Journal
ORGANOMETALLICS
Volume 28, Issue 1, Pages 289-299Publisher
AMER CHEMICAL SOC
DOI: 10.1021/om8008475
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- Institute of Bioengineering and Nanotechnology (Biomedical Research Council
- Agency for Science, Technology and Research, Singapore
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Further explorations of the catalytic potential of N-heterocyclic carbene (NHC) ligated palladacycles as catalysts for Pd-mediated transformations have been hampered by the lack of general and practical methods for their synthesis. In this work, we describe a novel, practical approach to NHC-ligated palladacycles by a three-component, one-pot reaction of imidazoliurn salts, PdCl2, and N,N-dimethylbenzylamine in the presence of excess K2CO3 under reflux in reagent-grade acetonitrile in air. 1,3-Diarylimidazolium salts afford the corresponding NHC-Pd(dmba)Cl (dmba = N,N-dimethylbenzylamine-k(2) N,C) complexes in > 80% yield. The conversion of 1,3-diaryl-4,5-dihydroimidazolium and 1,3-dialkylimidazolium or benzimidazolium salts requires the use of stronger base (Cs2CO3) and/or higher temperature (100 degrees C). The Pd-bound chloride anion can be exchanged with silver salts or sodium salts. The NHC-palladacycle adducts have been characterized by single-crystal X-ray crystallography.
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