title: Micro-chlorido, micro-hydroxo-bridged dicarbonyl ruthenacycles: synthesis, structure and catalytic properties in hydrogen atom transfer.
abstract: Micro-chlorido, micro-hydroxo-bridged ruthenacycles containing the Ru(CO)2 motif were synthesized by reaction of micro-dichlorido-bridged congener complexes with water in the presence of disodium carbonate. The substitution of one chlorido ligand for one hydroxo occurs with high stereoselectivity affording essentially hydroxo-bridged ruthenacycles, whereby the OH ligand occupies axial positions with respect to the mean plane defined by the chelating ligand. According to computational DFT investigations this stereoselectivity stems from a marked transphobia of the hydroxo ligand towards the carbanion of the ruthenacycle. The catalytic properties of the title compounds in hydrogen atom transfer process and particularly in the partial hydrogenation of alkynes have been investigated.
authors.affiliation: Institut de Chimie, CNRS, Université de Strasbourg, 4, rue Blaise Pascal, 67000, Strasbourg, France. djukic@chimie.u-strasbg.fr
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Djukic
authors.forename: Ksenia
authors.initials: K
authors.lastname: Parkhomenko
authors.forename: Akram
authors.initials: A
authors.lastname: Hijazi
authors.forename: Atika
authors.initials: A
authors.lastname: Chemmi
authors.forename: Lionel
authors.initials: L
authors.lastname: Allouche
authors.forename: Lydia
authors.initials: L
authors.lastname: Brelot
authors.forename: Michel
authors.initials: M
authors.lastname: Pfeffer
authors.forename: Louis
authors.initials: L
authors.lastname: Ricard
authors.forename: Xavier-Frédéric
authors.initials: XF
authors.lastname: Le Goff