title: A ruthenium-dihydrogen putative intermediate in ketone hydrogenation.
abstract: The compound fac-[Ru((R)-BINAP)(H)(2-PrOH)3]+ (6) (BINAP = 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl) reacts with (R,R)-dpen (dpen = 1,2-diphenylethylenediamine) under H2 at -60 degrees C in 2-PrOH-d8/CD2Cl2 to generate the cationic dihydrogen putative intermediate trans-[Ru((R)-BINAP)(H)(eta2-H2)((R,R)-dpen)]+ (2') without H-D exchange between the hydrogen ligands and the solvent. A 1H NMR study concludes that the dihydrogen ligand in 2' does not protonate 2-PrOH to a catalytically significant extent, and that 2' requires an added base or hydride source to be an active catalyst.
authors.affiliation: Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2.
authors.forename: Robin J
authors.initials: RJ
authors.lastname: Hamilton
authors.forename: Carolyn G
authors.initials: CG
authors.lastname: Leong
authors.forename: Glen
authors.initials: G
authors.lastname: Bigam
authors.forename: Mark
authors.initials: M
authors.lastname: Miskolzie
authors.forename: Steven H
authors.initials: SH
authors.lastname: Bergens