title: Stable Di- and Tri-coordinated Carbon(II) Supported by an Electron-Rich β-Diketiminate Ligand.
abstract: Complexes of the ubiquitous β-diketiminates (NacNac) ligands have been reported with most elements of the periodic table, including Group 14 Si, Ge, Sn, and Pb. The striking absence of carbon representatives has been attributed to the extreme electrophilicity of the putative C-NacNac adducts. An electron enriched 2,4-(dimethylamino)diketiminato backbone is described, which allowed for the synthesis and isolation of such stable pyrimidin-1,3-diium and pyrimidinium-2-ylidene salts. Structural and preliminary reactivity studies are reported, including an air-stable gold complex. An unforeseen original class of stable N-heterocyclic carbenes and, more generally, the potential of electron-rich NacNac patterns for taming highly electrophilic centers are showcased.
authors.affiliation: UMR CNRS 5250, Département de Chimie Moléculaire, Université Grenoble-Alpes, B. P. 53, 38041, Grenoble, France.
authors.forename: Vianney
authors.initials: V
authors.lastname: Regnier
authors.affiliation: UMR CNRS 5250, Département de Chimie Moléculaire, Université Grenoble-Alpes, B. P. 53, 38041, Grenoble, France.
authors.forename: Yoan
authors.initials: Y
authors.lastname: Planet
authors.affiliation: UCSD Crystallography Facility, La Jolla, CA, 92093-0343, USA.
authors.forename: Curtis E
authors.initials: CE
authors.lastname: Moore
authors.affiliation: CEA, DRF-INAC-SyMMES, 17 Rue des Martyrs, 38054, Grenoble, France.
authors.forename: Jacques
authors.initials: J
authors.lastname: Pecaut
authors.affiliation: UMR CNRS 5250, Département de Chimie Moléculaire, Université Grenoble-Alpes, B. P. 53, 38041, Grenoble, France.
authors.forename: Christian
authors.initials: C
authors.lastname: Philouze
authors.affiliation: UMR CNRS 5250, Département de Chimie Moléculaire, Université Grenoble-Alpes, B. P. 53, 38041, Grenoble, France.
authors.forename: David
authors.identifier: 0000-0002-3257-9876
authors.initials: D
authors.lastname: Martin
keywords: Group 14 elements; NacNac ligands; carbenes; carbocations