1. Technische Universit?t Berlin, Institute of Chemistry: Metalorganics and Inorganic Materials, Strasse des 17. Juni 135, 10623 Berlin (Germany), Fax: (+49)?30‐314‐29732, http://www.driess.tu‐berlin.de;2. Max‐Planck‐Institut für Bioanorganische Chemie, Stiftstrasse 34–36, 45470 Mülheim/Ruhr (Germany)
Abstract:
The right mix does the trick : Elusive {Ni0(η6‐arene)} moieties can be dramatically stabilized by the N‐heterocyclic silylene ligand 1 , which has a zwitterionic mesomeric structure. The σ, π‐acid–base synergism between nickel and 1 explains the unexpectedly high stability of the new silylene complexes 2 , which enables arene exchange studies at a Ni0 center. Addition of B(C6F5)3 to 2 affords the zwitterionic silylene complex 3 (see scheme, R=2,6‐iPr2C6H3).
