Synthesis and Characterization of Silver and Palladium Complexes with Xanthene-Based N-Heterocyclic Carbene−Oxazoline Ligands
摘要:
We synthesized xanthenes substituted with two different donor ligand units, N-heterocyclic carbene (NHC) and oxazoline, by the sequential coupling reaction. Silver complexes 15 and 19 were prepared by the reaction between the xanthene derivatives and Ag2O. Pd complexes 16 and 20 were also synthesized by the reaction of the corresponding silver complexes with Pd(PhCN)(2)Cl-2. X-ray crystallographic analysis revealed that complexes 15-PF6, 16, and 20 adopted trans configurations, while the Ag atom of 15-Cl coordinated only to the NHC ligand.
Synthesis of Substituted Imidazolidines: Base-Stable Precursors of 4,5-Dihydro-1<i>H</i>-imidazol-3-ium Salts and<i>N</i>-Heterocyclic Carbenes
作者:Meike Egert、Sebastian Walther、Herbert Plenio
DOI:10.1002/ejoc.201402364
日期:2014.7
1-(4-bromo-2,6-diisopropylphenyl)-3-(2,6-diisopropylphenyl)imidazolidine and 1,3-bis(4-bromo-2,6-diisopropylphenyl)imidazolidine were synthesized and the 4-Br substituents converted into various functional groups through Br/Li exchange or Pd-catalyzed cross-coupling reactions (Suzuki, Sonogashira, and vinylation). The substituted imidazolidines were oxidized, by using chloranil or N-bromosuccinimide,