Optically active transition metal complexes. Part 123: new chiral half-sandwich ruthenium complexes, in which the arene ligand is tethered to a PN ligand

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Abstract
A concept is presented to fix the otherwise labile metal configuration in chiral half-sandwich ruthenium complexes by three-point-attachment ligands. Ligands of this type are prepared by tethering the backbone of the PN ligand 1 to a cyclopentadienyl (2) or arene system (3, 4). In half-sandwich ruthenium complexes the arene-PN ligands bind in a three-point attachment (5, 6) and in a bidentate PN coordination (7–9).

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