Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume 2020, Issue 24, Pages 2372-2379Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.202000069
Keywords
Carbene ligands; Ruthenium; Half-sandwich complexes; Reduction; Homogeneous catalysis
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Funding
- SERB (New Delhi) [EMR/2015/001853]
- UGC-New Delhi
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Chemoselective reduction of imines to secondary amines is catalyzed efficiently by tethered and untethered, half-sandwich ruthenium N-heterocyclic carbene (NHC) complexes at room temperature. The untethered Ru-NHC complexes are more efficient as catalysts for the reduction of aldimines and ketimines than the tethered complexes. Using the best untethered complex as a catalyst, electronic and steric demands on the reaction was probed using a series of imines. Chemoselectivity of the catalyst towards imine reduction was tested by performing inter and intramolecular competitive reactions in a variety of ways. The catalyst exhibits a very high TON and TOF under anaerobic conditions.
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