Abstract
This report describes the conversion of the neutral planar chiral arene-tethered complex [Ru(η 6:η 1-Me 2NC 6H 4C 6H 4PCy 2)Cl 2 ( 1), into [Ru(η 6: η 1-Me 2NC 6H 4C 6H 4PCy 2)(1,3-dibutylimidazol-2-ylidene)Cl]BF 4 ( 2) via silver transmetallation. The cationic title complex is also chiral-at-metal, and forms stereoselectively as a result of the directing effect of the arene-tethered ligand. The structure in solution and in the solid state was examined; a puckered distortion of the η 6-arene was noted in the crystal structure, along with a hindered rotation of the NHC in solution. As a comparison to the previously reported phosphine analogues, the dication derived from 2 was used to catalyze the asymmetric Diels-Alder reaction of methacrolein and cyclopentadiene.
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