Patent ID: 6921735

Claim:
A composition comprising a transition metal catalyst having the following structure: wherein: 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; R 1 and R 2 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.