A 1,2-Addition Pathway for C(sp2 )-H Activation at a Dinickel Imide
Ian G Powers1, Cholpisit Kiattisewee1, Kimberly C Mullane2
1Department of Chemistry, Purdue University, 560 Oval Dr., West Lafayette, IN, 47907, USA.
Abstract:
A dinickel imido complex was synthesized using a redox-active naphthyridine-diimine supporting ligand. Upon coordination of an external ligand, the Ni2 core was disrupted, triggering an aromatic C-H activation reaction to generate a Ni2 (μ-NHAr)(Ar) species. This intermediate is capable of liberating free carbazole and phenanthridine products upon heating or treatment with excess tBuNC. Collectively, these studies establish a kinetically facile 1,2-addition mechanism for C(sp2 )-H activation, taking advantage of cooperative reactivity between two Ni centers.
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