Das 1,3‐Bis(tricyanoboran)imidazolin‐2‐ylidenat‐Anion – Ein ditopischer dianionischer N‐heterocyclischer Carben‐Ligand
Angewandte Chemie ; doi:10.1002/ange.202105529
Abstract: The 1,3‐bis(tricyanoborane)imidazolate anion 1 w as obtained in high yield from lithium imidazolate and B(CN) 3 ‐pyridine adduct . Anion 1 is chemically very robust and thus allowed the isolation of the corresponding H 5 O 2 + salt. Furthermore, monoanion 1 served as starting species for the novel dianionic N‐heterocyclic carbene, 1,3‑bis(tricyanoborane)imidazoline‐2‐ylidenate anion 3 that acts as ditopic ligand via the carbene center and the cyano groups at boron. First reactions of this new NHC 3 with methyl iodide, elemental selenium, and [Ni(CO) 4 ] led to the methylated imidazolate ion 4 , the dianionic selenium adduct 5 , and the dianionic nickel tricarbonyl complex 6 . These NHC derivatives provide a first insight into the electronic and steric properties of the dianionic NHC 3 . Especially the combination of properties such as double negative charge, different coordination sites, large buried volume and good s ‐donor and p ‐acceptor ability make NHC 3 a unique and promising liga nd and building block.
Keywords: N-heterocyclic carbene / anionic carbene / boron / cyanoborate / imidazolate
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