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. 2024 Feb 5;63(6):e202315381.
doi: 10.1002/anie.202315381. Epub 2024 Jan 4.

Counterion Effect in Cobaltate-Catalyzed Alkene Hydrogenation

Martin Gawron  1 , Franziska Gilch  1 , Daniel Schmidhuber  2 , John A Kelly  1 , Thomas M Horsley Downie  1 , Axel Jacobi von Wangelin  3 , Julia Rehbein  2 , Robert Wolf  1
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Free article

Counterion Effect in Cobaltate-Catalyzed Alkene Hydrogenation

Martin Gawron et al. Angew Chem Int Ed Engl. .
Free article

Abstract

We show that countercations exert a remarkable influence on the ability of anionic cobaltate salts to catalyze challenging alkene hydrogenations. An evaluation of the catalytic properties of [Cat][Co(η4 -cod)2 ] (Cat=K (1), Na (2), Li (3), (Dep nacnac)Mg (4), and N(n Bu)4 (5); cod=1,5-cyclooctadiene, Dep nacnac={2,6-Et2 C6 H3 NC(CH3 )}2 CH)]) demonstrated that the lithium salt 3 and magnesium salt 4 drastically outperform the other catalysts. Complex 4 was the most active catalyst, which readily promotes the hydrogenation of highly congested alkenes under mild conditions. A plausible catalytic mechanism is proposed based on density functional theory (DFT) investigations. Furthermore, combined molecular dynamics (MD) simulation and DFT studies were used to examine the turnover-limiting migratory insertion step. The results of these studies suggest an active co-catalytic role of the counterion in the hydrogenation reaction through the coordination to cobalt hydride intermediates.

Keywords: Alkenes; Cobalt; Homogenous Catalysis; Hydrogenation; Ion Pairing.

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References

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