Synthesis, characterization, and catalytic activity of N-heterocyclic carbene (NHC) palladacycle complexes.
Palladacycle dimers possessing bridging halides can be easily cleaved by using N-heterocyclic carbenes (NHCs) to generate novel monomeric complexes. The structure of one of these was determined by single-crystal diffraction study and consists of a square-planar coordination around the palladium center where the NHC ligand is trans to the amine of the palladacycle. The complex was found to be equally active in aryl amination and alpha-arylation of ketones even at very low catalyst loading (0.02 mol %). Primary and secondary alkyl/arylamines are equally active partners in coupling reactions. [reaction: see text]
Viciu
Mihai S
MS
Department of Chemistry, University of New Orleans, New Orleans, LA 70148, USA.
Kelly
Roy A
RA
Stevens
Edwin D
ED
Naud
Frédéric
F
Studer
Martin
M
Nolan
Steven P
SP