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Styrene as ligand and support: An excellent polymer-supported ruthenium catalyst 1 has been developed in which the benzene rings of polystyrene are utilized as ligands to immobilize the ruthenium onto the polymer. In the presence of 1, ring-closing olefin metathesis proceeded smoothly to afford adducts in high yields. Furthermore, the catalyst was recovered quantitatively by filtration, and could be reused without loss of activity.
Akiyama et al. (2002) studied this question.