Supported transition metal complex catalysts

It is very clear that the field of supported transition metal complex catalysts is a rapidly expanding field. Indeed, only their application to hydrogenation, hydrosilylation, and hydroformylation reactions have received more than a preliminary skirmish. Already a number of points are becoming clear. 

In conclusion it is fair to say that, although supported transition metal complex catalysts have only recently been investigated, a sufficient number of encouraging results have been obtained already to allow us to predict that they clearly have an important future. 

Pis serve as catalysts for transition metal complexes. These metal eom-plexes are suitable for the epoxidation of olefins. The heterogeneous PI-supported transition metal complex catalysts provide superior catal5dic activity, selectivity and stability in the epoxidation of higher olefin. Because of the heterogeneous nature, the catalysts can be easily separated from the reaction product, which eases recycling of the catalysts." ... 

S. K. Ihm, C. G. Oh, J. H. Ahn, J. C. Kim, and D. C. Sherrington. Poly-imide-supported transition metal complex catalyst and process for preparing epoxy compounds using the same. US Patent 6063 943, assigned to Korea Advanced Institute of Science and Technology (KR), May 16,2000. 

Some general reviews on hydrogenation using transition metal complexes that have appeared within the last five years are listed (4-7), as well as general reviews on asymmetric hydrogenation (8-10) and some dealing specifically with chiral rhodium-phosphine catalysts (11-13). The topic of catalysis by supported transition metal complexes has also been well reviewed (6, 14-29), and reviews on molecular metal cluster systems, that include aspects of catalytic hydrogenations, have appeared (30-34). 

Although attempts to bind two catalysts to one support have been reported in enzyme immobilization studies (SO), there has only been one report of a similar study using supported transition metal complex... 

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