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Zwitterionic Iridium Complexes with P,N-Ligands as Catalysts for the Asymmetric Hydrogenation of Alkenes

Franzke, Axel and Pfaltz, Andreas. (2011) Zwitterionic Iridium Complexes with P,N-Ligands as Catalysts for the Asymmetric Hydrogenation of Alkenes. Chemistry - A European Journal, 17 (15). pp. 4131-4144.

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Official URL: http://edoc.unibas.ch/dok/A6001566

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Abstract

Several zwitterionic iridium complexes based on chiral P,N-ligands with imidazoline or oxazoline donors and anionic tetraarylborate or aryltrifluoroborate substituents have been synthesized. The corresponding cationic analogues have also been prepared, to evaluate the effect of the covalent linkage between the anion and the cationic metal complex in catalytic reactions. The respective pairs of structurally analogous precatalysts have been compared for their efficacies in the asymmetric hydrogenation of unfunctionalized olefins. In most cases, the anionic derivatization has virtually no influence on the asymmetric induction of the iridium complex. This is in accordance with X-ray structural studies, which have shown that the chiral environment of the cationic metal center is not affected by the anionic substituent. Depending on the nature of the counterion employed, the zwitterionic catalysts proved to be significantly more reactive than their cationic counterparts in nonpolar solvents.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Synthetische organische Chemie (Pfaltz)
UniBasel Contributors:Pfaltz, Andreas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Wiley
ISSN:0947-6539
e-ISSN:1521-3765
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:10 Apr 2017 09:44
Deposited On:08 Nov 2012 16:10

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