Hexacoordinated ruthenium or osmium metal carbene metathesis catalysts, their preparation and use in polymerization of olefins.
. California Institute of Technology; 2003.
The title catalysts are LL1'L2XX1M:(C:CR1R) or LL1'L2XX1M:(C:C:CR1R) where M = Ru or Os; X and X1 = anionic ligand; L, L1' and L2 = neutral electron donor ligand; and, R and R1 = H or a substituent selected from C1-20 alkyl, C2-C20 alkenyl, C2-C20 alkynyl, aryl, C1-C20carboxylate, C1-C20 alkoxy, C2-C20 alkenyloxy, C2-C20 alkynyloxy, aryloxy, C2-C20 alkoxycarbonyl, C1-C20 alkylthio, C1-C20 alkylsulfonyl and C1-C20 alkylsulfinyl and silyl. Optionally, each of the R or R1 substituent groups may be substituted with ≥1 moieties selected from C1-10 alkyl, C1-10 alkoxy, and aryl which in turn may each be further substituted with ≥1 groups selected from a halogen, a C1-5-alkyl, C1-5-alkoxy, and Ph. Example electron donor ligands, e.g. N-heterocyclic carbene ligand, have functional groups including hydroxyl, thiol, thioether, ketone, aldehyde, ester, ether, amine, imine, amide, nitro, carboxylic acid, disulfide, carbonate, isocyanate, carbodiimide, carboalkoxy, carbamate, halogen, alc., sulfonic acid, phosphine, imide, acetal, ketal, boronate, cyano, cyanohydrin, hydrazine, enamine, sulfone, sulfide, and sulfenyl. In certain embodiments, ≥1 of L, L1, and L2 is an N-heterocyclic carbene ligand. [on SciFinder(R)]