Ruthenium catalysts dendrimer polymers

Olefin metathesis has become a very important reaction in polymer chemistry and natural product synthesis [47-49]. Garber et al. have used the physical properties of dendrimers in order to improve the separation between the dendritic metathesis catalyst and products on silica gel column chromatography [50]. The Van Koten group has reported on the synthesis of different generations of carbosilane dendrimers functionalized with ruthenium metathesis catalysts [51]. 

A few examples of polymer supported olefin metathesis have been reported recently. Hoveyda formed styrenyl ether complexes of several ruthenium-based olefin metathesis catalysts that were then incorporated into a dendrimer structure (273) (Scheme 23), reporting good conversions over 6 cycles albeit with diminishing ruthenium content. Yao used a similar chelating ligand to incorporate olefin... 

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