Homogeneous Hydrogenation of Alkenes Catalyzed by the Ruthenium−Hydride Complex (PCy3)2(CO)(Cl)RuH: Spectroscopic Observation of the Ruthenium−Ethyl and Ruthenium−Ethylene−Hydride Intermediate Species
Organometallics1999Vol. 18(24), pp. 5152–5156
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Abstract
The ruthenium−hydride complex (PCy3)2(CO)(Cl)RuH (1a) was found to catalyze the hydrogenation of terminal and cyclic alkenes. For example, the reaction of 1-hexene with 4 atm of H2 in the presence of 1a (1-hexene:1a = 8300:1) produced the hydrogenation product 2 (TON = 12 000 h-1). The treatment of 1a with excess ethylene led to the observation of both the ruthenium−ethyl and ruthenium−ethylene−hydride species 4a and 5a, respectively. The thermodynamic parameters for the equilibria among 1a, 4a, and 5a were estimated from the VT NMR data. These results are consistent with a monohydride mechanistic pathway.
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