Patent ID: 8288576

Claim:
A ruthenium catalyst having the following structure I: wherein: X 1 and X 2 are the same or different and each selected from electron-withdrawing anionic ligands, wherein X 1 and X 2 may be linked to each other via carbon-carbon and/or carbon-heteroatom bonds; Y is a neutral two-electron donor selected from oxygen, sulfur, nitrogen or phosphorus; R is H, halogen atom, alkyl, alkoxy, aryl, aryloxy, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, aryloxycarbonyl, heteroaryl, carboxyl (RCO 2 â€”), cyano, nitro, amido, amino, aminosulfonyl, N-heteroarylsulfonyl, alkylsulfonyl, arylsulfonyl, alkylsulfinyl, arylsulfinyl, alkylthio, arylthio, or sulfonamido group; R 1 and R 2 are each H, Br, I, alkyl, alkoxy, aryl, aryloxy, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, aryloxycarbonyl, carboxyl, amido, amino, heteroaryl, alkylthio, arylthio, or sulfonamido group; R 3 is an alkyl, aryl, heteroaryl, alkylcarbonyl, arylcarbonyl, thiocarbonyl, or aminocarbonyl group; EWG is chloro or CO 2 Me; and L is an electron donating ligand, which may be linked to X 1 via carbon-carbon and/or carbon-heteroatom bonds.