An N-Heterocyclic Carbene Ligand with an Oxalamide Backbone

作者：Braun Markus; Frank Walter; Reiss Guido J; Ganter Christian^*

来源：Organometallics, 2010, 29(20): 4418-4420.

DOI：10.1021/om100728n

The preparation of the novel N-heterocyclic carbene ligand 3 based on an oxalamide backbone is described. Carbene 3 is not stable as a monomeric species at ambient temperature but dimerizes to the olefin 4 in the absence of trapping reagents. Carbene 3 reacts with elemental sulfur, tert-butylisocyanide, or [M(COD)Cl](2) (M = Rh, Ir) to give thione 5, ketenimine 6, or complexes [(3)M(COD)Cl] (7), respectively. The dicarbonyl complexes [(3)M(CO)(2)Cl] (8) (M = Rh, Ir) show high-energy CO vibrations. The carbene ligand 3 behaves as a remarkably poor net electron donor compared to other NHC ligands.

• 出版日期2010-10-25