The Preparation of a Substituted Titanocene-supported Polymer and its Application in Catalytic Reactions

Immobilization Techniques

“…For example, cyclopentadiene was immobilized to Merrifield resins to obtain titanocene complexes (Fig. The titanocene derivatives are mostly known for their high hydrogenation and isomerization activity (see also Section 42.3.6.1) [103]. The immobilization of anionic cyclopentadiene ligands represents a transition between chemisorption and the presently discussed coordinative attachment of ligands.…”

Reactions of Pentafulvene Complexes of Titanium with Carbonyl Compounds − Diastereoselective Synthesis of σ,π-Chelate Complexes with Cp~O Ligands

“…Generally, chelating Cp~O ligands can be classified as two principal types, ligands functionalized with a neutral O donor (mostly an ether group) ( A ) − forming a hemilabile ligand − and ligands with an anionic O donor ( B ) − leading to cyclopentadienylalkoxide σ,π‐chelate complexes (Scheme ). Diels−Alder reactions,2 hydrogenations,3 or the polymerization of olefins4 and dienes,5 as well as ring‐opening metathesis polymerization reactions6 are described for complexes of early transition metals exhibiting Cp~O ligands. However, in comparison to related N ‐functionalized cyclopentadienyl complexes, which proved to be remarkably successful in catalytic applications,7 the use of O ‐functionalized species still seems to be underdeveloped.…”