Well-Defined Surface Rhodium Siloxide Complexes and Their Application to Catalysis

Well-Defined Surface Rhodium Siloxide Complexes and Their Application to Catalysis 

Bogdan Marciniec, Marek J. Potrzebowski, Ireneusz Kownacki, and Karol Szubert 

Molecular versus Immobilized Transition Metal Siloxide Complexes in Catalysis 

Molecular compounds incorporating TM-O-Si bonds (where TM = transition metal) have attracted great interest owing to their wide appHcation in material science and catalysis, particularly as models of metal complexes immobihzed on silica and sihcate surfaces, which are known to catalyze various organic transformations [1-3]. 

The properties of siloxide as ancillary ligand in the system TM-O-SiRs can be effectively utilized in molecular catalysis, but predominantly by early transition metal complexes. Mono- and di-substituted branched siloxy ligands (e.g., incompletely condensed silsesquioxanes) have been employed as more advanced models of the silanol sites on silica surface for catalytically active centers of early TM (Ti, W, V) that could be effectively used in polymerization [5], metathesis [6] and epoxidation [7] of alkenes as well as dehydrogenative coupling of silanes [8]. 

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I 7 Well-Defined Surface Rhodium Siloxide Complexes and Their Application to Catalysis Table 7.5 Hydrosilylation of 1-hexadecene and allyl ethers by polyhydrosiloxane (7.1) . 

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