title: A Ru-η6-arene complex as a C-based Lewis acid in the activation of hydrogen and hydrogenation catalysis.
abstract: The PBP ligand (Ph2PC6H4)2BPh was used to prepare ((Ph2PC6H4)2B(Cl)(η(6)-Ph)RuCl (1) and subsequently [((Ph2PC6H4)2B(η(6)-Ph))RuCl][B(C6F5)4] (2). The latter species exhibited Lewis acidity on the η(6)-Ph ring, as reaction with Cy3P gave the donor-acceptor adduct [(Ph2PC6H4)2B(η(5)-C6H5-o-PCy3)RuCl][B(C6F5)4] (3). Steric frustration of this binding was seen with Mes3P, and yet the combination of 2 and Mes3P reacted with H2 to give a 2:1 mixture of 5-o and 5-p, two isomers of [(Ph2PC6H4)2B(η(5)-C6H6)RuCl] (5), along with [Mes3PH][HB(C6F5)3]. Compound 2 behaves as C-based Lewis acid and thus can also be used for catalytic hydrogenation of aldimines at room temperature via a frustrated Lewis pair mechanism.
authors.affiliation: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6.
authors.forename: Michael P
authors.initials: MP
authors.lastname: Boone
authors.forename: Douglas W
authors.initials: DW
authors.lastname: Stephan
mesh_terms: D001880:Boranes / Q000737:chemistry*; D002384:Catalysis; D018360:Crystallography, X-Ray; D006859:Hydrogen / Q000737:chemistry*; D006865:Hydrogenation; D058116:Lewis Acids / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D011789:Quantum Theory; D012428:Ruthenium / Q000737:chemistry*
chemical_list: D001880:Boranes; D058116:Lewis Acids; D009942:Organometallic Compounds; D012428:Ruthenium; D006859:Hydrogen