Bimetallic catalysts benzene hydrogenation

Studies of benzene hydrogenation over bimetallic catalysts are of limited value in illuminating reaction mechanism except when conducted with deuterium, when comparison of exchange with addition is informative (Section 10.2.6) otherwise what is found is more relevant to the understanding of how bimetallic systems behave, and how their composition determines their activity. 

Bimetallic complexes, such as RuPt(CO)5(PPh3)3, have been immobilized on phosphinated poly(styrene-divinyl-benzene) by a similar hgand-substitution reaction (equation 10). The resulting supported bimetallic complexes have been characterized by IR spectroscopy and are found to act as ethylene Hydrogenation catalysts. 

The complex [(OC)4Fe(//-PPh2)Pd( -Cl)]2 is a selective catalyst for the isomerization of 1-octene to 2-octene and the hydrogenation of 1-hexyne in the presence of 1-hexene. At 448 K, under 100 atm H2, 93% of a sample of 1-hexyne in benzene was reduced to hexene and only 3% to hexane. This is unexpected because palladium is usually an excellent catalyst for the hydrogenation of olefins. It also catalyzes the carbonylation of 1-octene under mild conditions (348 K, 50 atm). The total yield of esters was ten times greater than with [PdCl2(PPh3)2] as a catalyst. This bimetallic complex was also an effective catalyst for the carbonylation of 1,5-cyclooctadiene. ... 

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