Chiral, Sterically Demanding N-Heterocyclic Carbenes Fused into a Heterobiaryl Skeleton: Design, Synthesis, and Structural Analysis
摘要:
A series of Cu(I), Ag(I), and Au(I) complexes incorporating a new family of imidazopyridin-3-ylidene ligands substituted by a diphenylpyrrolidino group at N(1) and aryl groups at C(5) has been synthesized and their structures determined by X-ray diffraction analysis. This structural study has revealed an extremely high steric protection of the metal center by the bulky heterobicyclic carbenes, while the inversion at the exocyclic N(sp(3)) atom provides a remarkable flexibility.
Bulky Picolyl Substituted NHC Ligands and Their Pd
<sup>0</sup>
Complexes
作者:Stefan Warsink、Carien M. S. van Aubel、Jan J. Weigand、Shiuh‐Tzung Liu、Cornelis J. Elsevier
DOI:10.1002/ejic.201000768
日期:2010.12
Heterobidentate N-heterocyclic carbene-picolyl ligands with various substitution patterns and their palladium(0) complexes have been synthesized in excellent yields via their corresponding silver(I) complexes. These complexes are among the first examples where substitution next to the coordinating nitrogen is evaluated systematically. The complexes have been studied by NMR and X-ray diffraction, confirming