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General layout for modifications of ruthenium-based olefin metathesis catalysts (red: anionic ligands; green: nondissociating ligand, e.g. NHC; blue: leaving group, e.g. phosphine or pyridine; olive: carbine substituents; and dashed lines symbolise possibilities of chelation). Three commercial and frequently used catalysts (G2: Grubbs 2nd generation catalyst; M2: Neolyst M2; and 1: Hoveyda 2nd generation catalyst).
