Chiral, Sterically Demanding N‑Heterocyclic
Carbenes Fused into a Heterobiaryl Skeleton: Design, Synthesis, and
Structural Analysis
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Abstract
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<sup>3</sup>) atom provides a remarkable flexibility
