Arylgold(I) Complexes
from Base-Assisted Transmetalation:
Structures, NMR Properties, and Density-Functional Theory Calculations
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Abstract
The synthesis of gold(I) complexes of the type LAuR (L
= PCy<sub>3</sub>, IPr; R = aryl; IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene)
starting from LAuX (X = Br, OAc) and boronic acids in the presence
of Cs<sub>2</sub>CO<sub>3</sub> has been investigated. The reactions
proceed smoothly in good to excellent yields over the course of 24–48
h in isopropyl alcohol at 50–55 °C. The aryl groups include
a variety of functionalities and steric bulk, and in two cases, are
heterocyclic. All of the products have been characterized by multinuclear
NMR spectroscopy and elemental analysis and most by X-ray crystallography.
This work affirms that, almost without exception, base-assisted auration
is a useful and reliable way to form gold–carbon bonds
