Immobilized alkyl complex

Cationic palladium(II) complexes are homogeneous catalysts for both intramolecular and inter-molecular hydroamination reactions.267 Palladium species immobilized on silica can be prepared by the simple addition of alkyl- or hydroxopalladium(II) complexes to partially dehydroxylated silica. The silica-bound species are more stable than their molecular precursors and are efficient catalysts for the cyclization of aminoalkynes.268... 

Other important examples of immobilized palladium catalysts (48)-(50) which were employed in Heck, Suzuki-Miyaura and allylic alkylation reactions are summarized in Fig. 4.4 [123]. Catalyst (49) is particularly noteworthy as it is a recyc-able amphiphilic resin-supported P,N-chelating Pd-complex which performs asymmetric allylic alkylations in water. 

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

N-alkylation of low molecular weight N302-ligands with chloromethylated polystyrene results in immobilized Sdiiff s base structures [76] (Fig. 26). Co(II), Mn(II) and Fe(II) complexes of these bases have been investigated [76]. 

Heterogeneous diene polymerization catalysts based on modified and unmodified silica-supported lanthanide complexes are known as efficient gas-phase polymerization catalysts for a variety of support materials and activation procedures (see Sect. 9). Metal siloxide complexes M(()SiR3 )x are routinely employed as molecular model systems of such silica-immobilized/ grafted metal centers [196-199]. Structurally authenticated alkylated rare-earth metal siloxide derivatives are scarce, which is surprising given that structural data on a considerable number of alkylated lanthanide alkoxide and aryloxide complexes with a variety of substitution patterns is meanwhile available. 

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