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The new hydridoruthenium complexes RuHCl(CO)(NHC)(PPh 3 ) (NHC = IMes ( 4a ), H 2 IMes ( 4b )), conveniently accessible from RuHCl(CO)(PPh 3 ) 3, exhibit high activity for hydrogenation of unactivated internal olefins and isomerization of terminal olefins. The lability of the PPh 3 ligand is fundamental to the utility of 4: where this group is replaced by the relatively nonlabile PCy 3 ligand, the activating effect of the N-heterocyclic carbene is suppressed.
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Dharmasena et al. (2005) studied this question.
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