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α-Dicationic Chelating Phosphines: Synthesis and Application to the Hydroarylation of Dienes

MPS-Authors
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Gu,  Lianghu
Research Group Alcarazo, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Wolf,  Lawrence M.
Research Department Thiel, Max-Planck-Institut für Kohlenforschung, Max Planck Society;
Department of Chemistry, University of Massachusetts Lowel;

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Thiel,  Walter
Research Department Thiel, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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ja7b01441_si_009.pdf
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Citation

Gu, L., Wolf, L. M., Zieliński, A., Thiel, W., & Alcarazo, M. (2017). α-Dicationic Chelating Phosphines: Synthesis and Application to the Hydroarylation of Dienes. Journal of the American Chemical Society, 139(13), 4948-4953. doi:10.1021/jacs.7b01441.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-175D-2
Abstract
A series of new P^P-chelating ligands constituted by a dicationic −[P(H2Im)2]+2 unit (H2Im = 1,3-dimethyl-4,5-dihydroimidazol-2-ylidene) and a −PPh2 group connected through structurally different backbones have been synthesized. Evaluation of their reactivity toward different metal centers provides evidence that the dicationic fragment, otherwise reluctant to coordinate metals, readily participates in the formation of chelates when embedded into such a scaffold. Moreover, it significantly enhances the Lewis acidity of the metals to which it coordinates. This property has been used to develop a Rh catalyst that efficiently triggers the hydroarylation of dienes with electron-rich aromatic molecules. Kinetic studies and deuterium-labeling experiments, as well as density functional theory calculations, were performed in order to rationalize these findings.