Journal
ORGANOMETALLICS
Volume 31, Issue 3, Pages 1127-1132Publisher
AMER CHEMICAL SOC
DOI: 10.1021/om201166b
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- Deutsche Forschungsgemeinschaft (DFG) [SFB 623, GK 850]
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A series of three chiral, expanded six-membered NHC-palladium(II) complexes was prepared with successively increased sterical demand, while retaining natural d-(+)-camphor as a chiral motif. The catalysts showed different reaction profiles in the asymmetric, intramolecular alpha-arylation of amides. The molecular structure of two N-heterocyclic and one nitrogen acyclic carbene palladium isonitrile complex was unequivocally determined by X-ray crystallographic analysis. The results reported herein account for a correlation of catalytic activity and enantiodiscrimination in relation to the degree of chiral substitution and steric congestion at the metal center. The modular and convergent synthetic route of these air- and moisture-stable palladium isonitrile complexes underlines the usefulness of this approach.
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