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H2 Activation by Heterolytic Addition

The real nature of the catalytic cycle is less documented but the H ligand appears to react very much as H  [Pg.68]

Formally, no change in the oxidation state of Ru occurs. Although hydrogenolysis of Ru(II)-alkyl to give the alkane (rate determining step) could also occur via heterolytic cleavage of H2, it more probably occurs via an oxidative addition—reductive elimination sequence. [Pg.68]

Actually, RuCl2(PPli3)3 is one of the most active homogeneous catalyst for the hydrogenation of terminal olefins (they are hydrogenated at a rate about 10 times that of the corresponding internal ones). It is also very efficient for the reduction of —NO2 to — NH2 and aldehydes to alcohols. Nitriles, esters or hahdes remain unaffected. [Pg.69]

Another system where heterolytic cleavage has been evidenced is based on anionic Pt complexes. The commercially available H2PtCl2 and SnCl2 2 H2O react in methanol to form deep red solutions that contain species such as (A). [Pg.69]

The anionic hydrido species (B) is then believed to coordinate an olefin which is then inserted into the Pt—H bond. Presumably, protonolysis promotes the cleavage of the metal—alkyl bond. [Pg.69]


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