Redox-Active Ligand-Mediated Oxidative Addition and Reductive Elimination at Square Planar Cobalt(III): Multielectron Reactions for Cross-Coupling

Journal of the American Chemical Society - Tập 132 Số 41 - Trang 14358-14360 - 2010
Aubrey L. Smith1, Kenneth I. Hardcastle1, Jake D. Soper1
1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, and X-ray Crystallography Center, Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322

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The slow reaction of [CoIII(apPh)2]−with PhCH2X likely further highlights the sensitivity of the reaction to steric hindrance.

Reactions with haloalkanes that are probes of radical intermediates (e.g., (bromomethyl)cyclopropane) were inconclusive because the1H NMR spectrum of the organometallic alkylcobalt(III) products are broadened by trace quantities of theS=1/2CoIII(apAr)(isqAr) decomposition product.

The speciation of reduced cobalt complex is concentration dependent. [CoIII(apPh)2]−reacts rapidly with PhZnBr to form an equilibrium adduct that we tentatively formulate as [CoIII(Ph)(apPh)2]2−.

In both reactions the balance of the cobalt-derived ethyls was not found. These may form butane, which is not quantitated by the GC-MS method used.

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