Abstract:
The present invention relates to novel hexacoordinated metathesis catalysts and to methods for making and using the same. The inventive catalysts are of the formula wherein: M is ruthenium or osmium; X and X are the same or different and are each independently an anionic ligand; L, L and L are the same or different and are each independently a neutral electron donor ligand; and, R and R are each independently hydrogen or a substituent selected from the group consisting of C -C alkyl, C -C alkenyl, C -C alkynyl, aryl, C -C carboxylate, C -C alkoxy, C -C alkenyloxy, C -C alkynyloxy, aryloxy, C -C alkoxycarbonyl, C -C alkylthio, C -C alkylsulfonyl and C -C alkylsulfinyl and silyl. Optionally, each of the R or R substituent group may be substituted with one or more moieties selected from the group consisting of C -C alkyl, C -C alkoxy, and aryl which in turn may each be further substituted with one or more groups selected from a halogen, a C -C alkyl, C -C alkoxy, and phenyl. Moreover, any of the catalyst ligands may further include one or more functional groups. Examples of suitable functional groups include but are not limited to: hydroxyl, thiol, thioether, ketone, aldehyde, ester, ether, amine, imine, amide, nitro, carboxylic acid, disulfide, carbonate, isocyanate, carbodiimide, carboalkoxy, carbamate, halogen, alcohol, sulfonic acid, phosphine, imide, acetal, ketal, boronate, cyano, cyanohydrin, hydrazine, enamine, sulfone, sulfide, and sulfenyl.