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(a) Selected ruthenium-based catalysts for olefin metathesis and the neutral ligands. (b) trans- and cis-dichlorido S-chelated Ru benzylidene complexes and the influence of the S substituent on the reactivity. (Mes = mesityl (2,4,6-trimethylphenyl), DIPP = 2,6-diisopropylphenyl, NHC = N-heterocyclic carbene, SIMes =1,3-bis-mesityl-2-imidazolidin-2-ylidene, SIPr = 1,3-bis-(2,6-triisopropylphenyl)-2-imidazolidinylidene).
