Phosphine donor ligands, immobilized

Functionalization through phosphine moieties has been preferred as they form strong bonds with Rh. However other donor ligands have also been used for immobilizing metal complexes. For example, styrene-divinylbenzene... 

Functionalized polymers incorporating neutral, metal binding ligands such as phosphine were prepared as early as 1959 (Rabinowitz and Marcus, 1961 Issleib and Tzschach, 1959). After Merriheld introduced the concept of solid-phase synthesis, the basic idea of using polymer-immobilized transition metal complexes as catalysts burgeoned, and many more polymeric supports containing neutral donor ligands have been prepared. 

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