| abstract |
The present invention relates to novel metathesis catalysts with an imidazolidine-based ligand and to methods for making and using the same. The inventive catalysts are n n n n n n n n n n wherein:n M is ruthenium or osmium; X and X 1 are each independently an anionic ligand; L is a neutral electron donor ligand; and, R, R 1 R 6 , R 7 , R 8 , and R 9 are each independently hydrogen or a substituent selected for the group consisting of C 1 C 20 alkyl, C 2 -C 20 alkenyl, C 2 -C 20 alkynyl, aryl, C 1 -C 20 alkoxycarbonyl, CI-Cm alkyithiol, aryl thiol, C 1 -C 20 alkylsulfortyl and C 1 -C 20 alkylsulfinyl, the substituent optionally substituted with one or more moieties selected from the group consisting of C 1 -C 20 alkyl, C 1 -C 10 alkoxy, aryl, and a functional group. The inclusion of an imidazolidine ligand to the previously described ruthenium or osmium catalysts has been found to dramatically improve the properties of these complexes. |