Patent ID: 7026495

Claim:
A method of preparing a metathesis-active metal carbene complex with a chelating carbene ligand comprising contacting the metathesis-active metal carbene complex with an internal olefin ligand precursor of the formula: wherein R 3 and R 4 are each, independently, selected from hydrogen or a substitutent selected from the group consisting of alkyl, aryl, alkoxy, aryloxy, C 2 –C 20 alkoxycarbonyl, and C 1 –C 20 trialkylsilyl, wherein each of the substituents is substituted or unsubstituted; R 5 , R 6 , R 7 , and R 8 are each, independently, selected from the group consisting of hydrogen, halogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, alkoxy, alkenyloxy, aryloxy, alkoxycarbonyl, carbonyl, alkylamino, alkylthio; alkylsulfonyl, nitrile, nitro, alkylsulfinyl, trihaloalkyl, perfluoroalkyl, carboxylic acid, ketone, aldehyde, nitrate, cyano, isocyanate, hydroxyl, ester, ether, amine, imine, amide, sulfide, disulfide, sulfonate, carbamate, silane, siloxane, phosphine, phosphate, or borate; Y is a heteroatom selected from the group oxygen (O), sulfur (S), nitrogen (N), or phosphorus (P); n is 1, in the case of a divalent heteroatom such as O or S, or 2, in the case of a trivalent heteroatom such as N or P; and Z is a group selected from hydrogen, alkyl, aryl, functionalized alkyl, functionalized aryl where the functional group(s) may independantly be one or more or the following: alkoxy, aryloxy, halogen, carboxylic acid, ketone, aldehyde, nitrate, cyano, isocyanate, hydroxyl, ester, ether, amine, imine, amide, sulfide, disulfide, carbamate, silane, siloxane, phosphine, phosphate, or borate.