Journal article
Ruthenium(II) supported by phosphine-functionalized N-heterocyclic carbene ligands as catalysts for the transfer hydrogenation of ketones
Inorganic chemistry communications, Vol.37, pp.138-143
11/01/2013
DOI: 10.1016/j.inoche.2013.09.046
Abstract
We have prepared and characterized two ruthenium(II) complexes supported by phosphine-functionalized N-heterocyclic (NHC) ligands. One of the complexes (2a) underwent ortho-metalation of the N-phenyl moiety giving rise to a tridentate PCNHCC− coordinating ligand whereas 2b bears an N-mesityl group in order to prevent C–H activation of the aryl ring thereby enforcing a PCNHC bidentate binding mode. Both 2a and 2b were shown to catalyze transfer hydrogenation of ketones at 82°C in 2-propanol in the presence of KOtBu albeit with vastly different catalytic activities. Catalytic transfer hydrogenation by 2b was shown to proceed at room temperature and in air using unpurified 2-propanol as solvent and hydrogen donor. Time studies revealed unique kinetic profiles for the two precatalysts; this may shed light on the difference in their catalytic activities.
Two ruthenium(II) complexes supported by phosphine-functionalized N-heterocyclic carbene ligands have been prepared, characterized and evaluated as catalysts for transfer hydrogenation of ketones. [Display omitted]
•Unexpected ortho-metalation led to a ruthenium(II)–PCNHCC− complex.•ortho-Metalated catalyst exhibits slow initiation kinetics.•Catalyst derived from ruthenium(II)–PCNHC complex is active at room temperature and in air using unpurified solvent.
Details
- Title: Subtitle
- Ruthenium(II) supported by phosphine-functionalized N-heterocyclic carbene ligands as catalysts for the transfer hydrogenation of ketones
- Creators
- Matthew E. Humphries - Augustana CollegeWiktoria H. Pecak - Augustana CollegeSallie A. Hohenboken - Augustana CollegeSamuel R. Alvarado - Augustana CollegeDale C. Swenson - University of IowaGregory J. Domski - Augustana College
- Resource Type
- Journal article
- Publication Details
- Inorganic chemistry communications, Vol.37, pp.138-143
- Publisher
- Elsevier B.V
- DOI
- 10.1016/j.inoche.2013.09.046
- ISSN
- 1387-7003
- eISSN
- 1879-0259
- Language
- English
- Date published
- 11/01/2013
- Academic Unit
- Chemistry
- Record Identifier
- 9984622048602771
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