Synthesis and reactivity of copper(i) complexes containing a bis(imidazolin-2-imine) pincer ligand

Synthesis of Binucleating Macrocycles and Their Nickel(II) Hydroxo- and Cyano-Bridged Complexes with Divalent Ions: Anatomical Variation of Ligand Features

“…22-25 Only one four-coordinate η 1 -bicarbonate complex, also a pincer species, has been previously characterized. 26,27 It and 8 crystallize as centrosymmetric hydrogen-bonded dimers. The long Cu-O4 distance of 2.542 Å is consistent with a four-coordinate description of 8 .…”

Rare Earth and Alkaline Earth Metal Complexes with Me2Si‐Bridged Cyclopentadienyl‐Imidazolin‐2‐Imine Ligands and Their Use as Constrained‐Geometry Hydroamination Catalysts

“…Substrates 6a, 7a, and 8a, bearing bulky geminal substituents in the β-position to the amino group (Thorpe-Ingold effect), could be cyclized within a few minutes (entries 1-3 and 4-6). [38] By using less bulky substituents in the β-positions, significantly lower rates are observed for all catalysts (entries [10][11][12] …”

“…[9][10][11][12] For instance, the unusual stability of coordinatively unsaturated 16-electron ruthenium and molybdenum halfsandwich complexes supported by ethylene-bridged bis-(imidazolin-2-imine) ligands can be ascribed to the strongly π-basic nature of the novel bidentate ligands, [10] which also holds true for the high reactivity of copper(I) bis(imidazolin-2-imine) complexes and allows for effective CO 2 and O 2 fixation, C-Cl bond activation and Cu I disproportionation. [11] Recently, the pronounced electron donor properties of these ligands have also been demonstrated by the synthesis and structural characterization of lanthanide complexes containing a bis(imidazolin-2-imino)pyridine pincer ligand, which confirms that the imine moieties act as ylidic amidotype ligands upon metal complexation. [12] In a similar fashion, tethering of an imidazolin-2-imine unit to a cyclopentadienyl ring through a Me 2 Si bridge leads to cyclopentadienyl-imidazolin-2-imine ligands, which can be expected to form functional "constrained-geometry" ansa-cyclopentadienyl-amido complexes, despite the overall neutral charge of the imine moiety.…”

16‐Electron (Arene)ruthenium Complexes with Superbasic Bis(imidazolin‐2‐imine) Ligands and Their Use in Catalytic Transfer Hydrogenation

“…[9] The pronounced electron-donor properties of these bis-(imidazolin-2-imines) were documented by the preparation of highly reactive copper(I) complexes, allowing effective O=O and C-Cl bond activation, CO 2 fixation and Cu I disproportionation. [7,12] Furthermore, it was shown that the unusual stability of coordinatively unsaturated 16- …”