High-loading Polystyrene Hybrid Supports

A general problem in solid-phase catalysis is the low loading capacities of the commonly used solid phase resins. Often, large quantities of resin are required in order to support substantial amounts of catalyst. Even though several linear graft polymers with high loading capacities ( -S mmol g 0 have been prepared, 

Although the emerging characteristics of the dendritic supported catalysts hold promise for the improvement of immobilised catalytic systems, there is a serious problem impeding the investigation and development of such systems. The synthesis of dendritic molecules is a time- and effort-consuming process. 

Recently, Haag and coworkers reported on the synthesis of polystyrene beads dendronised with a hyperbranched polymer [66, 67]. The polystyrene-polyglycerol hybrid support 5 was obtained by grafting of a hyperbranched polyglycerol directly onto a Merrifield resin [67] or alternatively polymerising glycidol directly onto a polyhydroxylated crosslinked polystyrene 

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