Ruthenium(0) Catalyzed Isomerization of Allylbenzene. The Detection and Isolation of A Hydrido-η3-Allyl Intermediate |
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Authors: | Edward O Sherman Merle Olson |
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Institution: | Department of Chemistry, University of Western Ontario, London, Ontario Canada |
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Abstract: | Allylbenzene is isomerized to - and -β-methylstyrene at 35–60°C in the presence of (C6H5)3P]4Ru(π-CH3CN)·CH3CN. Two hydrido-η3-1-phenylallyl ruthenium complexes have been detected by proton nmr spectroscopy during the reaction and the predominant one of formula (C6H5)3P]2RuH(η3-C3H4C6H5)(CH3CN) has been isolated. The structure of this intermediate contains cis phosphines, mutually trans hydrido and acetonitrile ligands and the 1-phenylallyl ligand in a -configuration. A similar structure with an -configuration of the 1-phenylallyl ligand is suggested for the other detected intermediate. These complexes indicate that this isomerization is initiated by oxidative-addition of ruthenium(0) to an allylic C-H bond with the formation of distinct η3-allyl metal hydride species as has been proposed in a number of metal catalyzed olefin transformations. |
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