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Catalyst development

Kristallstruktur eines Rutheniumkomplexes mit NHC-Liganden.
Lupe

New unsymmetrical NHC-ligands have been prepared from simple starting materials. They have also been complexed to ruthenium to give new metathesis initiators. The new complexes gave significantly different E/Z ratios in cross metathesis reactions and gave improved selectivity in diastereoselective ring-closing metathesis in comparison to the corresponding Grubbs II and Hoveyda-Grubbs complexes.

K. Vehlow, S. Maechling, S. Blechert, Ruthenium Metathesis Catalyst with Saturated Unsymmetrical N-Heterocyclic Carbene Ligands, Organometallics 2006, 25, 25-28. [DOI]

D. Fischer, S. Blechert, Highly Active Silica Gel-Supported Metathesis (Pre)Catalyst, Adv. Synth. Catal. 2005, 347, 1329-1332. [DOI]

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