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Inorganics 2018, 6(1), 27; https://doi.org/10.3390/inorganics6010027

Cationic Protic Imidazolylidene NHC Complexes of Cp*IrCl+ and Cp*RhCl+ with a Pyridyl Tether Formed at Ambient Temperature

1
Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182-1030, USA
2
Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0385, USA
*
Author to whom correspondence should be addressed.
Received: 16 January 2018 / Revised: 6 February 2018 / Accepted: 7 February 2018 / Published: 14 February 2018
(This article belongs to the Special Issue N-Heterocyclic Carbene Metal Complexes: From Design to Applications)
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Abstract

Protic NHC (PNHC) complexes with N1H, N2-alkyl/aryl imidazolylidene ligands are relatively rare, and routes for their synthesis differ from what is used to make non-protic analogs. Prior work from our group and others showed that in the presence of a tethering ligand (phosphine or in one case, pyridine), CpM and Cp*M (M = Ir, Ru) PNHC complexes could be made by heating. Here, we find that the use of ionizing agents to activate [Cp*MIIICl(μ-Cl)]2 (M = Ir, Rh) allows for what we believe is unprecedented ambient temperature formation of PNHC complexes from neutral imidazoles; the product complexes are able to perform transfer hydrogenation. View Full-Text
Keywords: iridium; rhodium; silver; N-heterocyclic carbene; protic; bifunctional; metalation; transfer hydrogenation iridium; rhodium; silver; N-heterocyclic carbene; protic; bifunctional; metalation; transfer hydrogenation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Grotjahn, D.B.; Martin, J.K.; Tom, T.N.; Rheingold, A.L. Cationic Protic Imidazolylidene NHC Complexes of Cp*IrCl+ and Cp*RhCl+ with a Pyridyl Tether Formed at Ambient Temperature. Inorganics 2018, 6, 27.

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