alkynyl, aryl, alkoxy, alkenyloxy, alkynyloxy, aryloxy, alkoxycarbonyl, alkylamino, alkylthio, alkylsulfonyl;

    alkylsulfinyl;

    each optionally substituted with an alkyl, halogen, aryl or heteroaryl moiety;

    X is oxygen, sulfur, nitrogen or phosphorus; and

    Y comprises an electron-donating heterocyclic carbene ligand.

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