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The ruthenium catalysts (PCy 3 ) 2 Ru( C(H)Ph)Cl 2 ( 1 ), (PCy 3 )Ru(IMes)( C(H)Ph)Cl 2 ( 2 ), (PCy 3 )Ru(SIMes)( C(H)Ph)Cl 2 ( 3 ), (PCyp 3 )Ru(IMes)( CHCH C(CH 3 ) 2 )Cl 2 ( 4 ), and (PCy 3 )Ru(IPr)(3-phenylindenylid-1-ene)Cl 2 ( 5 ), where IMes = 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene, SIMes = 1,3-bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazol-2-ylidene, IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene, Cy = cyclohexyl, and Cpy = cyclopentyl, have been grafted to polymer supports and found to be effective heterogeneous catalysts for ring-closing metathesis. In some cases, they are recyclable, show comparable reactivity to their homogeneous counterparts, tolerate functional groups, and perform very well with unsubstituted dienes.
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Jafarpour et al. (2002) studied this question.
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