Baratta, Walter and Chelucci, Giorgio Adolfo and Herdtweck, Eberhardt and Magnolia, Santo and Siega, Katia and Rigo, Pierluigi (2007) Highly diastereoselective formation of ruthenium complexes for efficient catalytic asymmetric transfer hydrogenation. Angewandte Chemie. International Edition, Vol. 46 (40), p. 7651-7654. eISSN 1521-3773. Article.
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Ruthenium cis-dichloro complexes with matched chiral diphosphane and aminopyridine ligands (see structure) are easily obtained by a one-pot reaction of [RuCl2(PPh3)3] with a Josiphos diphosphane and racemic 1-substituted 1-(pyridin-2- γl)methanamine ligands. These complexes are highly active catalysts for the transfer hydrogenation of ketones, affording turnover frequencies of up to 70 000 h-1 at 60 °C and ee values up to 99 %.
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