Abstract
The novel cationic [RuH{PPh2(2-OMeC6H4)}2]BPh4 and neutral trans-[Ru(NH3)2{PPh2(2-OC6H4)}2] complexes were isolated from phosphine substitution reactions with [RuH(1,5-cod)(NH2NMe2)3]BPh4 and [RuCl(1,5-cod)(NH3)2(NH2NMe2)]BPh4 respectively. Ligand induced bisdemethylation of the pendent ether moieties of the phosphines occurred to give rise to the bis-phosphanylphenoxy moieties. Both complexes catalyzed the one-pot reductive amination of carbonyl compounds where excellent selectivity of aryl aldehydes over aryl ketones as precursors to the alcoholic species existed. Through substrate screening and 1H NMR studies, both steric and electronic effects of the substrates were found to influence the hydrogenation/amination mechanistic pathway, as well as direct the alcohol:amine selectivity.
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