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Preparation, Reactivity, and Structural Peculiarities of Hydroxyalkyl-Functionalized "Second-Generation" Ruthenium Carbene Complexes

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Prühs,  Stefan
Research Department Fürstner, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Lehmann,  Christian W.
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Fürstner,  Alois
Research Department Fürstner, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Prühs, S., Lehmann, C. W., & Fürstner, A. (2004). Preparation, Reactivity, and Structural Peculiarities of Hydroxyalkyl-Functionalized "Second-Generation" Ruthenium Carbene Complexes. Organometallics, 23(2), 280-287. doi:10.1021/om0342006.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-96AD-F
Abstract
The preparation, immobilization, and structure of “second-generation” ruthenium benzylidene metathesis catalysts bearing hydroxyalkyl chains on their N-heterocyclic carbene ligands are described. Complexes of this type are prone to rearrange their ligand sphere such that the neutral ligands get cis- rather than trans-disposed. Moreover, treatment of complex 7d with pyridine results in an unprecedented ionization by loss of one of its chloride ligands. The resulting cationic species 13, though devoid of catalytic activity, is the first member of a new type of ruthenium carbene complexes characterized by an octahedral coordination geometry and a donor/acceptor interaction between the metal center and the tethered hydroxyl group. The trans-configured hydroxyalkyl-functionalized complexes 8a and 8b, the cis-configured compound 10, and the ion pair 13 have been structurally characterized by X-ray crystallography.