mu-Chlorido, mu-hydroxo-bridged dicarbonyl ruthenacycles: synthesis, structure and catalytic properties in hydrogen atom transfer

作者：Djukic Jean Pierre^*; Parkhomenko Ksenia; Hijazi Akram; Chemmi Atika; Allouche Lionel; Brelot Lydia; Pfeffer Michel; Ricard Louis; Le Goff Xavier Frederic

来源：Dalton Transactions, 2009, (15): 2695-2711.

DOI：10.1039/b820426h

mu-Chlorido, mu-hydroxo-bridged ruthenacycles containing the Ru(CO)(2) motif were synthesized by reaction of mu-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.

• 出版日期2009