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Accessing the CpArNi(I) Synthon: Reactions with N-Heterocyclic Carbenes, TEMPO, Sulfur, and Selenium

Chakraborty, Uttam ; Urban, Franziska ; Mühldorf, Bernd ; Rebreyend, Christophe ; de Bruin, Bas ; van Velzen, Niels ; Harder, Sjoerd ; Wolf, Robert



Abstract

A reactive "(CpNiI)-Ni-Ar" surrogate (Cp-Ar = C-5(C6H4-4-Et)(5)) is accessible via the reduction of the dimer [(CpNi)-Ni-Ar(mu-Br)](2) with two equivalents of KC8. A trapping reaction with TEMPO afforded the new nickel(II) complex [(CpNi)-Ni-Ar(eta(2)-TEMPO)] (3), while the addition of N-heterocyclic carbenes gave the new nickel(I) radicals [(CpNi)-Ni-Ar(IPr)] (4a, IPr = ...

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