Immobilized cyclopentadienyl complex

Immobilization of Rare-Earth Metal Hydride, Alkyl, and Cyclopentadienyl Complexes... 

The preparation of sihca- and polymer-supported cyclopen-tadienyl groups is discussed above. These modified solids can be used to generate a wide variety of immobilized metal complexes. Reaction of a cyclopentadienyl-modified polystyrene with (C5H5)TiCl3 yields supported titanocene dichloride (equation 11). 

Schumann, H., Hasan, M., Gelman, F., Avnir, D., and Blum, J. (1998) Synthesis immobilization and catalytic activity of some silylated cyclopentadienyl complexes. Inorg. Chim. Acta, 280 (1-2), 21-25. 

The cyclopentadienyl group is another interesting ligand for immobilization. Its titanium complexes can be transformed by reduction with butyl lithium into highly active alkene hydrogenation catalysts having a TOF of about 7000 h 1 at 60 °C [85]. Similar metallocene catalysts have also been extensively studied on polymer supports, as shown in the following section. 

Cyclopentadienyl groups can be incorporated in a manner similar to that shown in eqnation(4) for phosphines. Metallocene derivatives (see Metallocene Complexes),mtani, can be incorporated into these modified polymers. Also, chiral phosphines such as DIOP and BINAP have been immobilized on polymers to be used in asyimnetric hydrogenation catalysis and related reactions. ... 

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